FATIMAZOHRA Bakhti

Kara Mahdi , Bourahal Ahmed, Ziane Oussama

Conception et réalisation d’un dissipateur rotatif utilisé pour le refroidissement d'un CPU

AMOUR Aissa

Study of turbulent flow through a fan

Seghiour Chamesseddine , Diab Nidhal Chemseddine

NUMERICAL STUDY OF THE EFFECT OF USING A ROTATING TWISTED TAPE AND A NANOFLUID ON THE THERMAL PERFORMANCE OF CYLINDRICAL-PARABOLIC COLLECTOR

REBHAOUI Abdel Aziz , MEDDAH Younes

Simulation numérique d’un capteur solaire plan muni d’un collecteur équipé d’un ruban torsadé

CHERHABIL Tarek , BELFAR Abdelbassit

ETUDE NUMERIQUE DE L'AMELIORATION DU TRANSFERT THERMIQUE DANS UN CAPTEUR SOLAIR CYLINDRO-PARABOLIQUE

BOURAHAL AHMED. , ABED NASSIF ABDELWAHID

ÉTUDE D`UN CALODUC UTILISÉ POUR LE REFROIDISSEMENT D`UN COMPOSANT ÉLECTRONIQUE.

ZIANE Bochra

ETUDE D’UN ECHANGEUR DE CHALEUR AIR-SOL UTILISE POUR LE RAFRAICHISSEMENT D’UN BATIMENT

KABOUYA Ilyas abou bakr

Simulation numérique d’un écoulement dans un échangeur de chaleur à surface raclée

ABIR AMROUNE

Etude numérique des performances thermique et hydrodynamique d’un écoulement dans un tube d'échangeur de chaleur équipé d'un ruban torsadé

HAMIDI YOUSSEF , R.ZEGHLACHE SAMIR

Simulation numérique de l’échange par naturelle thermique convection Des nanofluides dans une enceinte à paroi ondullée

zeguine belgassim , moualek imane

Simulation numerique de la convection mixte dans une nouvelle conception de dissipateur rotatif utilisé pour le refroidissement d'un CPU

This study investigates the thermal and fluid dynamics performance of scraped surface heat exchangers, optimizing key operational parameters to enhance heat transfer efficiency in processing viscous fluids. Using a numerical approach, the effects of blade count, rotational speed, and mass flow rate were analyzed. Results indicate that increasing blade count improves convective heat transfer, with a four-blade configuration enhancing the Nusselt number by 44.74% over a two-blade setup at 240 rpm. Higher rotational speeds reduce outlet temperatures by intensifying fluid mixing, though diminishing returns occur at very high speeds due to shorter residence times. These findings provide valuable insights for optimizing scraped surface heat exchanger design to balance thermal performance and energy efficiency, addressing critical needs in food, pharmaceutical, and chemical industries

Citation

FATIMAZOHRA Bakhti , Belqassim Elmahdi Zerguine, , (2026-01-20), Numerical Study of 3D Thermal-flow in a Scraped Surface Heat Exchanger, Journal of Thermal Engineering, Vol:12, Issue:1, pages:2050-2077, Yildiz Technical University

Flat plate solar collectors are widely employed in applications operating at low to moderate temperatures, including domestic water heating and various industrial uses. Their thermal performance is strongly influenced by the absorber tube, through which solar energy is transmitted to the circulating fluid. Conventional designs are often limited by low convective heat transfer, which has motivated studies on geometric enhancements to improve overall efficiency. The present work examines the thermo-hydraulic characteristics of a flat plate solar air collector fitted with twisted tape inserts having various twist ratios (δ = 3, 4, 5, 6), and compares the results with a plain tube collector. Air serves as the working fluid, and simulations were carried out over a Reynolds number range of 200–2000. A three-dimensional CFD approach was employed to study critical performance characteristics, including outlet temperature, Nusselt number, friction factor, pumping power, and thermal efficiency. The results show that twisted tape collector (TTC) provide considerably greater heat transfer compared to the plain collector (PC). At Re = 1000, the Nusselt number enhancement reached 35.19%, 44.55%, 50.15%, and 54.96% for twist ratios δ = 6, 5, 4, and 3, respectively. Although this improvement is associated with increased pressure drops, the findings confirm that twisted tape inserts substantially enhance the heat transfer effectiveness of solar collectors by promoting turbulence and better fluid mixing

Citation

FATIMAZOHRA Bakhti , Mohamed Si-Ameur, , (2025-10-30), 3D Simulation of Thermo-Hydraulic Enhancement of Flat-Plate Solar Collector Equipped with Twisted Tape, International Journal of Energy Production and Management, Vol:10, Issue:3, pages:436–455, ACALDORE

This study presents a numerical investigation of mixed convective heat transfer in a heat sink equipped with circular perforated pin fins and cooled by different nanofluids. Three types of nanoparticles TiO2, Al2O3, and Cu were dispersed in water at volumetric concentrations ranging from 2% to 10%. The simulations were conducted for Reynolds numbers between 100 and 400 to ensure laminar flow conditions, with the corresponding Richardson number in the range of 1 ≤ Ri ≤ 22. The three-dimensional steady-state Navier–Stokes and energy equations were discretized using the finite volume method and solved iteratively through the SIMPLE algorithm. The results indicate a significant enhancement in heat transfer performance when nanofluids are used compared to pure water. The improvement becomes more pronounced with increasing Reynolds number and decreasing nanoparticle concentration. Among the nanofluids studied, Cu exhibited the highest average Nusselt number, followed by Al2O3 and TiO2. Although the addition of nanoparticles slightly increases both the friction factor and the required pumping power, the overall heat transfer enhancement demonstrates that nanofluids are effective coolants for improving the thermal performance of perforated pin-fin heat sinks under mixed convection conditions Keywords – Nanofluids; Mixed convection; Heat sinks; Perforated pin fin; Finite volume method ; Computational fluid dynamic;

Citation

FATIMAZOHRA Bakhti , Nafissa Moussaoui , Souad BENKHERBACHE , ,(2025-10-29), Numerical study of thermal and hydraulic behavior of nanofluids in perforated pin fin heat sinks,1st National Seminar on Structural Mechanics and Materials (SNMSM’25) M'Sila-Algeria,M'Sila-Algeria

Ce travail explore la caractérisation mécanique et micromécanique d’un biocomposite innovant à base de fibres végétales incorporées dans une matrice thermodurcissable. L’étude vise à évaluer non seulement les performances mécaniques globales du matériau, mais également les phénomènes à l’échelle microscopique qui influencent son comportement. Des essais mécaniques classiques tel que traction a permis de déterminer les propriétés structurales du composite, tandis que des analyses micromécaniques, telles que microgouttes a révélé des informations clés sur l’interface fibre/matrice, la distribution des contraintes et les mécanismes de rupture. Les résultats montrent que l’adhésion interfaciale, le traitement des fibres, ainsi que leur orientation et leur taux de renfort jouent un rôle crucial dans la performance du matériau. Ce biocomposite présente ainsi un excellent compromis entre propriétés mécaniques, légèreté et durabilité environnementale, faisant de lui une alternative prometteuse aux composites synthétiques dans des applications techniques et écoconçues. Keywords— fibre végétale; IFSS ;biocomposite; test micromécanique; l’adhésion.

Citation

Nafissa Moussaoui , FATIMAZOHRA Bakhti , ,(2025-10-29), Caractérisation mécanique et micromécanique d'un composite( fibre végétale/résine thermodurcissable),1er National Seminar on structural mechanics and materials(SNMSM'25),University of M'sila

This study investigates the numerical analysis of natural convection heat transfer in a vertical pipe with cubic obstacles, focusing on how the position and number of these obstacles affect heat transfer. Simulations were conducted with a fixed aspect ratio of A=5 and varying Rayleigh numbers ranging, from 10 to 10,000, to explore the influence of obstacle configuration on heat transfer efficiency. The study uses the finite volume method (FVM) to solve the governing equations for mass, momentum, and energy, assuming steady-state, laminar flow. The discretization of the equations is completed by using the Power Low Differencing Scheme (PLDS) for the discretization of convection terms. The algorithm SIMPLE was adopted to ensure the coupling pressure velocity, and the discretized equations obtained were solved by using the method of sweeping associated with the Thomas algorithm TDMA. Results show that the placement and number of obstacles significantly affect flow patterns and heat transfer, with more obstacles enhancing turbulence and heat exchange. However, excessive obstacles may increase pressure drop, indicating a trade-off between heat transfer and flow resistance. The findings provide insights for optimizing natural convection heat transfer systems in applications like cooling and thermal management. Keywords: natural convection, vertical duct, square ribs, numerical simulation, finite volume method.

Citation

FATIMAZOHRA Bakhti , ,(2025-09-03), Numerical study based on finite volume method of natural convection heat transfer in vertical channel with square ribs,9th International Conference of Mathematical Sciences (ICMS2025) Session Mathematical methods in physics,Istanbul –Turkey

This study conducts a 3D numerical investigation into the heat transfer performance of hybrid nanofluids flowing through the tube of a hybrid photovoltaic/thermal (PV/T) solar panel, employing Fluent 6.3.26 for the simulations. The hybrid nanofluids consist of CuO-Cu/water and CuO-Al2O3 /water suspensions, with their properties varying based on the type, size, and concentration of nanoparticles. The analysis focuses on the Reynolds number, thermal efficiency, and the temperature distribution across the PV/T components as the primary dependent variables.

Citation

Souad BENKHERBACHE , FATIMAZOHRA Bakhti , Nafissa Moussaoui , ,(2025-05-12), 3D Numerical Study of Heat Transfer Enhancement in a Hybrid PV/T Solar Panel Using CuO-Cu/Water and CuO-Al2O3 /Water Nanofluids,FIRST INTERNATIONAL CONFERENCE ON GREEN ENGINEERING,MOHAMED EL BACHIR EL IBRAHIMI UNIVERSITY OF BORDJ BOU ARRERIDJ, ALGERIA

Cylindro-Parabolic Collector (CPC) is essential in concentrated solar power (CSP) systems, and improving its thermal efficiency is a key research focus. This study explores the combined effects of modifying the absorber tube geometry and using advanced heat transfer fluids on CPC performance. The absorber tube incorporates twisted tape inserts, acting as turbulators to increase fluid turbulence and enhance heat transfer. Two heat transfer fluids are tested: Syltherm800, a synthetic fluid, and Syltherm800+Al2O3, a nanofluid enhanced with Al2O3 nanoparticles (2%-8%) to improve thermal conductivity. The performance of CPCs with twisted tape (CTT) is compared to a plain collector tube (PC). Results show that the twisted tape, combined with Syltherm 800+Al2O3, significantly enhances heat transfer and thermal efficiency. The twisted tape improves turbulence, and the nanofluid increases the fluid's thermal conductivity. These modifications lead to higher outlet temperatures and better overall performance. The findings demonstrate that optimizing both absorber tube geometry and heat transfer fluids can significantly improve CPC thermal efficiency, contributing to more effective solar energy harvesting.

Citation

FATIMAZOHRA Bakhti , Nafissa Moussaoui , Souad BENKHERBACHE , ,(2025-05-12), Thermal efficiency improvement of a cylindrical-parabolic collector with Syltherm 800/Al2O3 nanofluid,The First International Conference on Green Engineering (ICGE-25),Bordj Bou Arreridj-Algeria

This study examines how the thickness of gallium arsenide (GaAs) thin films influences the photovoltaic performance of amorphous silicon (a-Si)-based heterojunction solar cells using numerical simulations conducted with AMPS-1D software. The GaAs film thickness was systematically varied between 25 nm and 100 nm to determine the optimal configuration for maximum efficiency. The device architecture consists of an amorphous silicon absorber layer (a-Si(p)) at an optimal thickness of 2500 nm, an amorphous silicon buffer layer (a-Si(n)) fixed at 50 nm, and a zinc oxide (ZnO) transparent conductive window layer of 25 nm thickness. Critical performance metrics, including fill factor (FF), conversion efficiency (η), short-circuit current density (Jsc), and open-circuit voltage (Voc), were analyzed to evaluate the cell's performance. The simulation results demonstrated that adjusting the GaAs film thickness significantly influenced the device parameters, identifying an optimal thickness of 100 nm, which gave us the best efficiency by effectively balancing enhanced current generation with minimized voltage losses. After optimization, the device achieved Voc = 0.78 V, Jsc = 37.88 mA/cm², FF = 0.85, and an efficiency (η) of 25.33%. The optimization considered variations in both temperature and wavelength, underscoring the importance of GaAs film thickness in achieving optimal photovoltaic performance and providing valuable insights for the development of advanced heterojunction solar cells. Keywords— a solar cells; GaAs; heterojunction; a-Si; AMPS-1D; thickness.

Citation

Nafissa Moussaoui , FATIMAZOHRA Bakhti , Souad BENKHERBACHE , ,(2025-05-12), Effect of GaAs thin film thickness on the performance of a (a-Si)-based heterojunction solar cell by simulation,the first international conférence on Green Engineering (IGGE-25),Bordj Bou Arreridj

The plate solar collector is a widely utilized technology for capturing solar energy to heat fluids in low to medium-temperature applications such as domestic water heating and industrial processes. A key component in improving thermal efficiency is the absorber tube, where the heat transfer from solar radiation to the working fluid takes place. Research efforts focus on enhancing heat transfer by geometrically modifying the absorber tube. This study examines the hydrothermal performance of a flat plate solar collector equipped with twisted tape turbulators at various twist ratios (δ = 3, 4, 5, 6), compared to a plain tube collector. The analysis, which uses air as the working fluid, explores the effect of Reynolds number (Re = 200–2000) on performance metrics such as heat transfer, friction factor, and pumping power. The numerical results reveal that the collector with twisted tape (CTT) outperforms the plain collector (CP). Both the Nusselt number and pressure drop are higher in the CTT compared to the CP. For a Reynolds number of Re=1000, the twisted tape enhances the Nusselt number by 35.19%, 44.89%, 50.15%, and 54.96% at twist ratios δ = 6, 5, 4, and 3, respectively. Keywords— Flate plate solar collector, Thermal performance, Twisted tape, Heat transfer.

Citation

Souad BENKHERBACHE , FATIMAZOHRA Bakhti , Nafissa Moussaoui , ,(2025-05-06), Thermal Performance Analysis of a Flat-Plate Solar Collector,The First lrlational Conference on Renewable Energies and Advanced Electrical Engineering (NC REAEE'zS),University of M'sila

The increasing use of solar cells as energy converters necessitates a deeper understanding of these systems to optimize and enhance the utilization of this promising energy source. This study aims to numerically simulate the impact of temperature variations between 270 K and 340 K on the performance of solar cells. Specifically, it examines how temperature affects key parameters, including the fill factor (FF), open-circuit voltage (Voc), short-circuit current density (Jsc), and efficiency (ɳ), in a double-junction solar cell structure (ZnO / GaAs (p) / a-Si (n) / a-Si (p)) with layer thicknesses of 25, 100, 50, and 2500 nm, under a constant irradiance of 1000 W/m². This research was made possible using the advanced AMPS-1D (Analysis of One-Dimensional Microelectronic and Photonic Structures) simulation tool, which enables us to connect the performance characteristics of the solar cell with the material properties and manufacturing processes. After optimization, the results for the double-junction cell showed a short-circuit current density (Jsc) of 37.755 mA/cm², an open-circuit voltage (Voc) of 0.789 V, a fill factor (FF) of 0.862, and an efficiency (ɳ) of 25.705%. Keywords: a-Si; solar cells; GaAs; double junction; AMPS-1D; Temperature.

Citation

Nafissa Moussaoui , FATIMAZOHRA Bakhti , ,(2025-05-06), Assessment of the efficacy of double junction solar cells (GaAs/a-Si) in relation to temperature effects numerically,the first national conférence on renewable energies and advanced electrical engineering (NCREAEE'25),University of M'sila

Abstract The aim of this study is to examine by means of three-dimensional numerical simulations the thermal-fluid features in elliptical pin fin heat sink. The passive heat transfer enhancement technique is used to comprehend and control the cooling process. This passive methodology is based on pin fins arrangement, hydrodynamic and geometrical parameters. The present numerical results are confronted with experimental measurements in open literature which used one-dimensional model to explore the thermal field. A good agreement was found especially around the optimal fins dimensions. A parametric study has been carried out to deeply analyse the three-dimensional thermal-fluid fields of the heat sink for various key parameters range such the Reynolds number (Re = 50–250) and the aspect ratio (γ=H/d=5.1-9.18). Some new observations and results are obtained thanks to numerical simulations as tool of investigation. It is shown that the fins circumferential temperature is almost uniform. Furthermore, a better cooling is obtained when the Reynolds number increases mainly when the inlet velocity u0> 0.3m/s. The most suitable value of the aspect ratio is attained for γ=8.16, which ensure an optimal cooling process of the pins. A new global Nusselt number correlation was developed for engineering applications. Keywords: Mixed convection, heat sink, elliptical pin fins, cooling device, CFD.

Citation

FATIMAZOHRA Bakhti , Mohamed Si-Ameur, ,(2024-12-13), Elliptieal Pin Fin Heat Sink: Passive Cooling Control,The International Conference on Multidisciplinary Sciences and Technological Developments (ICMUSTED 2024) Erzurum ,Turquie,Turquie

Cylindro-Parabolic Collector (CPC) is a solar energy technology known for its established role in concentrated solar power systems. Ongoing research aims to improve its thermal efficiency by exploring modifications in the geometry of the absorber tube and using innovative heat transfer fluids. The main objective of this work is to evaluate the combined effects of modifying the absorber tube geometry and using advanced heat transfer fluids on the thermal performance of CPCs. The absorber tube design incorporates twisted tape inserts, which act as turbulators to enhance heat transfer. The heat transfer fluids used include Syltherm 800, a synthetic heat transfer fluid, and Syltherm 800+Cu, a nanofluid that adds copper nanoparticles (φ=1-4% ) improved thermal properties. The performance of a collector with a twisted tape turbulator ( CTT) is compared with that of a plain collector tube (PC) by calculating the Nusselt number (Nu) and outlet temperature. The findings results indicate a significant enhancement in thermo-hydraulic performance with the twisted tape turbulator and Syltherm 800+Cu nanofluid combination. The twisted tape increases turbulence, improving heat transfer, while the nanofluid enhances the thermal conductivity of the system. Keywords: Parabolic trough collectors, Twisted tape, nanofluid, heat transfer enhancement.

Citation

FATIMAZOHRA Bakhti , ,(2024-11-20), Numerical Study of The Effect of Using Twisted Tape and a Nanofluid on The Thermal Performance Of a Cylindrical-Parabolic Collector,3ed ICMM 2024 International Conference On Materials And Mechanics Boumerdes University –Algeria,Boumerdes -Algeria

In this work, computational simulation was carried out to study the enhancement cooling process mixed convection of an electronic component (CPU mounted in a motherboard) using a new design of a heat exchanger by combining the heat sink (the finned surface) and the fan in a single component, this allows more heat to be moved faster and with less energy than a conventional cooler. Three radial heat sinks (HS18, HS24 and HS36) are considered depending on circumferential fin numbers (n = 18, 24 and 36). The effect of Reynolds number, heat flux and rotational velocity is investigated, and the optimum comprehensive performance was determined. The results reveal the cooling performance turns out to be better for heat sink with n = 36. The rotational velocity operates a significant effect on the temperature field only for values below than 900 rpm.

Citation

FATIMAZOHRA Bakhti , Mohamed Si-Ameur, Belquassem Zerguine, ,(2024-11-17), Enhanced heat transfer performance of rotating heat sink via mixed convection in cooling electronic chips,8th National Colloquium on lnductics: University-lndustry M'Sila-Algeria,M'sila -Algeria

The technological progress made in recent years has driven electronic apparatus to become not only more efficient and work faster but also considerably smaller in weight and size. Furthermore, the power densities of these devices have known an impressive increase. However, the challenge for the electronic industry is the lifetime device improvement by controlling the adequate removal of their excess heat. The use of more efficient cooling systems is, therefore, crucial in order to ensure durable device functionality. In this work, computational simulation was carried out to study the enhancement cooling process mixed convection of an electronic component (CPU mounted in a motherboard) using a new design of a heat exchanger by combining the heat sink (the finned surface) and the fan in a single component, this allows more heat to be moved faster and with less energy than a conventional cooler. Three radial heat sinks (HS18, HS24 and HS36) are considered depending on circumferential fin numbers (n = 18, 24 and 36). The effect of Reynolds number, heat flux and rotational velocity is investigated, and the optimum comprehensive performance was determined. The results reveal the cooling performance turns out to be better for heat sink with n = 36. The rotational velocity operates a significant effect on the temperature field only for values below than 900 rpm.We also found that the improvement in the Nusselt number and its percentage enhancement is intensified with increased rotational velocity and decreased with heat flux. A bigger Ω and ReΩ meant a more obvious heat transfer enhancement (NuΩ/Nu0) in the case of smaller Q, but (NuΩ/Nu0) decreased with increasing Q.

Citation

FATIMAZOHRA Bakhti , , (2022-06-24), Enhancement of the cooling by mixed convection of a CPU using a rotating heat sink: Numerical study, Proceedings of The Institution of Mechanical Engineers Part E-Journal of Process Mechanical Engineering, Vol:238, Issue:1, pages:144-157, SAGE Journals

The aim of this study is to examine by means of three-dimensional numerical simulations the thermal-fluid features in elliptical pin fin heat sink. The passive heat transfer enhancement technique is used to comprehend and control the cooling process. This passive methodology is based on pin fins arrangement, hydrodynamic and geometrical parameters. The present numerical results are confronted with experimental measurements in open literature which used one-dimensional model to explore the thermal field. A good agreement was found especially around the optimal fins dimensions. A parametric study has been carried out to deeply analyse the three-dimensional thermal-fluid fields of the heat sink for various key parameters range such the Reynolds number (Re = 50–250) and the aspect ratio (γ=H/d=5.1-9.18). Some new observations and results are obtained thanks to numerical simulations as tool of investigation. It is shown that the fins circumferential temperature is almost uniform. Furthermore, a better cooling is obtained when the Reynolds number increases mainly when the inlet velocity u0> 0.3m/s. The most suitable value of the aspect ratio is attained for γ=8.16, which ensure an optimal cooling process of the pins. A new global Nusselt number correlation was developed for engineering applications.

Citation

FATIMAZOHRA Bakhti , , (2021-10-20), Elliptical Pin Fin Heat Sink: Passive Cooling Control, International Journal of Heat and Technology, Vol:39, Issue:5, pages:1417-1429, international information and engineering technolgy association

This paper presents a numerical study on the mixed convection of nanofluids in heat sinks with perforated circular fins. Four different types of nanofluids are used as cooling fluids, which are TiO 2 , Al 2 O 3 and Cu dispersed in pure water as the base fluid. The selected volumetric concentration of nanofluids was chosen in the range (2–10)%. The Reynolds number has changed in the range of 100–400 to ensure that flow remains in the laminar regime and to have the Richardson number 1 ≤ Ri ≤ 22. To study the cooling performance of the heat sink, three-dimensional steady Navier Stokes and energy equations were discretized by the finite volume method using the power-law scheme and have been solved iteratively, using the SIMPLE algorithm. The results show that a significant improvement in heat transfer in the heat sink due to the suspension of nanoparticles in the base fluid compared to pure water, the improvement in heat transfer is intensified with increased Reynolds number and decrease in the volume fraction of nanoparticles. We also found that the low values of the average Nusselt number are obtained for the nanofluid TiO 2 , the average values for Al 2 O 3 and the highest values for Cu. It is important to note that a slight increase in friction factor and pumping power has been reported when nanofluid is used in the system.

Citation

FATIMAZOHRA Bakhti , Mohamed Si-Ameur, , (2019-05-20), A comparison of mixed convective heat transfer performance of nanofluids cooled heat sink with circular perforated pin fin, Applied Thermal Engineering, Vol:159, Issue:159, pages:113819, Elsevier

L’étude des processus de refroidissement suscite un très grand intérêt, plus particulièrement dans l’industrie électronique où la génération excessive de chaleur peut être la cause d’endommagement et de perte de matériel ou de système électronique utilisé. Améliorer le transfert convectif dans les dispositifs de refroidissement revient à intensifier l’échange thermique entre un fluide caloporteur et une surface chaude. On propose, dans ce travail, d'étudier le transfert de chaleur par convection mixte dans un dissipateur de chaleur à ailettes cylindriques perforées, les fluides caloporteurs sont l’eau et les nanofluides (eau+ TiO2 )et (eau+Cu) avec différentes fractions volumiques φ=2% - 10% et des nombres de Reynolds Re varie entre 100 et 400. Les simulations numériques ont été effectuées en utilisant le code FLUENT basé sur la méthode des volumes finis, les simulations numériques ont été réalisées pour étudier l’influence du nombre de Reynolds, la perforation dans les ailettes et le type de nanofluide sur le refroidissemnt du composant électronique. Les resultats numériques indiquent que l’ajout des perforations dans les ailettes et l’addition des nanoparticules(TiO2 et Cu) dans l’eau permet d’amélioer les performances de refroidissement du composant électronique.

Citation

FATIMAZOHRA Bakhti , ,(2018), Amélioration des performances de la convection mixte des nanofluides dans un dissipateur de chaleur à ailettes cylindriques perforées,International seminar in Industrial Engineering and Applied Mathematics,Skikda-Algérie

This present numerical study investigates on mixed convection of nanofluids in heat sink with circular perforated pin fins. Four different kinds of nanofluids are used as a cooling fluid which are TiO2, Al2O3 and Cu dispersed in pure water as a base fluid. The volumetric concentration of selected nanofluids has been chosen in range (2-10)%. The Reynolds number changed in the range of 100–400 to ensure that, the flow remains in the laminar regime and to have Richardson number 1≤Ri≤22. To investigate the cooling performance of the heat sink, three-dimensional steady Navier Stokes and energy equations were discretized by finit volume method using the power-law scheme and have been solved iteratively, using the SIMPLE algorithm. The results show that a significant enhancement of heat transfer in the heat sink due to suspension of nanoparticles in the base fluid in comparison with pure water, enhancement of heat transfer is intensified with increasing Reynolds number and decreasing volume fraction of nanoparticles. We also found that the low values of the average Nusselt number are obtained in the case of the nano fluid TiO2, the average values for Al2O3 and the largest values for Cu.

Citation

FATIMAZOHRA Bakhti , ,(2018), A comparison of mixed convective heat transfer performance of nanofluids cooled heat sink with circular perforated pin fin,4 International Conference on Advances In Mechanical Engineering IStanbul 2018,Instanbul -Turkey