M. BAKHTI Fatimazohra

MAA

Directory of teachers

Department

Departement of MECHANICAL ENGINEERING

Research Interests

Transfert thermique : conduction, convection, rayonnement Mecaniques des fluides Methodes numériques , methode des volumes finis, CFD Logiciels de simulation AnsysFluent , Langyage de programmation Fortran Logiciels de simulation AnsysFluent , programmation Fortran

Contact Info

University of M'Sila, Algeria

Email : fatimazohra.bakhti@univ-msila.dz

On the Web:

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Recent Publications

2024-12-15

Heat and transfer

Heat and mass transfer are fundamental subjects that underpin many engineering and scientific applications. These phenomena are critical for understanding and designing systems in industries such as energy, environment, materials, and manufacturing.
This handout for the mass and heat transfer course is intended for students in the Bachelor's program in Mechanical Engineering with a specialization in Materials Engineering. It is in accordance with the official program issued by the Ministry of Higher Education and Scientific Research This document is organized into two key parts to provide an in-depth treatment of both heat and mass transfer.
Part A: Heat Transfer
This section introduces the foundational principles of heat transfer, examining the mechanisms through which thermal energy is transported in different media and conditions.
Part B: Mass Transfer
Building on the understanding of heat transfer, this part transitions to the study of mass transfer, with a strong focus on diffusion processes and their applications
Citation

M. BAKHTI Fatimazohra, (2024-12-15), "Heat and transfer", [national] University of M'sila

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2024-12-13

Elliptieal Pin Fin Heat Sink: Passive Cooling Control

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

M. BAKHTI Fatimazohra, Mohamed Si-Ameur, , (2024-12-13), "Elliptieal Pin Fin Heat Sink: Passive Cooling Control", [international] The International Conference on Multidisciplinary Sciences and Technological Developments (ICMUSTED 2024) Erzurum ,Turquie , Turquie

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2024-12-02

Heat transfer

This Course Handout serves as a comprehensive introduction to heat transfer, tailored for undergraduate mechanical engineering students specializing in mechanical construction. It adheres to the official academic curriculum and emphasizes the fundamental principles and mechanisms of heat transfer: conduction, convection, and radiation. Structured into three chapters, the course begins with a general overview of three heat transfer modes, accompanied by practical examples to simplify understanding. Subsequent chapters delve into steady-state one-dimensional conduction with detailed equations for various geometries, followed by an exploration of free and forced convection, including methods for calculating fluxes and key correlations. The final chapter addresses heat transfer by radiation, introducing black body concepts, radiative surface properties, and radiation in semi-transparent media. The course is enriched with solved exercises and appendices containing essential thermophysical data, providing students with practical tools to master theoretical concepts and apply them effectively in engineering contexts.
Citation

M. BAKHTI Fatimazohra, (2024-12-02), "Heat transfer", [national] University of M'sila

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2024-11-20

Numerical Study of The Effect of Using Twisted Tape and a Nanofluid on The Thermal Performance Of a Cylindrical-Parabolic Collector

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

M. BAKHTI Fatimazohra, (2024-11-20), "Numerical Study of The Effect of Using Twisted Tape and a Nanofluid on The Thermal Performance Of a Cylindrical-Parabolic Collector", [international] 3ed ICMM 2024 International Conference On Materials And Mechanics Boumerdes University –Algeria , Boumerdes -Algeria

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2024-11-17

Enhanced heat transfer performance of rotating heat sink via mixed convection in cooling electronic chips

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

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

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2022-06-24

Enhancement of the cooling by mixed convection of a CPU using a rotating heat sink: Numerical study

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

M. BAKHTI Fatimazohra, (2022-06-24), "Enhancement of the cooling by mixed convection of a CPU using a rotating heat sink: Numerical study", [national] Proceedings of The Institution of Mechanical Engineers Part E-Journal of Process Mechanical Engineering , SAGE Journals

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2021-10-20

Elliptical Pin Fin Heat Sink: Passive Cooling Control

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

M. BAKHTI Fatimazohra, (2021-10-20), "Elliptical Pin Fin Heat Sink: Passive Cooling Control", [national] International Journal of Heat and Technology , international information and engineering technolgy association

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2018

A comparison of mixed convective heat transfer performance of nanofluids cooled heat sink with circular perforated pin fin

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

M. BAKHTI Fatimazohra, (2018), "A comparison of mixed convective heat transfer performance of nanofluids cooled heat sink with circular perforated pin fin", [international] 4 International Conference on Advances In Mechanical Engineering IStanbul 2018 , Instanbul -Turkey

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Amélioration des performances de la convection mixte des nanofluides dans un dissipateur de chaleur à ailettes cylindriques perforées

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

M. BAKHTI Fatimazohra, (2018), "Amélioration des performances de la convection mixte des nanofluides dans un dissipateur de chaleur à ailettes cylindriques perforées", [international] International seminar in Industrial Engineering and Applied Mathematics , Skikda-Algérie

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