http://depot.umc.edu.dz/handle/123456789/12290 2026-06-01T15:15:36Z http://depot.umc.edu.dz/handle/123456789/12307 دراسة إنتقال الحرارة بالحمل الحراري الطبيعي داخل نمودج سكني على شكل متوازي سطوموجه جنوبا وخاضع لدرجة حرارة ثابتة بومعيزة, نوال; لعور, صالح Pr = 0.71 نحن بصدد دراسة نقل الحرارة عن طريق الحمل الحراري الطّبیعي لمائع ذي خاصیة هواء) داخل نموذج سكني على شكل متوازي السّطوح ذو مقطع مربع أين نسّخن النّصف العلوي للوجه) الجنوبي للنّموذج ونبرّد نصف جداره السّفلي الأيمن مع عزل بقیة الجذران ولقد أختیرت هذه الوضعیة لمحاكاة وجود نافذة عند الجدار الجنوبي حیث يتعرض للإشعاع الشّمسي الدّائم والأعظمي خلال السّنة الهدف من هذا العمل هو البحث عن الرّاحة الحرارية في المنزل عن طريق تحديد معالم ممیّزة لتسخین الهواء المتحرك عن طريق الحمل الحراري الطّبیعي 2015-11-26T00:00:00Z http://depot.umc.edu.dz/handle/123456789/12306 Numerical study of laminar combined convection heat transfer of Al2O3-water nanofluid flow in a heated annular pipe BENKHEDDA, Mohamed; BOUFENDI, Toufik This study concerns the 3D flow field and heat transfer of Al2O3-water nanofluid, in an annulus. The external pipe is subjected to a uniform heat flux, while the inner cylinder is adiabatic. By using the nanofluid single phase approach and the finite volume method, the numerical simulation is carried out for a fixed radius ratio and solids concentration while the Reynolds and Grashof numbers are varied. Globally, the results show a qualitative similarity with those obtained with a base fluid alone. As expected, the mixed convection Nusselt number becomes more superior to that of the forced convection when the Grashof number is increased. With a fixed Reynolds number, the temperatures undergo a circumstantial variation under the influence of the Gr number with significant azimuthally variation and for the same concentration, temperatures within the nanofluid are strongly influenced by the Re number 2015-11-26T00:00:00Z http://depot.umc.edu.dz/handle/123456789/12305 Analyse de la convection thermosolutale dans une cavité poreuse inclinée et anisotrope SAFI, Safia; BENISSAAD, Smail Dans ce travail, le transfert combiné de chaleur et de masse par convection naturelle dans un milieu poreux incliné saturé par un fluide binaire a été étudié. Ce milieu est globalement homogène et anisotrope. Les parois verticales de la cavité sont soumises à des gradients de température et de concentration constants. Les parois horizontales sont adiabatiques et imperméables. Les équations de base décrivant la convection thermosolutale au sein de l’enceinte sont résolues par la méthode des volumes finis. L’étude a porté sur les effets de l’anisotropie en perméabilité et l’angle d’inclinaison sur les structures d’écoulement ainsi que sur les transferts de chaleur et de masse. Les résultats numériques de cette étude sont en bon accord avec ceux trouvés dans la littérature 2015-11-26T00:00:00Z http://depot.umc.edu.dz/handle/123456789/12304 Thermal development for a pseudoplastic fluid in simple duct with consideration of viscous dissipation HORIMEK, Abderrahmane; BOUGAA, Lakhdar; AIT-MESSAOUDENE, Noureddine; ABED, Saad In this work, we treat the thermal development problem, for a pseudoplastic fluid in a single pipe. A fully developed flow is supposed at the pipe inlet, with an imposed temperature at the surface in the case of a heating and cooling. In addition, the effect of viscous dissipation is considered. Finite difference method with an implicit scheme is used to solve the energy equation. The main objective of the work is to provide results, enabling to well understand the effect of viscous dissipation associated with that of rheological behavior. For this, different values of the Brinkman (Br) number characterizing the heat generation by viscous friction, and the rheological index (n) have been taken for in heating situation as well as cooling. It has been found that the fluid shear-thinning (n↓) significantly reduces the dissipative effect, by reducing the friction between the fluid layers 2015-11-26T00:00:00Z