Analyse (CFD) de l’Ecoulement en Convection Forcée Turbulente autour des Chicanes Décalées dans un Canal Rectangulaire : Effet de Combinaison de Deux Chicanes (Plate et en Forme de V)

الموضوعات

علوم بحتة وطبيعية

الملخص

This is a numerical investigation of the performance of a new obstacle design aiming toenhance the heat transfer phenomenon in a solar air channel. A combination of two transverse, solidtypeobstacles of different shapes is used in this contribution; they are fixed to the top and bottomwalls of the channel, in a periodically staggered manner in order to develop vortices to improve themixing and consequently the heat transfer. The first obstacle to be introduced in the channel is the flatrectangular-shaped obstacle (called: simple fin); it is attached to the top hot surface, while the attackangle, height, position, and the shape of the second obstacle (called: baffle) is varied to identify theoptimum configuration for enhanced heat transfer. This is an important problem in the scope of solarair collectors where the characterization of the fluid flow, heat transfer distribution, as well as theexistence and the extension of possible recirculations need to be identified.Simulations are considered steady and the flow regime is turbulent. Air, whose Prandtl number(Pr) is 0.71, is the working fluid used, and the Reynolds numbers considered range from 12,000 to32,000. The turbulent governing equations are solved by a finite volume method with the SIMPLEdiscretization algorithm and the k-epsilon turbulence model to describe the turbulent structure. Thecomputational domain is validated through three distinct steps, namely grid independence, validationwith the numerical and experimental results and verification with the smooth rectangular air channel.In particular, streamlines; mean, axial, and transverse velocity fields; fields of dynamicpressure, turbulent kinetic energy, turbulent intensity, turbulent viscosity, and temperature;dimensionless axial velocity profiles; normalized local and average Nusselt numbers; normalizedlocal and average friction coefficients; and thermal enhancement factors are obtained at constant walltemperature condition along the top channel wall. The results of this thesis are of great significance inthe optimal design of the solar air collectors.

روابط وملفات

التعريف والنوع

رقم الوثيقة

0224c4e6-58ab-46ff-9a4c-e95c9f69f8e0

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

ماستر (LMD)

نوع الملف

pdf image

أسماء الملفات

0224c4e6-58ab-46ff-9a4c-e95c9f69f8e0_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"AZZI Ahmed ","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"MENNI Younes","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

French

المصدر والدورية

اسم المصدر

Analyse (CFD) de l’Ecoulement en Convection Forcée Turbulente autour des Chicanes Décalées dans un Canal Rectangulaire : Effet de Combinaison de Deux Chicanes (Plate et en Forme de V)

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

AZZI Ahmed

الإعداد

MENNI Younes

الاقتباسات الببليوغرافية