Numerical analysis of natural convection heat transfer in a horizontal two cam shape cylinders partially filled with a fluid-saturated porous substrate
سال انتشار: 1393
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,044
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شناسه ملی سند علمی:
ISME22_215
تاریخ نمایه سازی: 14 مرداد 1393
چکیده مقاله:
In this paper natural convection heat transfer within a two- dimensional, horizontal, concentric cam shape cylinders that is partially filled with a fluid saturated porous medium has been investigated. both cylinder are maintained at constant and uni- form temperatures with the outer cylinder being subjected rel- atively lower than the inner one. In addition the forchheimer effect are taken into consideration when simulation the fluid motion inside the porous sleeve. furthermore, the local thermal equilibrium condition is take into account.the porosity is considered to be uniform and constant with ε = 0.9. the main objective of this study is to examine the effect of thermal conductivity ratio (ks/kf) and the porous sleeve thickness on the bouyancy induced flow motion under steady state condition. such an effect is studied using the following dimensionless parameters: Ra = 10^4-10^6, Da = 10^-3-10^-5. The result show that Nu number is affected most by conductivity ratio.
کلیدواژه ها:
نویسندگان
Arash M. Lavasani
Assistant Professor, Islamic Azad University Central Tehran Branch
Majid. valizade
MS student, Islamic Azad University Central Tehran Branch
Hossein. Shokouhmand
Professor, Tehran University;