Effect of variable thermal conductivity and viscosity on single phase convective heat transfer in slip flow

被引:0
|
作者
Sadık Kakaç
Almıla G. Yazıcıoğlu
Arif Cem Gözükara
机构
[1] TOBB University of Economics and Technology,Mechanical Engineering Department
[2] Middle East Technical University,Mechanical Engineering Department
[3] ASELSAN Inc,MGEO Division
来源
Heat and Mass Transfer | 2011年 / 47卷
关键词
Nusselt Number; Viscous Dissipation; Local Nusselt Number; Entry Length; Constant Wall Temperature;
D O I
暂无
中图分类号
学科分类号
摘要
For a variety of fields in which micro-mechanical systems and electronic components are used, fluid flow and heat transfer at the microscale needs to be understood and modeled with an acceptable reliability. In general, models are prepared by making some extensions to the conventional theories by including the scaling effects that become important for microscale. Some of these effects are; axial conduction, viscous dissipation, and rarefaction. In addition to these effects, temperature variable thermal conductivity and viscosity may become important in microscale gas flows due to the high temperature gradients that may exist in the fluid. For this purpose, simultaneously developing, single phase, laminar and incompressible air flow in a microtube and in the micro gap between parallel plates is numerically analyzed. Navier–Stokes and energy equations are solved and the variation of Nusselt number along the channel is presented in tabular and graphical forms as a function of Knudsen, Peclet, and Brinkman numbers, including temperature variable thermal conductivity and viscosity.
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页码:879 / 891
页数:12
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