真空下气固界面的传热

已知对于真空下的传热稀薄气体起着非常重要的作用。该文给出了稀薄气体在不同克努曾数区域下的气 -固界面间的传热表达式 ,这些表达式中包含了气体反射系数和热适应系数。文中讨论了平行平板、同轴圆柱表面和同心圆球表面的情况 ,给出了不同传热区域热流依照克努曾数倒数关系变化的数值计算结果

Heat Transfer at Gas-solid Interface Under the Condition of Vacuum

It is well-known that rarefied gas plays a very significant role in the heat transfer under the condition of vacuum. Expressions for the heat transfer fluxes at the interface of a solid surface and a gas are given for different Knudsen-nubmer regimes. There expressions contain both a gas-reflection and a thermal accommodation coefficient. In the paper, parallel-plate, coaxial-cylindrical and concentric-spherical surfaces are considered. Numerical calculations of heat flux in different heat-transfer regimes are presented in terms of the reciprocal Knudsen number.