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Choked Flow and Heat Transfer of Rarefied Gas in a Narrow Parallel-Plate Channel (Case of Uniform Heat Flux Wall)

机译:狭窄的平行平板通道中稀有气体的Flow流和传热(均匀热流壁情况)

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摘要

The characteristics of discharge and heat transfer of the continuum and slip choked flows through a narrow parallel-plate channel with uniform heat flux wall are studied by means of experiment, numerical simulation and analytical solution. The numerical results of the discharge coefficient C_d and wall surface temperature distributions agree with the experimental data. The decrease of C_d caused by the heating effect can be correlated with the dimensionless heat input. The analytical expressions of the Nusselt numbers for the developed incompressible slip flow including the viscous-heating are obtained. The Nusselt number based on the adiabatic wall temperature cooperated with the increase of local total temperature for heated wall is proposed, which is free of the viscous heating effect and proved to be consistent with the common Nusselt number for low speed internal flow.
机译:通过实验,数值模拟和解析解的方法研究了连续流和滑cho流过均匀热流壁的狭窄平行板通道的排放和传热特性。放电系数C_d和壁面温度分布的数值结果与实验数据吻合。由热效应引起的C_d的降低可以与无量纲的热输入相关。得到了包括粘性加热在内的不可压缩滑动流的努塞尔数的解析表达式。提出了基于绝热壁温的Nusselt值与局部壁温的升高共同作用的Nusselt值,其没有粘性加热作用,并且与低速内部流动的通用Nusselt值一致。

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