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Data reduction of average friction factor of gas flow through adiabatic micro-channels

机译：通过绝热微通道的气体平均摩擦系数的数据减少

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摘要

This paper presents data reduction of average friction factor of gas flow through adiabatic micro channels. In the case of micro-channel gas flow at high speed, the large expansion occurs near the outlet and the pressure gradient along the length is not constant with a significant increase near the outlet. This results in flow acceleration and a decrease in gas temperature. Therefore the friction factor of micro channel gas flow should be obtained with measuring both the pressure and temperature. The data reductions on friction factors were carried out under the assumption of isothermal flow for numerous experimental and numerical studies since temperature measurement of micro-channel gas flow at high speed is quite difficult due to the measurement limitations. In the previous study, it was found that the gas temperature can be determined by the pressure under the assumption of one dimensional flow in an adiabatic channel (Fanno flow). Therefore in the present study data reduction to estimate friction factors between two relatively distant points considering the effect of a decrease in temperature is introduced with the temperature determined by the measured pressure at a specific location. The Friction factors obtained by using the present data reduction are examined with the available literature and the results are compared with empirical correlations on Moody chart. (C) 2018 Elsevier Ltd. All rights reserved.
机译：本文介绍了通过绝热微通道的气体平均摩擦因数的降低数据。在高速微通道气体流动的情况下，在出口附近会发生大的膨胀，并且沿长度方向的压力梯度不是恒定的，在出口附近会明显增加。这导致流动加速和气体温度降低。因此，应通过同时测量压力和温度来获得微通道气流的摩擦系数。由于许多测量和限制，在高速下对微通道气流进行温度测量非常困难，因此在许多实验和数值研究的假设下，均在等温流动的条件下进行了摩擦系数的数据减少。在先前的研究中，发现可以通过在绝热通道中存在一维流（范诺流）的假设下确定压力来确定气体温度。因此，在本研究中，考虑到温度降低的影响，引入减少数据来估计两个相对较远的点之间的摩擦系数，并在特定位置通过测量压力确定温度。使用现有的数据归约法获得的摩擦系数与现有文献进行了比较，并将结果与​​穆迪图上的经验相关性进行了比较。 （C）2018 Elsevier Ltd.保留所有权利。

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