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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Adiabatic two-phase frictional pressure drops in microchannels
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Adiabatic two-phase frictional pressure drops in microchannels

机译：微通道中的绝热两相摩擦压降

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摘要

Two-phase pressure drops were measured over a wide range of experimental test conditions in two sizes of microchannels (sight glass tubes 0.509 and 0.790 mm) for two refrigerants (R-134a and R-24517a). Similar to the classic Moody diagram in single-phase flow, three zones were distinguishable when plotting the variation of the two-phase friction factor versus the two-phase Reynolds number: a laminar regime for Re-TP < 2000, a transition regime for 2000 <= Re-TP < 8000 and a turbulent regime for Re-TP >= 8000. The laminar zone yields a much sharper gradient than in single-phase flow. The transition regime is not predicted well by any of the prediction methods for two-phase frictional pressure drops available in the literature. This is not unexpected since only a few data are available for this region in the literature and most methods ignore this regime, jumping directly from laminar to turbulent flow at Re-TP = 2000. The turbulent zone is best predicted by the Muller-Steinhagen and Heck correlation. Also, a new homogeneous two-phase frictional pressure drop has been proposed here with a limited range of application. (c) 2006 Elsevier Inc. All rights reserved.
机译：在两种尺寸的微通道（观察镜管0.509和0.790 mm）中，针对两种制冷剂（R-134a和R-24517a），在广泛的实验测试条件下测量了两相压降。与单相流中的经典穆迪图相似，在绘制两相摩擦系数与两相雷诺数的变化图时，可以区分三个区域：Re-TP <2000的层流状态，2000年的过渡状态<= Re-TP <8000，并且Re-TP的湍流状态> =8000。层流区产生的梯度比单相流大得多。对于文献中可用的任何两相摩擦压降预测方法，都无法很好地预测过渡状态。这并不出乎意料，因为在文献中只有很少的数据可用于该区域，而且大多数方法都忽略了这种情况，在Re-TP = 2000时直接从层流跃迁到湍流。相互关联。此外，在此还提出了一种新的均匀的两相摩擦压降，其应用范围有限。 （c）2006 Elsevier Inc.保留所有权利。

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