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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 >Characteristics of R-123 two-phase flow through micro-scale short tube orifice for design of a small cooling system
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Characteristics of R-123 two-phase flow through micro-scale short tube orifice for design of a small cooling system

机译：R-123两相流过微型短管孔的特性，用于小型冷却系统的设计

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摘要

We present a new discharge coefficient correction method for the orifice equation for R-123 two-phase flows. In this method, an evaporator is mounted after the orifice as a vapor refrigeration cycle, and the evaporator is used to measure the quality of downstream flow through the orifice. Quality is estimated from the measured temperature and pressure of the evaporator inlet and outlet, respectively, instead of by direct measurement of quality. The condition of upstream flow of the orifice is the liquid state at 3. bar and 60°C. The liquid flow is changed to two-phase flow after passing through the orifice. Orifice diameters of 300, 350, 400, and 450 μm are used for the experiment, and the results are analyzed. Experiments are conducted for various conditions of flow rate between 20 and 70. ml/min and for cooling loads of 60, 80, and 100. W. The results show that the quality of flow downstream from the orifice can be calculated using the enthalpy difference between the inlet and outlet of the evaporator. An equation to determine the discharge coefficient is formulated as a function of quality. We expect that these results can be used to help design a small cooling system.
机译：我们为R-123两相流的孔板方程提出了一种新的排放系数校正方法。在该方法中，在孔口之后安装蒸发器以作为蒸气制冷循环，并且该蒸发器用于测量通过孔口的下游流量的质量。根据分别测量的蒸发器入口和出口的温度和压力估算质量，而不是直接测量质量。孔口上游流动的条件是在3. bar和60°C下的液态。通过孔后，液体流变为两相流。实验使用300、350、400和450μm的孔直径，并对结果进行分析。针对流量在20和70. ml / min之间的各种条件以及60、80和100. W的冷却负荷进行了实验。结果表明，可以使用焓差来计算孔口下游的流量质量。在蒸发器的入口和出口之间。确定放电系数的方程式是质量的函数。我们希望这些结果可用于帮助设计小型冷却系统。

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