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Characterization of liquid refrigerant R-123 flow emerging from a flooded evaporator tube bundle

机译：液体制冷剂R-123流动的液体制冷剂R-123流动的表征溢流蒸发器管束

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The distribution of liquid droplets emerging from an evaporator tube bundle is characterized for low-pressure refrigerant R-123 with a triangular tube arrangement of pitch 1.167. The purpose of this research is to improve understanding of the droplet ejection process to aid the design of evaporators typically used in larger chiller systems. A laser and camera system captured images of the evaporator headspace at varying conditions. Conventional shadowgraphy techniques were applied to recognize droplets and match droplets for velocity calculations. The evaporator conditions were varied with mass fluxes from 3.5 to 40.7 kg/s-m(2) (2550 to 30000 lb/hr-ft(2)), top rows heat fluxes from 5.3 to 31.5 kW/m(2) (1700 to 10000 Btu/hr-ft(2)), and outlet saturation temperatures of 4.4 degrees C and 12.8 degrees C (40 degrees F and 55 degrees F). Conditions ranged from flooded to dry-out on the top rows. Droplet number, size distribution, and velocity are presented. The experimentaly measured liquid volume fraction in the headspace is also presented. Liquid distribution in the headspace is found to be a strong function of all varied properties, particularly mass flux, liquid level, and saturation temperature. The high liquid-vapor density ratio of R-123 and corresponding high velocities make it particularly difficult to separate liquid droplets before they escape the tube bundle.
机译：从蒸发器管束中出现的液滴的分布特征在于具有间距1.167的三角形管布置的低压制冷剂R-123。本研究的目的是提高对液滴喷射过程的理解，以帮助通常在较大的冷却系统中使用的蒸发器的设计。激光器和相机系统在不同的条件下捕获蒸发器顶空的图像。应用传统的影像图技术来识别液滴并匹配速度计算的液滴。蒸发器条件与3.5至40.7kg / sm（2）（2550至30000磅/小时/小时（2））的质量助量变化，从5.3-3.5 kW / m（2）（1700至10000）的顶部行热通量BTU / HR-FT（2））和出口饱和度温度为4.4摄氏度和12.8摄氏度（40°F和55°F）。条件从洪水淹没在顶部行上干燥。介绍了液滴数，尺寸分布和速度。还介绍了顶空中测量的实验室测量液体体积分数。发现顶部空间中的液体分布是所有不同性质，特别是质量磁通，液位和饱和温度的强功能。 R-123的高液态蒸汽密度比和相应的高速度使得在逸出管束之前特别难以将液滴分离。

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