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首页> 外文期刊>International Journal of Heat and Mass Transfer >Condensation heat transfer and pressure drop of R134a in annular helicoidal pipe at different orientations
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Condensation heat transfer and pressure drop of R134a in annular helicoidal pipe at different orientations

机译：R134a在不同方向的环形螺旋管中的冷凝传热和压降

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摘要

Experimental investigations were conducted to determine the condensation heat transfer and pressure drop of refrigerant R134a in annular helicoidal pipe at three inclination angles. The experiments were performed with the Reynolds number of R134a ranging from 60 to 200, and that of cooling water from 3600 to 22000; temperatures of R134a at 30℃ and 35℃, and cooling water at 16℃, 20℃ and 24℃. The experimental results indicated that the refrigerant Nusselt number was larger at lower refrigerant saturation temperature, and would increase with the increase of mass flow rates of refrigerant and cooling water. It was found that the refrigerant heat transfer coefficient of annular helicoidal pipe could be two times larger than that of equivalent plain straight pipe when the refrigerant Reynolds number was larger than 140. Comparison with identical helicoidal pipe with opposite flow channel arrangement revealed that the refrigerant heat transfer rate was larger when the refrigerant was flowing in the annular section at the cooling water Reynolds number larger than 4000, but the pressure drop was always larger in this flow channel arrangement.
机译：进行实验研究，以确定环形螺旋管中三个倾斜角下制冷剂R134a的冷凝热传递和压降。实验进行时，R134a的雷诺数为60至200，冷却水的雷诺数为3600至22000。 R134a的温度在30℃和35℃，冷却水在16℃，20℃和24℃。实验结果表明，在较低的制冷剂饱和温度下，制冷剂的努塞尔数较大，并且随着制冷剂和冷却水质量流量的增加而增加。研究发现，当制冷剂雷诺数大于140时，环形螺旋管的制冷剂传热系数可能是等效平直管的两倍。与具有相反流道布置的相同螺旋管的比较表明，制冷剂的热量当制冷剂以大于4000的冷却水雷诺数在环形截面中流动时，传热速率较大，但是在这种流道布置中，压降始终较大。

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