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首页> 外文期刊>International Journal of Refrigeration >A study of transcritical carbon dioxide flow through adiabatic capillary tubes
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A study of transcritical carbon dioxide flow through adiabatic capillary tubes

机译：跨临界二氧化碳流经绝热毛细管的研究

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This paper advances a study of the transcritical expansion of carbon dioxide (R-744, CO{sub}2) through adiabatic capillary tubes. The influence of both operating conditions (inlet and exit pressures, inlet temperature) and tube geometry (capillary diameter and tube length) on the CO{sub}2 mass flow rate was experimentally evaluated using a purpose-built testing facility with a strict control of the measured variables. A dimensionless correlation to predict the refrigerant mass flow rate as a function of tube geometry and operating conditions was developed. In addition, a theoretical model was put forward based on the mass, energy and momentum conservation principles. The model results were compared with experimental data, when it was found that the model predicts 95% of the measured refrigerant mass flow rate within an error band of ±10%. The model was also employed to advance the knowledge about the transcritical carbon dioxide flow through adiabatic capillary tubes.
机译：本文对通过绝热毛细管的二氧化碳（R-744，CO {sub} 2）的跨临界膨胀进行了研究。使用专门测试的设备严格控制了以下条件，以实验方式评估了工作条件（入口和出口压力，入口温度）和管道几何形状（毛细管直径和管道长度）对CO {sub} 2质量流量的影响。测量变量。建立了无因次相关性，以预测制冷剂质量流量随管子几何形状和运行条件的变化。此外，基于质量，能量和动量守恒原理，提出了一个理论模型。当发现模型预测在±10％的误差范围内测得的制冷剂质量流量的95％时，将模型结果与实验数据进行比较。该模型还被用来推进有关通过绝热毛细管的跨临界二氧化碳流量的知识。

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