毛细管内R410A两相流动阻力特性实验研究

doi:10.19784/j.cnki.issn1672-0172.2020.06.014

Abstract

Abstract: Capillaries are widely used in the shunt flow regulation of indoor and outdoor heat exchangers of split air conditioners and multi-split air conditioning (heat pump) units. Accurate prediction of the pressure drop characteristics of two-phase flow refrigerants in capillary tubes is the key to quickly realize shunt capillary matching of heat exchangers. Propose. a method for calculating the friction resistance factor of two-phase flow in capillary tube under the condition of variable density based on approximate integral is proposed, and the effect of capillary diameter on the friction resistance factor of R410a refrigerant in capillary tube is studied experimentally. The results show that the friction resistance factor of the two-phase flow in the capillary tube decreases with the increase of the refrigerant Re number, which is consistent with the trend predicted by the classical Churchill model, but its value is more than twice that of the Churchill model, and the friction resistance factor f of the two-phase flow in the capillary tube decreases with the decrease of the inner diameter of the capillary tube.

Key words: R410A, Capillary tube, Two phase, Pressure drop, Experiment

CLC Number:

TB657.2

REN Tao, XIAO Chengjin, LIU Jiangbin, CHAI Ting, MENG Qingliang, SONG Qiang. Experimental investigation on the R410A two phase pressure drop in capillary tubes[J]. Journal of Appliance Science & Technology, 2020, 0(6): 82-85.

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Experimental investigation on the R410A two phase pressure drop in capillary tubes

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