Flow Regimes and Transitions for Two-Phase Flow of R152a During Condensation in a Circular Minichannel

Two-phase flow regimes were experimentally investigated during the entire condensation process of refrigerant R152a in a circular glass minichannel. The inner and outer diameters of the test minichannel were 0.75 and 1.50 mm. The channel was 500 mm long to allow observation of all the two-phase flow...

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Autores principales:	Na Liu, Qian Zhao, Zhixiang Lan
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	two-phase flow condensation flow regime minichannel R152a General Works A
Acceso en línea:	https://doaj.org/article/6d110523a5514602b820c9f300999763
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spelling	oai:doaj.org-article:6d110523a5514602b820c9f3009997632021-11-12T06:12:52ZFlow Regimes and Transitions for Two-Phase Flow of R152a During Condensation in a Circular Minichannel2296-598X10.3389/fenrg.2021.792586https://doaj.org/article/6d110523a5514602b820c9f3009997632021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fenrg.2021.792586/fullhttps://doaj.org/toc/2296-598XTwo-phase flow regimes were experimentally investigated during the entire condensation process of refrigerant R152a in a circular glass minichannel. The inner and outer diameters of the test minichannel were 0.75 and 1.50 mm. The channel was 500 mm long to allow observation of all the two-phase flow regimes during the condensation process. The experiments used saturation temperatures from 30 to 50°C, a mass flux of 150 kg/(m2·s) and vapor qualities from 0 to 1. The annular, intermittent and bubbly flow regimes were observed for the experimental conditions in the study. The absence of the stratified flow regime shows that the gravitational effect is no longer dominant in the minichannel for these conditions. Vapor-liquid interfacial waves, liquid bridge formation and vapor core breakage were observed in the minichannel. Quantitative measurements of flow regime transition locations were carried out in the present study. The experiments also showed the effects of the saturation temperature and the cooling water mass flow rate on flow regime transitions. The results show that the annular flow range decreases and the intermittent and bubbly flow ranges change little with increasing saturation temperature. The cooling water mass flow rate ranging from 38.3 kg/h to 113.8 kg/h had little effect on the flow regime transitions.Na LiuQian ZhaoZhixiang LanFrontiers Media S.A.articletwo-phase flowcondensationflow regimeminichannelR152aGeneral WorksAENFrontiers in Energy Research, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	two-phase flow condensation flow regime minichannel R152a General Works A
spellingShingle	two-phase flow condensation flow regime minichannel R152a General Works A Na Liu Qian Zhao Zhixiang Lan Flow Regimes and Transitions for Two-Phase Flow of R152a During Condensation in a Circular Minichannel
description	Two-phase flow regimes were experimentally investigated during the entire condensation process of refrigerant R152a in a circular glass minichannel. The inner and outer diameters of the test minichannel were 0.75 and 1.50 mm. The channel was 500 mm long to allow observation of all the two-phase flow regimes during the condensation process. The experiments used saturation temperatures from 30 to 50°C, a mass flux of 150 kg/(m2·s) and vapor qualities from 0 to 1. The annular, intermittent and bubbly flow regimes were observed for the experimental conditions in the study. The absence of the stratified flow regime shows that the gravitational effect is no longer dominant in the minichannel for these conditions. Vapor-liquid interfacial waves, liquid bridge formation and vapor core breakage were observed in the minichannel. Quantitative measurements of flow regime transition locations were carried out in the present study. The experiments also showed the effects of the saturation temperature and the cooling water mass flow rate on flow regime transitions. The results show that the annular flow range decreases and the intermittent and bubbly flow ranges change little with increasing saturation temperature. The cooling water mass flow rate ranging from 38.3 kg/h to 113.8 kg/h had little effect on the flow regime transitions.
format	article
author	Na Liu Qian Zhao Zhixiang Lan
author_facet	Na Liu Qian Zhao Zhixiang Lan
author_sort	Na Liu
title	Flow Regimes and Transitions for Two-Phase Flow of R152a During Condensation in a Circular Minichannel
title_short	Flow Regimes and Transitions for Two-Phase Flow of R152a During Condensation in a Circular Minichannel
title_full	Flow Regimes and Transitions for Two-Phase Flow of R152a During Condensation in a Circular Minichannel
title_fullStr	Flow Regimes and Transitions for Two-Phase Flow of R152a During Condensation in a Circular Minichannel
title_full_unstemmed	Flow Regimes and Transitions for Two-Phase Flow of R152a During Condensation in a Circular Minichannel
title_sort	flow regimes and transitions for two-phase flow of r152a during condensation in a circular minichannel
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/6d110523a5514602b820c9f300999763
work_keys_str_mv	AT naliu flowregimesandtransitionsfortwophaseflowofr152aduringcondensationinacircularminichannel AT qianzhao flowregimesandtransitionsfortwophaseflowofr152aduringcondensationinacircularminichannel AT zhixianglan flowregimesandtransitionsfortwophaseflowofr152aduringcondensationinacircularminichannel
_version_	1718431175704313856

Flow Regimes and Transitions for Two-Phase Flow of R152a During Condensation in a Circular Minichannel

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