Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
Journal of Enhanced Heat Transfer
Impact-faktor: 1.406 5-jähriger Impact-Faktor: 1.075 SJR: 0.287 SNIP: 0.653 CiteScore™: 1.2

ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074

Volumes:
Volumen 27, 2020 Volumen 26, 2019 Volumen 25, 2018 Volumen 24, 2017 Volumen 23, 2016 Volumen 22, 2015 Volumen 21, 2014 Volumen 20, 2013 Volumen 19, 2012 Volumen 18, 2011 Volumen 17, 2010 Volumen 16, 2009 Volumen 15, 2008 Volumen 14, 2007 Volumen 13, 2006 Volumen 12, 2005 Volumen 11, 2004 Volumen 10, 2003 Volumen 9, 2002 Volumen 8, 2001 Volumen 7, 2000 Volumen 6, 1999 Volumen 5, 1998 Volumen 4, 1997 Volumen 3, 1996 Volumen 2, 1995 Volumen 1, 1994

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v17.i1.40
pages 59-75

Two-Phase Refrigerant Distribution in a Parallel-Flow Heat Exchanger

Nae-Hyun Kim
Department of Mechanical Engineering, Incheon National University, 12-1 Songdo-Dong, Yeonsu-Gu Inchon, 22012, Korea
D. Y. Kim
Graduate School, University of Incheon, #177 Dohwa-Dong, Nam-Gu, Incheon, 402-749, Korea

ABSTRAKT

The distribution of R-134a flow is experimentally studied for a heat exchanger composed of round headers and 10 flat tubes. The effects of tube protrusion depth as well as mass flux and quality are investigated. The flow at the header inlet is stratified. The results are compared with the previous air−water results, where the flow at the header inlet is annular. For the downward flow configuration, most of the liquid flows through the frontal part of the header. The distribution of liquid improves as the protrusion depth or the mass flux increases, or the quality decreases. For the upward configuration, most of the liquid flow through rear part of the header. The liquid distribution improves as the mass flux or quality decreases. The protrusion depth has a minimal effect. Comparison of the present data on a stratified inlet flow with those of the previous annular inlet flow reveals that an inlet flow pattern has a significant effect on flow distribution. Generally, the effect of a tube protrusion depth, mass flux or quality on liquid distribution is much stronger for an annular inlet flow, probably due to a high gas velocity. Liquid distribution of the stratified inlet flow is better than that of the annular inlet flow. For the downward flow, the effect of quality on liquid distribution of the stratified inlet flow is opposite to that of the annular inlet flow. For the upward flow, the effect of the mass flux or quality of the stratified inlet flow is opposite to that of the annular inlet flow. Possible explanation is provided from the flow visualization results.


Articles with similar content:

TWO-PHASE FLOW DISTRIBUTION IN A HEADER OF A PARALLEL FLOW HEAT EXCHANGER
International Heat Transfer Conference 13, Vol.0, 2006, issue
T. Park, S. Han, Nae-Hyun Kim
EFFECT OF INLET CONFIGURATION ON DISTRIBUTION OF AIR-WATER ANNULAR FLOW IN A HEADER OF A PARALLEL FLOW HEAT EXCHANGER
Journal of Enhanced Heat Transfer, Vol.19, 2012, issue 3
H. W. Byun, Nae-Hyun Kim
AN EXPERIMENTAL AND ANALYTICAL STUDY ON CHF PHENOMENON APPEARING IN A BOTTOM-CLOSED VERTICAL TUBE FOR VAPOR/LIQUID DENSITY RATIO IN THE RANGE OF 0.000624-0.136
International Heat Transfer Conference 10, Vol.20, 1994, issue
Yoshiro Katto, K. Sugiyama , M. Fujita
PHASE DISTRIBUTION AND PRESSURE DROP OF AIR-WATER FLOWS IN A HORIZONTAL IMPACTING TEE JUNCTION
International Heat Transfer Conference 13, Vol.0, 2006, issue
A. M. F. El-Shaboury, G. E. Sims, Hassan M. Soliman
PRESSURE DROP IN A TWO-PHASE FLOW OF HELIUM UNDER ADIABATIC CONDITIONS AND WITH HEAT SUPPLY
International Heat Transfer Conference 6, Vol.1, 1978, issue
V. V. Arkhipov, V. I. Deev, Yu. V. Gordeev, A. I. Pridantsev, V. I. Petrovichev