Flow boiling heat transfer study of R-134a/R-290/R-600a mixture in 9.52 and 12.7 mm smooth horizontal tubes: Experimental investigation

Journal Article · Sun Mar 15 04:00:00 EDT 2009 · Experimental Thermal and Fluid Science

DOI:https://doi.org/10.1016/J.EXPTHERMFLUSCI.2008.11.007· OSTI ID:21151215

Raja, B; Mohan Lal, D; Saravanan, R ^[1]

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1. R and AC Division, Dept. of Mechanical Engg., College of Engineering, Guindy, Anna University, 1, Sardar Patel Road, Chennai 600 025 (India)

A detailed experimental investigation is carried out to study the flow boiling heat transfer behavior of R-134a/R-290/R-600a (91%/4.068%/4.932% by mass) refrigerant mixture in smooth horizontal tubes of diameter 9.52 and 12.7 mm. The heat transfer coefficients of the mixture are experimentally measured under varied heat flux conditions for stratified flow patterns using a coaxial counter-current heat exchanger test section. The tests are conducted for refrigerant inlet temperatures between -9 and 5 C and mass flow rates ranging from 3 to 5 g s{sup -1}. Kattan-Thome-Favrat maps are used to confirm the flow patterns for the tested conditions. The magnitude of the heat transfer coefficient with respect to flow patterns and different mechanisms of boiling are discussed. The heat transfer coefficient of the refrigerant mixture is also compared with that of R-134a for selected working conditions. The significance of nucleate boiling in the overall heat transfer process under these testing conditions is highlighted. (author)

• OSTI ID: 21151215
• Journal Information: Experimental Thermal and Fluid Science, Journal Name: Experimental Thermal and Fluid Science Journal Issue: 3 Vol. 33; ISSN 0894-1777; ISSN ETFSEO
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COUNTER CURRENT
FLOW RATE
Flow boiling
Flow patterns
HEAT EXCHANGERS
HEAT FLUX
HEAT TRANSFER
Heat transfer coefficient
MASS
MIXTURES
NUCLEATE BOILING
REFRIGERANTS
Stratified flow
TUBES