Experimental study on saturated flow boiling heat transfer of R290/R152a binary mixtures in a horizontal tube

Abstract

An experimental study on the saturated flow boiling heat transfer for a binary mixture of R290/R152a at various compositions is conducted at pressures ranging from 0.2 to 0.4 MPa. The heat transfer coefficients are experimentally measured over mass fluxes ranging from 74.1 to 146.5 kg/(m²·s) and heat fluxes ranging from 13.1 to 65.5 kW/m². The influences of different parameters such as quality, saturation pressure, heat flux, and mass flux on the local heat transfer coefficient are discussed. Existing correlations are analyzed. The Gungor-Winterton correlation shows the best fit among experimental data for the two pure refrigerants. A modified correlation for the binary mixture is proposed based on the authors’ previous work on pool boiling heat transfer and the database obtained from this study. The result shows that the total mean deviation is 10.41% for R290/R152a mixtures, with 97.6% of the predictions falling within±30%.

Key words： flow boiling; heat transfer; binary mixture; R290/R152a

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 50890183).

Notation

Cp	specific heat/(J·kg-1·K-1)
dh	hydraulic diameter/m
E	enhancement factor
G	mass flux/(kg·m-2·s-1)
h	heat transfer coefficient/(kW·m-2·K-1)
Hlv	latent heat/(J·kg-1)
k	thermal conductivity/(W·m-1·K-1)
L	length of channel/m
M/(g·mol-1)	molecular weight
m	mass flow rate/(kg · s-1)
p	pressure/Pa
pr	reduced pressure
Pr	Prandtl number
q	heat flux/(kW·m-2)
Q	heat input/W
Re	Reynolds number
S	suppression factor
T	temperature/K
Tb	bubble point temperature/K
Td	dew point temperature/K
ΔTid	ideal temperature difference/K
ΔTdb	boiling range, defined as the temperature difference between dew point and bubble point/K
X	vapor quality
x	liquid mole fraction of more volatile component
xM	liquid composition based on mass of more volatile component
y	vapor mole fraction of more volatile component
μ	viscosity/(Pa·s)
ρ	density/(kg·m-3)
σ	surface tension/(N·m-1)
1	the more volatile component
2	the less volatile component
ave	average
exp	experiment
i	ideal
in	inlet
l	liquid
m	mixture
nb	nucleate boiling
pre	predict
sat	saturation
sp	single-phase
tp	two-phase
v	vapor
w	wall

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