THERMAL SCIENCE

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Investigation of flow boiling heat transfer characteristic of mixture refrigerant l-41b in a horizontal smooth tube

ABSTRACT
The saturated flow boiling heat transfer characteristics of L-41b (R1234ze(E)/R32 (27/73 mass %)) inside an 8 mm ID horizontal tube were investigated. The experiment were carried out at the saturation temperature of 10 to 20ºC with heat flux ranging from 5 to 10 kW•m-2 and mass flux ranging from 200 to 500 kg•m-2•s-1. The influence of mass flux, heat flux and quality on the heat transfer coefficients were examined and discussed. The experimental data of local heat transfer coefficients were compared with four well-known correlations available in literatures. Additionally, a new vapor-phase multiplier correlation to predict the local heat transfer coefficients of L-41b flow boiling inside smooth tubes was developed. The results show that the deviations of the new correlation are within -24.98% to +14.68% to the experimental data and that the 95% prediction values are within ±15%.
KEYWORDS
PAPER SUBMITTED: 2018-01-15
PAPER REVISED: 2018-05-09
PAPER ACCEPTED: 2018-05-13
PUBLISHED ONLINE: 2018-05-20
DOI REFERENCE: https://doi.org/10.2298/TSCI180115154Q
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