Abstract
This paper experimentally investigated the flow boiling heat transfer characteristics of zeotropic mixture R1233zd(E)/R1234yf with different mass fractions (80/20, 70/30, 60/40) within an 8 mm inner diameter horizontal tube. An analysis of the impact of different experimental conditions on the flow boiling heat transfer coefficient (HTC) was conducted under different vapor quality 0–1, mass fractions 80/20, 70/30, 60/40, mass velocity 196.97–328.28 kg m−2 s−1, heat flux 35.95–48.93 kW/m−2(−|−), and saturation temperature 40–60 °C. Results indicated that the variety in the density of vapor phase components and concentration gradients within the mixture under diverse conditions exhibited a notable influence on the HTC. Using the experimental data, the accuracy of several widely used correlations for estimating the flow boiling HTC of mixture is evaluated. Considering the impact of property variations on convective boiling during flow boiling, a new correlation is proposed. The new correlation yields a higher prediction accuracy compared to other correlations, demonstrating its effectiveness in predicting the HTC of this mixture working fluid.
Published Version
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