Abstract
This study is devoted to complex experimental investigation of two-phase flow boiling of R134a refrigerant in a minichannel having a hydraulic diameter of 540 μm at heat fluxes up to 70 kW/m2 and mass fluxes up to 700 kg/(m2 s). Flow regimes, pressure drop, heat transfer coefficient, and behavior of instabilities are analyzed as functions of vapor quality. On the basis of experimental data, the methods for calculating two-phase pressure drop in a minichannel with a diameter of about 500 μm are determined, and new correlation is proposed for estimating the heat-transfer coefficient; the region of stable boiling of the refrigerant is also determined.
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Original Russian Text © D.M. Khovalyg, A.V. Baranenko, 2015, published in Zhurnal Tekhnicheskoi Fiziki, 2015, Vol. 85, No. 3, pp. 34–41.
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Khovalyg, D.M., Baranenko, A.V. Two-phase flow dynamics during boiling of R134a refrigerant in minichannels. Tech. Phys. 60, 350–358 (2015). https://doi.org/10.1134/S1063784215030123
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DOI: https://doi.org/10.1134/S1063784215030123