冷媒の低流量域における水平蒸発管内伝熱特性に関する研究

概要

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At low mass velocities in horizontal evaporator tubes, the heat transfer coefficient is not uniform but varies extremely along the tube perimeter due to the phase separation with the liquid flowing in the lower part of the tube and the vapor in the upper part. The local heat transfer coefficient along the perimeter of the horizontal tubes for boiling R22 was investigated experimentally under the conditions of different tube diameters, pressures, mass velocities, qualities and heat fluxes. The point of separation between the wet part and the dry part of the inside perimeter of the tube was estimated from the heat transfer data, and then the averaged heat transfer coefficients over the wet part and the dry part were estimated respectively. The characteristics of the circumferentially averaged heat transfer were explained mainly by the behavior of the point of separation between the wet part and the dry part.
一般社団法人日本機械学会の論文
1988-12-25