エバポレータ用リブ付偏平管内の沸騰熱伝達 : 180度シャープターンをもつ場合の壁面温度分布

概要

論文の詳細を見る
Experimental investigations were made on boiling heat transfer using refrigerant-12, inside plate-fin-type evaporator tubes with a sharp 180-degree turn. The wall temperature distributions in a smooth tube and cross-ribbed tube were measured in detail. Experiments were conducted with the following conditions: (1) pressure of 0.29 MPa, (2) mass velocities of 44 to 132 kg/m^2s, (3) heat fluxes of 4.7 to 20 kW/m^2, (4) inlet quality of 0.3 to 0.85. Results show that the smooth tube has an uneven wall temperature distribution along the longitudinal and transverse directions. Wall temperatures of the near-inlet and near-outlet regions are higher than other regions. The cross-ribbed tube, contrary to the smooth tube, has however uniform wall temperature distributions along the longitudinal and transverse directions, which gives higher cooling performance and more uniform outlet air temperature.
一般社団法人日本機械学会の論文
1989-05-25