Abstract
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/m2s, (3) heat fluxes of 4.7 to 20 kW/m2, (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.
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