Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 12, 2019 - October 13, 2019
We conducted an experimental study on gas-liquid distributions of refrigerant flow in multi-pass channels with vertical headers and horizontal multiport flat tubes, which simulated parallel-flow type evaporators for air conditioners. In particular, the influence of a spraying nozzle, which was inserted in the header to improve the liquid-distribution uniformity, on the pressure loss characteristics of the channel was examined. We measured pressure losses of the channel and each branch tube, and pressure distributions in headers. The pressure loss of the nozzle amounted to 90 – 95% of the total pressure loss of the channel. The pressure loss coefficient of the nozzle could be correlated by Reynolds numbers defined with the superficial velocities of gas and liquid at the nozzle outlet.
