新型压缩／喷射制冷循环系统的实验研究

建立了蒸气压缩／喷射混合制冷循环的实验装置．在与原系统最优充灌量相同的条件下，测试了不同喷嘴出口直径下新循环系统的冷却速度曲线和耗电量．结果表明，在出口直径ｄ＝０．３～０．４ｍｍ内，新循环系统有节能效果．

Experimental Study of Mass Transfer for Circular Jet Impingement in a Cylinder and Diverging Conical Cavity

The mass transfer for circular jet impingement in a cylinder and a converging conical cavity with one end open to the ambient air have been experimentally investigated via naphthalence sublimation technique. It is found that with increasing of s/d j average Sherwood numbers of the bottom and the lateral surfaces increase first, reach their maximum and then decrease. The maximum Sherwood number occurs approximately at s/d j=3. The local mass transfer coefficient of the bottom surface first decreases with the increase in radius, reaches its minimum, and then rises. The local mass transfer coefficient of the lateral surface along the height exibits typical boundary layer type character.