日本三菱电机公司中央研究所对蒸发器管内流态进行了研究,发现管中的流态依次为波状、齿状、环状、环雾状、雾状、蒸气状,其中雾状以后传热系数显著降低,同时压降增大。管内流态可参见图1。若能设想在环雾区接旁通管,将一部分制冷剂气体直接引到蒸发器出口,则传热效果可显著改善(见图2)。三菱电机公司所作的燕发器对比试验方案如图3所示。在所作的蒸发器中加装气液分离器和截止阀,这样的试验在冷水机组和空调器中分 Japan’s Mitsubishi Electric Corporation Central Institute of the evaporator tube flow was studied and found that the flow of the tube were wavy, dentate, annular, annular mist, mist-like, steam-like, of which the heat transfer coefficient after the mist Significantly lower pressure drop increases. Tube flow can be seen in Figure 1. If it is envisaged to connect the by-pass in the zone of the annular fog and direct a portion of the refrigerant gas to the evaporator outlet, the heat transfer can be significantly improved (see Figure 2). The comparison test program of the hair dryer made by Mitsubishi Electric Corporation is shown in FIG. 3. The evaporator made in the installation of gas-liquid separator and the shut-off valve, such tests in chillers and air conditioners in points