抄録
Characteristics of two-phase refrigerant flow distribution is experimentally studied in detail. The test section consists of vertical upward main tube and five horizontal evaporator tubes. All the tube has 6mm i.d. A number of tests are made under a constant mixture flow rate at the inlet of header, GH = 430 kg/m2s, ,where header inlet quality XH and total heat input Q are varied from 0.07 to 0.3,from 0 to 900 W, respectively. Experimental data indicates that there are some difference in data trend between low XH and high XH region. Athigh XH condition,i. e.,XH › 0.1, gas phase flow tends to be unevenly distributed to each pass to be the most at pass No. 3,and the variation of Q merely affects the flow distribution profiles. On the other hand, at low XH region, gas phase flow distribution is relatively equal while Q is small ;by increasing Q the flow distribution profile changes to be similar trend as that at high XH region. From these results, it is concluded that gas flow distribution is dominated by global conditions of whole system, where liquid flow is affected by local flow state in the vicinity of each junction. On the basis of this concept, a flow model is discussed and obtained correlation shows good agreement with measured data.
