Experimental study of boiling heat transfer and flow characteristics in fin channels with variable cross section

The object of this work is to investigate the boiling heat transfer performance of transverse serrated fin (TSF) channel and triangle perforated fin (TPF) channel in compact plate-fin heat exchanger. A series of boiling heat transfer performance tests are carried out for volume flow rate range of 0.03-0.3 m3/h and heat flux of 10-20 kW/m2. The local and average heat transfer coefficient of TSF channel and TPF channel are examined. It indicates that both local and average boiling heat transfer coefficient of TSF channel was higher than that of TPF channel. The boiling heat transfer occurs in TSF channel at lower wall superheat. The growth rate of wall temperature significant declines significantly when heat flux is up to ONB point, which means the boiling heat transfer has happened. The rising rate of average boiling heat transfer coefficient have is smaller than that of the local boiling heat transfer coefficient hout.