COMPARISON OF BUBBLE BEHAVIOR FOR DOUBLE-SIDE AND SINGLE-SIDE HEATING OF SUBCOOLED FLOW BOILING IN NARROW CHANNELS
The bubble behavior of subcooled R-12 flow boiling in the narrow channels with both double-side and single-side heating was studied experimentally.Experimental settings are: a test-section heating length of 400 mm,a cross-section of 35 mm in width and 2 mm in gap size,a mass flux of 700～1500 kg·m -2 ·s -1 ,a heat flux of 25～70 kW·m -2 and a pressure of 1.3～2.0 MPa.A comparison was made in terms of the onset of nucleate boiling(ONB)point and bubble characters with other flow pattern. The study found that with some appropriate modifications, the characteristics of double-side heating and single-side heating showed a better similarity.