ENHANCED FLOW BOILING HEAT TRANSFER OF HIGH SATURATION TEMPERATURE ORGANIC FLUID IN VERTICAL POROUS TUBE
In the present study the experiments on enhanced flow boiling heat transfer in a vertical tube with porous coated surface were carried out with high saturation temperature organic fluid (cumene).Heat transfer coefficients and pressure drops vs.vapor quality were measured and compared to the experimental results of a smooth tube.Boiling curves at three different mass fluxes were also obtained.The range of test parameters in the test included the fluid mass flux from 391—790kg·m -2·s -1, the vapor quality from 0.09—0.58 and evaporating pressure from 0.16—0.31MPa.The correlations for heat transfer coefficients and frictional pressure drops are derived, in which the effect of fluid molecular mass was introduced.The experimental results indicated that the heat transfer coefficients of the porous tube were 1.8—3.5 times those of smooth tube and the frictional pressure drops of the porous tube were 1.1—2.9 times those of smooth tube.