Characteristics of Pool Boiling Heat Transfer from Sintered Surfaces

This study investigated the effect of design parameters on pool boiling heat transfer on the sintered surfaces of a tube. The pool boiling experiments were conducted in saturated, deionized and degassed water. Data were taken at an atmospherical pressure and a fixed heat flux of 41,000 W/m(2). In the experimentation, the effects of the sintering pressure, sintering time, sintering temperature, heating rate, and particle size on the boiling heat-transfer coefficient of the sintered surface were investigated using the Taguchi method, and an L-15(3(5)) orthogonal array table was selected as an experimental plan for some parameters mentioned above. Based on the results of SN (signal/noise) ratio and ANOVA (Analysis of Variance), the optimal conditions of specifications of parameters will be provided. It was found that all the chosen sintering factors have significant effects on the pool boiling heat transfer coefficient. Optimum pool boiling heat transfer coefficient of 5.29 kW/m(2) K was achieved with a sintering pressure of 2 atmospheres, a sintering time of 2 hr, a sintering temperature of 900 degrees C, a heating rate of 5 degrees C/min and a particle size of 0.35 mm in a nitrogen container.