Experimental and analytic investigations to heat transfer

pressure drop and coke characteristics of kerosene are carried out in a square smooth small channel and 5 square small channels with different rough surface at the bottom under conditions of high heat flux

high flow rate and supercritical pressure. The characteristics of heat transfer

pressure drop and coke of kerosene and its main influence factors are revealed

and the enhanced heat transfer mechanism of rough surface and the influence of different roughness are analyzed. A comparison with smooth channel with the same size shows that the heat transfer coefficient of rough surface channel is 1.4-1.9 times of smooth channel

the friction factors is 1.3-3.8 times

and the average wall temperature of rough surface channel is markedly lower than that of smooth channel under the same conditions

thus rough surface enables to enhance the heat transfer ability of kerosene

as well as the coke heat flux.