Experiment on flow resistance of n-decane in vertical tube at supercritical pressure

The flow resistance characteristics under heating condition of n-decane in the vertical miniature tube at supercritical pressure were investigated. The influence of heat flux, system pressure and inlet temperature was mainly studied. The result indicated that, the pressure drop due to frictional resistance in tube decreased with the rise of heat flux when fluid temperature was not very high. When temperature rose to the pseudocritical point, due to the effect of thermal physical properties, the pressure drop increased. And the lower system pressure led to more violent pressure drop changes. While the temperature of fluid was higher than the pseudo-critical temperature, pressure drop went up with increases of heat flux because of steady thermal physical properties. As a result, an empirical correlation of frictional resistance was derived for different temperatures and ratios of heat flux to mass velocity.