Enhancement of bubble formation and heat removal in transient boiling

For effective cooling of rapid transient and large heat load with the boiling heat transfer, it is indispensable that the wall superheat in the transient nucleate boiling region is kept as low as that in the stationary one and the transient boiling heat removal is enhanced as well as possible. The enhancement of bubble formation and heat removal in the transient boiling has been investigated by changing the number density of pinholes on the heater surface. It has been confirmed that the transient boiling characteristics are stabilized, so that the wall temperature overshoot at boiling incipience is reduced remarkably as the pinhole density increases. Moreover, it has been found that there exists an optimum pinhole density for the transient boiling heat removal