An experimental investigation was conducted to identify the heat transfer performanceof liquld flow boiling through microchanneled tubes. Compared with smooth tube, the flowboiling heat transfer in enhanced tubes is apparently intensified, and the wall superheat ofboiling initiation is significantly decreased. For the case of small flow rate, the boiling heattransfer coefficient of enhanced tube is 1.7 times higher than that of smooth tube.
Experiments were conducted to investigate flow boiling of subcooled water -methanol mixtures flowing through rectangular microchannels. The results show that the size of the microchannels and the flow velocity would affect the boiling initiation and the wall heat flux. Mixtures with a small concentration of methanol augmented the heat transfer, while those with larger concentration decreased the heat transfer, as compared with that of pure methonal. An optimum concentration exists for specified flow velocity.
