The microbubble behavior on platinum microheaters immersed in parallel microchannels during flow boiling was experimentally investigated,with the heater driven by pulse-heating.With increasing heat flux of rear face heater,three representative types of microbubbles,corresponding to three instable tendencies were identified.The relations between boiling instability and bubbles behavior were analyzed.The conclusions indicated that transitions among these bubbles and various departure modes strongly depended on the instability of flow boiling in microchannels.Meanwhile,heating power of the rear face heater was also one of the main factors that affected bubbles incipience and diameters.The results of present study can provide powerful basis for the future design of new micro-fluid functional devices.
