Influence of channel to heater width ratio on flow boiling critical heat flux in mini- and microchannels

Abstract

Flow boiling experiments were conducted in mini- and microchannel with different ratio of heater width to a channel width. Decrease in critical heat flux is observed in transition from wide channel to channel with width equal to a heater width. Particularities of boiling phenomena in these conditions were observed by means of high-speed visualization, which provided an explanation to heat flux reduction.

Influence of heater size on critical heat flux in flat microchannels with intense localized heating

“…The behaviour of the boiling curves is generally similar for both sizes of the heater in the entire range of water flow rates and channel heights. It is described in detail for the heater with the size of 10x10 mm 2 in [9] and compared with the case of uniform heating in [11].…”

Flow boiling of HFE-7100 in a minichannel with local heating

“…Flow boiling of water has great heat transfer characteristics and was studied well enough [2,3] for development of evaporative cooling systems but onset nucleate boiling temperature of water is not suitable for cooling of all kinds of electronic equipment. A broad range of dielectric fluids suitable for cooling of microelectronics is available in market today, among them HFE series of fluids stands out for its low toxicity and low global warming potential.…”