Study on flow boiling heat transfer in microchannel under synergistic effects of phase separation structure and electric fields
In order to study the flow boiling heat transfer characteristics in microchannels under synergistic effects of phase separation structure and electric fields,30%glycerol aqueous solution was used as the working fluid under conditions of inlet temperature 70℃,mass flow rate 121.25 kg·m-2·s-1,heat flow density 90.31-151.23 kW·m-2 and non-uniform electric fields of 0,800 and 1600 V.Flow boiling tests were carried out in countercurrent microchannels with different phase separation structures(cross-section of 2 mm×2 mm)to study local saturated boiling heat transfer coefficients and mechanism under the synergistic effect of electric fields and phase separation structures.The change of length diameter ratios of confined bubbles and the strengthening mechanism based on the visual results under the synergistic effects were analyzed.The average heat transfer performance evaluation index was used to evaluate the heat transfer performance of microchannels under the synergetic effect.The results show that compared with the non electric field and non phase separation structure,the maximum local saturated boiling heat transfer coefficient and the maximum change ratio of the length diameter ratio of confined bubbles per unit time ζ increased by 61.22%and 605.5%respectively,the average comprehensive performance evaluation index of heat transfer can reach 1.50.
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