Abstract
The effects of the electrolytic activation of bubble nucleation on heat transfer in the saturated boiling of water were experimentally investigated. A copper heated surface is used as a cathode in the electrolysis circuit in this study. The hydrogen bubbles electrolytically generated at the heated surface are used as boiling bubble nuclei to increase the nucleation site density. This paper is the first report on the heat transfer characteristics in boiling activated by electrolysis. In the experiment, the generated hydrogen bubbles were confirmed to actually act as boiling bubble nuclei through the visualization of bubble behavior. The electrolytic supply of boiling bubble nuclei significantly enhanced the boiling heat transfer, as intended. The electrolytic boiling activation was found to be more effective at a lower heat flux with fewer bubbles at the heated wall. Finally, it was demonstrated that this method is also useful for reducing/controlling incipient boiling superheat.
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