Abstract
We developed a boiling bubble resonator (BBR) as a new heat transfer enhancement method aided by boiling bubbles. The BBR is a passive device that operates under its own bubble pressure and therefore does not require an electrical source. In the present study, high-speed visualization of the flow motion of the microbubbles spouted from a vibration plate and the plate motion in the BBR was carried out using high-speed LED lighting and high-speed cameras; the sounds in the boiling chamber were simultaneously captured using a hydrophone. The peak point in the spectrum of the motion of the vibration plate and the peak point in the spectrum of the boiling sound were found to be matched near a critical heat-flux state. Therefore, we found that it is important to match the BBR vibration frequency to the condensation cycle of the boiling bubble as its own design specification for the BBR.
Highlights
We have previously proposed a new technique of using a boiling bubble resonator (BBR) [1,2,3] to enhance heat transfer in pool boiling without the conventional fabrication process associated with complex heat transfer surfaces [4,5,6]
Previous studies have revealed that the critical heat flux (CHF) is suppressed when an interference plate is positioned above a heat transfer surface [7,8,9]
The BBR technique developed in our previous study [1] uses the energy of the growth and collapse of boiling bubbles to excite the interference plate and enhance boiling heat transfer
Summary
We have previously proposed a new technique of using a boiling bubble resonator (BBR) [1,2,3] to enhance heat transfer in pool boiling without the conventional fabrication process associated with complex heat transfer surfaces [4,5,6]. The BBR technique developed in our previous study [1] uses the energy of the growth and collapse of boiling bubbles to excite the interference plate and enhance boiling heat transfer. In this case, the continuous exciting force applied to the interference plate, which is caused by the expansion pressure of growing boiling bubbles and condensation due to a subcooled liquid, results in self-excited vibration. These correlations are compared with the heat flux on a heat transfer surface
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