Acoustically controlled bubble nucleation

Matthew T. Hughes

doi:10.1016/j.applthermaleng.2024.124466

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Acoustically controlled bubble nucleation

2024-12-01

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Matthew T. Hughes

Matteo Bucci *

DOI：10.1016/j.applthermaleng.2024.124466

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Abstract

En 中文

Fundamental studies of single bubble heat transfer are crucial to improve our understanding of boiling phenomena and develop modeling and simulation tools for the design and optimization of boiling systems. However, conducting these kinds of experiments over a wide range of conditions is challenging and may involve expensive and complicated experimental techniques (e.g., lasers) to isolate and control bubble nucleation. In this work, we introduce a new technique to control nucleation with an ultrasonic beam. A low-cost and widely available piezoelectric disc driven at megahertz frequencies directed at a heated surface can increase the time-averaged pressure and suppress evaporation until the moment the transducer is turned off, allowing us to control the incipience of boiling to within 150 mu s. We demonstrate this technique by measuring the physical and thermal footprint of natural and acoustically controlled bubbles with high-resolution infrared thermometry and phase detection diagnostics. We were able to raise the bubble nucleation temperature by over 30 K compared to a reference case with no acoustic control, which significantly changes bubble growth rate, microlayer formation and evaporation and departure diameter. We highlight the potential of this new lowcost and easy-to-use technique in a variety of different boiling heat transfer studies.

Keywords:

BOILING HEAT-TRANSFER

PREDICTION

PHYSICS

WATER

CHF