Study of acoustic emission due to vaporisation of superheated droplets at higher pressure

TL;DR

This study investigates how increasing pressure affects acoustic emissions during vaporization of superheated droplets, revealing decreased signal amplitude and frequency, which impacts bubble detection at higher pressures.

Contribution

It provides new insights into how ambient pressure influences acoustic signals during superheated droplet vaporization, highlighting the microbubble growth dynamics involved.

Findings

Acoustic emission amplitude decreases with pressure.

Primary harmonic frequency decreases with pressure.

Detection of bubble nucleation is limited at higher pressures.

Abstract

The bubble nucleation in superheated liquid can be controlled by adjusting the ambient pressure and temperature. At higher pressure the threshold energy for bubble nucleation increases and we have observed that the amplitude of the acoustic emission during vaporisation of superheated droplet decreases with increase in pressure at any given temperature. Other acoustic parameters such as the primary harmonic frequency and the decay time constant of the acoustic signal also decrease with increase in pressure. It is independent of the type of superheated liquid. The decrease in signal amplitude limits the detection of bubble nucleation at higher pressure. This effect is explained by the microbubble growth dynamics in superheated liquid.