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Explosion of metastable droplets in immiscible liquids

journal contribution
posted on 19.08.2021, 13:16 by Neville Rebelo, Francois NadalFrancois Nadal, Colin Garner, Huayong ZhaoHuayong Zhao
Evaporation of metastable droplets in an immiscible liquid can occur in a wide range of practical applications and in particular in cryogenic systems due to the low saturation temperature of the cryogenic liquid. In this article, we show experimentally that the incomplete explosion of a metastable droplet can lead to a ‘film evaporation’ configuration, where a remaining droplet is eventually separated from the host immiscible liquid by an established vapour layer. Based on a transient heat diffusion model, we identified that the necessary but not sufficient condition for the complete explosion of a metastable droplet is that the droplet must absorb, before explosion, an amount of heat larger than the latent heat required for a full evaporation, i.e. the global Jacob number Ja ≥ 1. In addition, the measured superheat limits of pentane and isohexane are 420.65 K and 444.95 K respectively, which are very close to the theoretical Spinodal points (≤ 1.5 K) and other reported values in existing literature. Therefore, the experimental setup reported here can be used as an alternative way to quantify the superheat limit. The Droplet relaxation time was also found scaled to the square root of the diffusion characteristic time.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

International Journal of Heat and Mass Transfer

Volume

181

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal International Journal of Heat and Mass Transfer and the definitive published version is available at https://doi.org/10.1016/j.ijheatmasstransfer.2021.121877.

Acceptance date

19/08/2021

Publication date

2021-08-29

Copyright date

2021

ISSN

0017-9310

Language

en

Depositor

Dr Huayong Zhao. Deposit date: 19 August 2021

Article number

121877

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