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How do the liquid properties affect the entrapment of bubbles in gas sheared liquid flows?

Sinha, Avick; Cherdantsev, Andrey; Johnson, Kathy; Vasques, Joao; Hann, David

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Authors

Avick Sinha

Andrey Cherdantsev

KATHY JOHNSON KATHY.JOHNSON@NOTTINGHAM.AC.UK
Professor of Mechanical and Aerospace Engineering

Joao Vasques

DAVID HANN DAVID.HANN@NOTTINGHAM.AC.UK
Associate Professor



Abstract

A large number of industries use fossil fuels for the purpose of cooling and lubrication utilizing a gas stream that acts as a shearing force on the liquid surface. Decreasing the carbon footprint of these processes needs an improved understanding of the effect of liquid properties. To this end this study investigates experimentally the effect of varying surface tension and liquid viscosity on the bubble generation and film statistics in a gas-sheared liquid flow. The experiments were conducted in a horizontal rectangular channel using high speed imaging in conjunction with the Brightness-Based Laser-induced Fluorescence technique (BBLIF) to measure film thickness over an area with a spatial resolution of 40 µm and a temporal resolution of 10kHz. Two butanol-water solutions were used to give reduced surface tensions (namely 0.049 N/m and 0.04 N/m) compared to our previously-studied water only value. Also, two glycerol-water solutions were chosen to yield surface tension values closer to those of an oil of interest (namely 1.4 cP and 1.9 cP). The results show that compared to water, an increase in film thickness and a decrease in the disturbance wave velocity was observed with either the reduction in the surface tension or increase in the liquid viscosity. The frequency and size of the waves were found to be dominated by the liquid surface tension. Moreover, surface tension was found to have more of an effect on aeration as compared to viscosity. The bubble velocity was found to decrease with increase in viscosity, while it increases with decrease in surface tension. It is suggested that these changes would affect heat transfer and hence should be be studied in more detail.

Citation

Sinha, A., Cherdantsev, A., Johnson, K., Vasques, J., & Hann, D. (2021). How do the liquid properties affect the entrapment of bubbles in gas sheared liquid flows?. International Journal of Heat and Fluid Flow, 92, Article 108878. https://doi.org/10.1016/j.ijheatfluidflow.2021.108878

Journal Article Type Article
Acceptance Date Oct 8, 2021
Online Publication Date Nov 8, 2021
Publication Date Dec 1, 2021
Deposit Date Aug 9, 2022
Publicly Available Date Mar 29, 2024
Journal International Journal of Heat and Fluid Flow
Print ISSN 0142-727X
Publisher Elsevier BV
Peer Reviewed Peer Reviewed
Volume 92
Article Number 108878
DOI https://doi.org/10.1016/j.ijheatfluidflow.2021.108878
Keywords Gas-sheared liquid film; Surface tension; Viscosity; Aeration; Film thickness
Public URL https://nottingham-repository.worktribe.com/output/6507863
Publisher URL https://www.sciencedirect.com/science/article/pii/S0142727X21001089
Additional Information This article is maintained by: Elsevier; Article Title: How do the liquid properties affect the entrapment of bubbles in gas sheared liquid flows?; Journal Title: International Journal of Heat and Fluid Flow; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.ijheatfluidflow.2021.108878

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