Issue 30, 2023

Linear instability analysis of a shear thinning gelled jet with yield stress in coaxial atomization

Abstract

This study aims to experimentally and theoretically investigate the roles of a threaded nozzle and yield stress in the coaxial air blast atomization of a gelled jet by means of rheological tests and high-speed flow visualization techniques. Similar to the breakup types of Newtonian fluids, a gelled jet will gradually exhibit an oscillation mode, membrane-type breakup, fiber-type breakup and a superpulsating submode as the airflow velocity increases. The transition conditions for each type are determined and plotted in the dimensionless map of We–Oh. For the jet spray angle, the maximum occurs when We = 600 and is clearly enlarged by the gas-side thread in the nozzle. The numerical results of the linear stability analysis indicate that a smaller dominant unstable growth rate is acquired by swelling the yield stress, while the higher dominant unstable growth rate and truncated wavenumber appear as the rotational airflow is acquired through the gas-side threaded nozzle.

Graphical abstract: Linear instability analysis of a shear thinning gelled jet with yield stress in coaxial atomization

Supplementary files

Article information

Article type
Paper
Submitted
04 May 2023
Accepted
05 Jul 2023
First published
06 Jul 2023

Soft Matter, 2023,19, 5781-5794

Linear instability analysis of a shear thinning gelled jet with yield stress in coaxial atomization

Y. Wang, P. Chai, F. Yao, H. Chen, Z. Shi, H. Zhao, W. Li and H. Liu, Soft Matter, 2023, 19, 5781 DOI: 10.1039/D3SM00583F

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