Journal
CHEMICAL ENGINEERING SCIENCE
Volume 248, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2021.117060
Keywords
Cleaning; Impinging jet; Modelling; Viscoplastic fluid; Viscous dissipation; Volume of fluid
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
- St John's College, Cambridge
- Cambridge Taiwan Trust
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Different approaches to model the cleaning of thin soil layers by impinging water jets were compared, with the fully-coupled CFD model showing better predictive capabilities despite the complexity of soil rheology. The study highlights the limitations of traditional predictive models when dealing with complex soil behavior.
Different approaches to model the cleaning of (i) very thin and (ii) thin soil layers by impinging water jets are compared to evaluate their predictive capabilities. Cleaning experiments were performed with coherent 2 mm and 3 mm diameter water jets (Re > 10,000) impinging on flat layers of an insoluble, viscoplastic petroleum jelly. The jelly exhibited creep below the yield stress and Herschel-Bulkley behaviour above it. A two-film shear-driven model for case (i) gave very poor predictive capability, partly due to the complex soil rheology. Case (ii) data were compared to modified versions of the phenomenological model of Fernandes and Wilson (2020), and a fully-coupled CFD model of the liquid and soil motion using the volume of fluid method. The modifications to the former did not improve its accuracy. The latter gave a good prediction of the initial cleaning behaviour for the case considered: the high computational cost precluded extensive testing. (c) 2021 Elsevier Ltd. All rights reserved.
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