Ebrahim, M, Ortega, A, Delbosc, N et al. (2 more authors) (2017) Simulation of the spreading of a gas-propelled micro-droplet upon impact on a dry surface using a lattice-Boltzmann approach. Physics of Fluids, 29 (7). 072104. ISSN 1070-6631
Abstract
Spray cooling is one of the most promising methods of cooling high heat flux electronics. Depending on the type of the nozzle, spray cooling can be categorized as single phase or two phase. In the latter, which is known to be more effective, a secondary gas is used to further pressurize the liquid and form smaller droplets at higher velocities. The gas is also assumed to assist the spreading phase by imposing normal and tangential forces on the droplet free surface which adds to the complicated hydrodynamics of the droplet impact. Moreover, the order of magnitude of droplet size in spray cooling is 10¯⁶m thereby introducing a low Weber and Reynolds numbers impact regime which heretofore has not been well understood. A 3D lattice Boltzmann method was implemented to simulate the impact of a single micro-droplet on a dry surface in both ambient air and under a stagnation gas flow. Two cases were closely compared and correlations were proposed for the instantaneous spreading diameter. Contrary to recent findings at higher impact We and Re, it was found that stagnation flow only significantly affects the spreading phase for Ca*⩾0.35 but has little influence on the receding physics.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017, the Author(s). Published by AIP Publishing. This is an author produced version of a paper accepted for publication in Physics of Fluids. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Lattice Boltzmann methods; Energy transfer; Hydrodynamics; Rheology and fluid dynamics; Thermodynamic properties |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Engineering Thermofluids, Surfaces & Interfaces (iETSI) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 14 Jun 2017 10:42 |
Last Modified: | 04 May 2020 13:55 |
Status: | Published |
Publisher: | AIP Publishing |
Identification Number: | 10.1063/1.4989546 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:117740 |