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Effect of Non-Uniform Circumferential Heat Fluxes and Orientation on Microchannel Flow Boiling -- A Numerical Investigation

Research output: Contribution to conferenceAbstract

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Original languageEnglish
Publication statusPublished - Nov 2019
Event72nd Annual Meeting of the APS Division of Fluid Dynamics - Washington State Convention Center, Seattle, United States
Duration: 23 Nov 201926 Nov 2019
https://www.apsdfd2019.org/

Conference

Conference72nd Annual Meeting of the APS Division of Fluid Dynamics
CountryUnited States
CitySeattle
Period23/11/1926/11/19
Internet address

Abstract

Flow boiling in microchannels exhibits incredibly high heat transfer characteristics, which could be revolutionary for multiple industries. However, the underlying physical phenomena that cause these characteristics are not well understood, especially the 3D effects of flow boiling in non-circular channels and the influence of confinement on bubbles. In this study, single bubble growth is considered in a high aspect ratio microchannel, hydraulic diameter 909 μm and aspect ratio 10, at varying gravitational orientations with only 1 face heated. While common microchannel theory neglects gravitational effects, at large aspect ratios gravity affects the hydrothermal characteristics of the flow. In particular, if microchannels are rotated along the axial direction. Bubble behavior after nucleation and its effect on heat transfer is investigated until slug formation. This investigation found that the heat transfer characteristics of the bottom heated case are the highest. In addition, the thermofluidic interaction between two sequential slugs moving down a microchannel is also presented. The results of this study have been validated against past numerical and current experimental work, some of which is being performed at the University of Edinburgh. *ThermaSMART Project

Event

72nd Annual Meeting of the APS Division of Fluid Dynamics

23/11/1926/11/19

Seattle, United States

Event: Conference

ID: 150705204