Effect of Channel Aspect Ratio on Flow Boiling Characteristics within Rectangular Micro-passages

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNConference contribution with ISSN or ISBN

Abstract

A numerical investigation on the effect of channel aspect ratio on a single bubble growth during saturated flow boiling conditions within square microchannels, is conducted in the present paper. The open-source toolbox OpenFOAM is applied for the simulations, utilising a user-enhanced Volume OF Fluid (VOF) solver. The solver enhancements include a treatment for spurious velocities dampening, the implementation of an improved dynamic contact angle sub-model for accurate prediction of wettability effects as well as the implementation of a phase-change model in the fluid domain, accounting for conjugate heat-transfer with a solid domain. It is shown that the variation of the aspect ratio of a microchannel has a significant effect in the local heat transfer coefficient, due to an enhancement of the single-phase heat transfer in combination with the alteration of the underpinned bubble growth dynamics, which result in different contributions of contact line versus liquid film evaporation.
Original languageEnglish
Title of host publicationProceedings of the World Congress on Momentum, Heat and Mass Transfer (MHMT'20)
DOIs
Publication statusPublished - 14 Oct 2020
Event 5th World Congress on Momentum, Heat and Mass
Transfer
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Duration: 14 Oct 202016 Oct 2020

Publication series

NameProceedings of the World Congress on Momentum, Heat and Mass Transfer
ISSN (Print)2371-5316

Conference

Conference 5th World Congress on Momentum, Heat and Mass
Transfer
Abbreviated titleMHMT'20
Period14/10/2016/10/20

Keywords

  • Flow boiling
  • Microchannels
  • Multiphase flow
  • VOF
  • Conjugate heat transfer

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