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.
|Title of host publication||Proceedings of the World Congress on Momentum, Heat and Mass Transfer (MHMT'20)|
|Publication status||Published - 14 Oct 2020|
|Event|| 5th World Congress on Momentum, Heat and Mass|
Duration: 14 Oct 2020 → 16 Oct 2020
|Name||Proceedings of the World Congress on Momentum, Heat and Mass Transfer|
|Conference|| 5th World Congress on Momentum, Heat and Mass|
|Period||14/10/20 → 16/10/20|
- Flow boiling
- Multiphase flow
- Conjugate heat transfer
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- School of Arch, Tech and Eng - Principal Lecturer
- Advanced Engineering Centre