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 language | English |
---|---|
Title of host publication | Proceedings of the World Congress on Momentum, Heat and Mass Transfer (MHMT'20) |
DOIs | |
Publication status | Published - 14 Oct 2020 |
Event | 5th World Congress on Momentum, Heat and Mass Transfer - Duration: 14 Oct 2020 → 16 Oct 2020 |
Publication series
Name | Proceedings 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 title | MHMT'20 |
Period | 14/10/20 → 16/10/20 |
Keywords
- Flow boiling
- Microchannels
- Multiphase flow
- VOF
- Conjugate heat transfer
Fingerprint
Dive into the research topics of 'Effect of Channel Aspect Ratio on Flow Boiling Characteristics within Rectangular Micro-passages'. Together they form a unique fingerprint.Profiles
-
Anastasios Georgoulas
- School of Arch, Tech and Eng - Principal Lecturer
- Centre for Regenerative Medicine and Devices
- Advanced Engineering Centre
Person: Academic
-
Nicolas Miche
- School of Arch, Tech and Eng - Principal Lecturer
- Centre for Regenerative Medicine and Devices
- Advanced Engineering Centre
Person: Academic