Abstract
The heat transfer mechanism of Nucleate Boiling (NB) is widely used in technological applications. However,there is an incomplete understanding of the fundamental physics of bubble dynamics, at small scales as well as at non-trivial geometrical configurations. In order to investigate bubble dynamics an adiabatic approach is often used, where gas/vapor bubbles are injected into liquids at saturation conditions. So far, there is a great deal of experimental, theoretical and numerical investigations on adiabatic gas/vapor injected bubble growth dynamics. However, according to the authors' best knowledge the majority of these works deal with gas/vapor bubbles injected upwards into stagnant liquid domains, with the injection axis being parallel to the gravitational acceleration direction, using mainly water and air as the working fluids. In the present investigation, an improved algebraic VOF (Volume of Fluid) based interface capturing approach, originally developed in OpenFOAM®, is applied for the conduction of axisymmetric and 3D numerical experiments on adiabatic bubble growth dynamics. The investigation focuses on the influence of different fluid properties and inclination angles of the gas/vapor injection orifice, on the bubble growth and detachment characteristics. Prior to the application, the predictions of the numerical model are validated against literature available experimental data. From the overall results it can be concluded that the bubble growth and detachment characteristics, are strongly dependent not only on the fluid properties but also on the orifice inclination angles due to the induced asymmetry, which mainly results from the formation of asymmetric and unsynchronized vortexes during the bubble growth process.
Original language | English |
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Title of host publication | Proceedings of the 15th International Heat Transfer Conference, IHTC-15 |
Place of Publication | Kyoto, Japan |
Pages | 0-0 |
Number of pages | 1 |
DOIs | |
Publication status | Published - 15 Aug 2014 |
Event | Proceedings of the 15th International Heat Transfer Conference - Kyoto, Japan, August 10-15, 2014 Duration: 15 Aug 2014 → … |
Conference
Conference | Proceedings of the 15th International Heat Transfer Conference |
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Period | 15/08/14 → … |
Keywords
- Computational methods
- Two-phase/Multiphase flow
- Numerical simulation
- Boiling
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Anastasios Georgoulas
- School of Arch, Tech and Eng - Principal Lecturer
- Centre for Regenerative Medicine and Devices
- Advanced Engineering Centre
Person: Academic