Abstract
Pressure gradients act differently on liquid particles and suspended bubbles and are, therefore, capable of inducing a relative motion between the phases even when no relative velocity initially exists. As a consequence of the enhanced heat transfer in the presence of convection, this fact may have a major impact on the evolution of a vapor bubble. The effect is particularly strong in the case of a collapsing bubble for which, due to the conservation of the system¿s impulse, the induced relative velocity tends to be magnified when the bubble volume shrinks. A practical application could be, for instance, the enhancement of the condensation rate of bubbles downstream of a heated region, thereby reducing the quality of a flowing liquid¿vapor mixture. A simple model of the process, in which the bubble is assumed to be spherical and the flow potential, is developed in the paper.
Original language | Undefined |
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Pages (from-to) | 3539-3550 |
Number of pages | 12 |
Journal | International journal of heat and mass transfer |
Volume | 43 |
Issue number | 19 |
DOIs | |
Publication status | Published - 2000 |
Keywords
- IR-24816
- Boiling
- METIS-129617
- Vapor bubbles
- Two phase flow