Instabilities in Multiphase Flows pp 101-111 | Cite as
A Mathematical Description of the Critical Heat Flux as a Non-Linear Dynamic Instability
Abstract
The thermofluid dynamics of pool boiling heat transfer was theoretically studied. A two-phase flow integral model was formulated for the local boiling field adjacent to the heated wall. A set of three non-linear differential equations model the dynamics of the localized void fraction, bubble number density and vapor velocity. The boiling crisis at the critical heat flux is described as a dynamic transition caused by the competition of bubbles coalescence and breakup mechanisms. An analysis of a case of pool boiling in water is presented, showing the consistency of the formulation. The model has potential applications to thermal management of electronic microchips and devices for space environments.
Keywords
Heat Flux Control Volume Void Fraction Critical Heat Flux Boiling Heat TransferPreview
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