Multi-phase Mixture Modelling Of Nucleate
Boiling Applied To Engine Coolant Flows
Author(s)
V. Pržulj & M. Shala
Abstract
The paper reports on the use of the homogeneous multi-phase mixture modelling
approach to simulate nucleate boiling in low pressure flows. A variant of the
RPI (Rensselaer Polytechnic Institute) mechanistic nucleate boiling model provides
closures for the wall thermal conditions and mass transfer rates due to phase
change in the bulk flow. The bubble departure diameter at the wall and the bubble
bulk diameter are identified as the most influential factors and their original model
coefficients are modified.
The numerical difficulties due to large density variations associated with phase
change are successfully addressed in conjunction with the segregated pressure
based SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithm.
The nucleate boiling model has been compared against published data from two
experiments. The computed and measured values for the wall heat flux and vapour
volume fractions are in broad agreement. The model capability is also demonstrated
for the engine coolant flow where the conjugate heat transfer problem
involving complex engine components is solved.
Keywords: CFD, nucleate boiling, multi-phase mixture, RPI model, engine cooling.
Keywords
CFD, nucleate boiling, multi-phase mixture, RPI model, engine cooling
Related Book
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