Publication Date:
2013-08-31
Description:
The main characteristics and the potential advantages of generalized drift flux models are presented. In particular it is stressed that the issue on the propagation properties and on the mathematical nature (hyperbolic or not) of the model and the problem of closure are easier to tackle than in two fluid models. The problem of identifying the differential void-drift closure law inherent to generalized drift flux models is then addressed. Such a void-drift closure, based on wave properties, is proposed for bubbly flows. It involves a drift relaxation time which is of the order of 0.25 s. It is observed that, although wave properties provide essential closure validity tests, they do not represent an easily usable source of quantitative information on the closure laws.
Keywords:
FLUID MECHANICS AND HEAT TRANSFER
Type:
NASA, Marshall Space Flight Center, Constitutive Relationships and Models in Continuum Theories of Multiphase Flows; p 1-17
Format:
application/pdf
