Film Dynamics Relevant To Spray Cooling
Author(s)
E. Gehring, G. Soriano, Y. P. Lin, J. L. Alvarado
& M. F. Trujillo
Abstract
For a number of years spray cooling has shown to be a viable alternative for
thermal management of high-density electronics. Nevertheless, the key
fundamental physical processes are to a large degree poorly understood due
mostly to the complicated fluid dynamics resulting from nucleate boiling
coupled with spray drop impingement. In this combined experimental and
modeling effort, a representative configuration consisting of a liquid film resting
on a solid silicon-based substrate with an imposed constant heat flux and an
impinging train of droplets has been studied. This configuration mimics to a
great degree the physics of spray cooling, while simultaneously simplifying the
experimental and computational analysis to a manageable level. It is shown that
a number of statistically quasi-stationary states are possible by carefully
coordinating the heat flux and drop impingement rates. Studies were both
performed for water and FC-72. Due in part to its lower surface tension, the
quasi-stationary states for FC-72 were instantaneously much more chaotic than
the corresponding water cases. The OpenFoam (open source computational fluid
dynamics) code has been supplemented with an energy equation within the
existing Volume-of-Fluid infrastructure. This was used to analyze the dynamics
in the impingement region. It is shown that the temperature in this region is
approximately equal to the temperature of incident droplets. For all water and
FC-72 films, it was found that each droplet impact penetrated the entire thickness
of the film bringing a significant cooling effect on the heated substrate. This was
the case even for film thickness-to-impact droplet diameter ratios far exceeding
one.
Keywords: spray cooling, drop impingement, heat transfer enhancement, twophase
flow.
Keywords
spray cooling, drop impingement, heat transfer enhancement, twophase
flow
Related Book
Other papers in this volume
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