Modelling of Dropwise Evaporative Cooling on a Semi-Infinite Solid Subjected to Radiant Heat Input.
Modelling of Dropwise Evaporative Cooling on a
Semi-Infinite Solid Subjected to Radiant Heat Input.
White, G.; Tinker, S. C.; diMarzo, M.
International Association for Fire Safety Science. Fire
Safety Science. Proceedings. 4th International
Symposium. July 13-17, 1994, Ottawa, Ontario, Canada,
Intl. Assoc. for Fire Safety Science, Boston, MA,
Kashiwagi, T., Editor(s), 217-228 pp, 1994.
Sponsor:National Institute of Standards and Technology,
fire research; fire safety; fire science; solids;
cooling; evaporation; formulations; validation
A model for the prediction of dropwise evaporative
cooling over hot solid surfaces is proposed for the case
of radiant heat input. A detailed representation of the
droplet shape during the transient is provided. The
direct radiant contribution to the evaporative process
is expressed as a liquid-vapor interfacial term and a
constant heat absorption term within the liquid layer.
The liquid layer is treated with a one-dimensional heat
conduction approximation justified by previous results
and three sub-models are used to describe it during the
transient. A boundary element method for the solid
thermal behavior, previously developed, is extended to
this case. The results obtained from a closed-form
solution, with simplified solid-liquid interfacial
boundary conditions, are also included. Comparisons with
the experimental data illustrate the adequacy of the
model and the performance of the closed-form solution.