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Modelling of Dropwise Evaporative Cooling on a Semi-Infinite Solid Subjected to Radiant Heat Input.


pdf icon Modelling of Dropwise Evaporative Cooling on a Semi-Infinite Solid Subjected to Radiant Heat Input. (501 K)
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, Gaithersburg, MD

Keywords:

fire research; fire safety; fire science; solids; cooling; evaporation; formulations; validation

Abstract:

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.