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Dropwise Evaporative Cooling Radiative Field.


pdf icon Dropwise Evaporative Cooling Radiative Field. (559 K)
Tartarini, P.; diMarzo, M.

NIST GCR 96-687; Paper 10; 14-TP-23; June 1996.

Sponsor:

National Institute of Standards and Technology, Gaithersburg, MD

Available from:

National Technical Information Service
Order number: PB96-202304

Keywords:

water sprays; evaporation cooling; solid surfaces; droplets; formulations; equations; thermal conductivity

Abstract:

This paper investigates the evaporative cooling of solid surfaces induced by the impingement of single water droplets. The solid surface is heated by radiant panels from above; therefore, the radiant heat absorbed directly by the evaporating droplet has to be considered. A theoretical model is presented, which calculates the droplet evaporation time and the solid surface cooling for materials with thermal magnitude. In particular, results concerning droplet evaporation on Macor (low thermal conductivity material) are reported and discussed. The model accurately predicts the total evaporation time. It is further validated with transient surface temperature measurements obtained by infrared thermography. The predictions are in excellent agreement with the experimental data. The interfacial heat flux distribution under the evaporating droplet is studied. These single droplet results are currently being used to study the basis for the formulation of a multi-droplet comprehensive model.