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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

DROPWISE EVAPORATIVE COOLING IN RADIATIVE FIELD

Get access (open in a dialog) DOI: 10.1615/IHTC10.5640
pages 277-282

Resumo

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 conductivity spanning over more than two orders of 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 cooling strategies for different materials, and constitute the basis for the formulation of a multi-droplet comprehensive model.