The addition of mist to a flow of steam or gas offers enhanced cooling for many applications, including cooling of gas turbine blades. The enhancement mechanisms include effects of mixing of mist with the gas phase and effects of evaporation of the droplets. An impinging mist flow is attractive for study because the impact velocity is relatively high and predictable. Water droplets, less than 15 μm diameter and at concentrations below 10 percent, are considered. The heat transfer is assumed to be the superposition of three components: heat flow to the steam, heat flow to the dispersed mist, and heat flow to the impinging droplets. The latter is modeled as heat flow to a spherical cap for a time dependent on the droplet size, surface tension, impact velocity and surface temperature. The model is used to interpret experimental results for steam invested with water mist in a confined slot jet. The model results follow the experimental data closely.
Issue Section:
Evaporation, Boiling, and Condensation
Keywords:
Augumentation,
Droplet,
Evaporation,
Heat Transfer,
Impingement,
Modeling,
disperse systems,
steam,
water,
evaporation,
mixing,
cooling,
heat transfer,
drops,
surface tension
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.Copyright © 2001
by ASME
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