Abstract
In the present paper, the effects of heating surface roughness on characteristics of mist cooling were experimentally studied with the objective of application in a controlled cooling method in the steel industry. To do this, artificial and systematic roughnesses were inscribed on the surfaces of test plates which were made of silver and stainless steel (SUS 303). The height of surface roughness and the pitch to height ratio were varied from 3 to 91 μm and from 2 to 40 respectively. The experimental conditions of mist flow were as follows : the air velocity was Va=20 m/s, the temperature of the water droplet T1=21°C, and the volumetric-droplet-flow-rate was D=0.0003-0.005 m3/m2s. The experimental results show that surface roughness of some specific profile is effective in stabilizing cooling rates by mist flow.
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