Equivalent Evaporative Heat Transfer Coefficient
Equivalent Evaporative Heat Transfer Coefficient
(OP)
Hello,
I have created an ANSYS transient thermal model for hopefully validating and characterizing the heat flux through a test instrument design to study microchannel evaporation. In general, after a thorough literature review, evaporative heat transfer is still a fairly vague subject, so I was hoping for some help.
I need to calculate an average heat transfer coefficient for the thin film evaporation of a fluid. I know the volume, molar density, enthalphy change of vaporization, etc. of the fluid droplet that spreads over a horizontal surface. What I need are an equivalent heat transfer coefficient, and appropriate reference temperature for the ANSYS transient thermal analysis.
If anyone could direct me in the proper direction, that would be excellent. Thank you all in advance for your help.
Taylor
I have created an ANSYS transient thermal model for hopefully validating and characterizing the heat flux through a test instrument design to study microchannel evaporation. In general, after a thorough literature review, evaporative heat transfer is still a fairly vague subject, so I was hoping for some help.
I need to calculate an average heat transfer coefficient for the thin film evaporation of a fluid. I know the volume, molar density, enthalphy change of vaporization, etc. of the fluid droplet that spreads over a horizontal surface. What I need are an equivalent heat transfer coefficient, and appropriate reference temperature for the ANSYS transient thermal analysis.
If anyone could direct me in the proper direction, that would be excellent. Thank you all in advance for your help.
Taylor





RE: Equivalent Evaporative Heat Transfer Coefficient
RE: Equivalent Evaporative Heat Transfer Coefficient
RE: Equivalent Evaporative Heat Transfer Coefficient
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RE: Equivalent Evaporative Heat Transfer Coefficient
which has
RE: Equivalent Evaporative Heat Transfer Coefficient
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RE: Equivalent Evaporative Heat Transfer Coefficient
Older correlations by Bergles, Whalley, Rosenhow, Groeneveld may be used, but I prefer the ones by KWU authors Kiefer, Kohler and Hein
"Whom the gods would destroy, they first make mad "
RE: Equivalent Evaporative Heat Transfer Coefficient
Is that reference by the KWU authors valid for open (calm water) oceans or lakes evaporating into the sky under light or medium winds?
Seems all I can find references for heat loss from open waters evaporating is the "loss of water level" method - invalid for oceans or sea water when water level really doesn't change with time. It would appear necessary to account for delta T between water surface and air of course, but also relative humidity in the air above the lake.
RE: Equivalent Evaporative Heat Transfer Coefficient
No, I had thought the interest was in cooling equipment, and not bodies of water. Papers on the topic of cooling ponds and environmental energy balances would be the likely source for the correlation you are after.
"Whom the gods would destroy, they first make mad "