Heat transfer for forced convection on a plate (NOT across a plate)
Heat transfer for forced convection on a plate (NOT across a plate)
(OP)
I'm looking for relevant calculations for forced convection on the face of a finite plate. There is plenty of information about forced convection across a plate, like a PCB cooled by a fan. Definitely not what I'm looking for.
The application is a vehicle-mounted optical window to be heated electrically to keep frost from forming.
Thanks,
Rob
The application is a vehicle-mounted optical window to be heated electrically to keep frost from forming.
Thanks,
Rob





RE: Heat transfer for forced convection on a plate (NOT across a plate)
Specifically, 10.3.1 Electrical Anti-Icing, Table 3F-3 shows values of windowing heating ranging from 2.44 W/in^2 to 4.26 W/in^2 for cruise speeds ranging from 100 kt to 300 kt, respectively. The numbers do NOT include heat losses to the cabin interior.
TTFN
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RE: Heat transfer for forced convection on a plate (NOT across a plate)
I've always thought of convection in terms of conduction to a fluid aided my mixing and buoyancy. This seems to meet those criteria. Why would you classify this case as conduction instead?
A little more Googling and stumbling around led me to the term impingement cooling, which seems closely related. Still, there is little readily available on the subject.
Thanks,
Rob
Rob Campbell, PE
Finite Monkeys - www.livejournal.com/users/robcampbell
RE: Heat transfer for forced convection on a plate (NOT across a plate)
SAE 1168-4 covers all regimes of flight, I think including supersonic. The basic objective is to raise the temperature of the window to just above freezing, and the heat required is dependent on the airstream velocity, but the heat required starts dropping as you get closer to transonic, since you then start to get substantial aeroheating and the windows won't need additional heating.
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