Forced convection water h coefficient

PDH · May 4, 2020, 11:44

Hi, what can be a good estimate for the h coefficient for water in forced convection?

I'm simulating the conduction of heat through a copper piece. One side with air at ambient temperature and the other side with air at 600 ºC. I have big cooler circuits for the water. I'm using 3000 W/m^2K and the results are completely conditioned by the temperature of the water. Even the face in contact with the 600 ºC air is at the water temperature. I don't know if that makes sense.

Thanks for your help!

aero_head · December 31, 2020, 23:59

Hello Pablo,

The convection coefficient for liquids ranges from 100 - 15,000. Are you asking how to calculate this for your specific scenario?

You can calculate the convection coefficient by using

h = Q_conv /A(T_inf - T_surface)

It also does not really make sense to have the surface in contact with the 600ºC air to be exactly 600ºC.

May 4, 2020, 11:44	Forced convection water h coefficient	#1
PDH New Member Pablo Diaz Join Date: Apr 2020 Posts: 4 Rep Power: 6	Hi, what can be a good estimate for the h coefficient for water in forced convection? I'm simulating the conduction of heat through a copper piece. One side with air at ambient temperature and the other side with air at 600 ºC. I have big cooler circuits for the water. I'm using 3000 W/m^2K and the results are completely conditioned by the temperature of the water. Even the face in contact with the 600 ºC air is at the water temperature. I don't know if that makes sense. Thanks for your help!

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December 31, 2020, 23:59		#2
aero_head Senior Member Kira Join Date: Nov 2020 Location: Canada Posts: 435 Rep Power: 8	Hello Pablo, The convection coefficient for liquids ranges from 100 - 15,000. Are you asking how to calculate this for your specific scenario? You can calculate the convection coefficient by using h = Q_conv /A(T_inf - T_surface) It also does not really make sense to have the surface in contact with the 600ºC air to be exactly 600ºC.