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calculationg heat transfer coefficient in a packe bed

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Old   June 17, 2015, 05:55
Unhappy calculationg heat transfer coefficient in a packe bed
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sarah
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Hi,
I am supposed to simulate heat transfer in a packed bed of fuel spheres. I use FLUENT 14.5. in literature, Heat transfer coefficient is about 20000, but in Fluent , Wall function heat trans coef , it is 300.
I know, I should use the following formula to calculate HTC:

h = heat_flux / (T(z) - Tbulk(z))

but there is a problem related to heat flux;
I don't know how to find it in fluent.

should I go the following path to find heat flux?
report>fluxes>heat transfer rate> inlet-outlet

Thank you
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Old   June 18, 2015, 05:56
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liusuanyatong
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I think you are right.But I'm not sure.I have some question about heat flux.
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Old   June 18, 2015, 13:24
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shirin patil
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Then how will find the heat flux for constant wall temperature to find the nusselt number
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Old   June 18, 2015, 14:17
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it will work for constant wall temp, and after you calculate heat flux you can obtain Nu simply by using following eq:

Nu= ( heat_flux/T-T_wall) *L/K_fluid
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