calculationg heat transfer coefficient in a packe bed

sarah l · June 17, 2015, 05:55

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

liusuanyatong · June 18, 2015, 05:56

I think you are right.But I'm not sure.I have some question about heat flux.

shirin3151 · June 18, 2015, 13:24

Then how will find the heat flux for constant wall temperature to find the nusselt number

sarah l · June 18, 2015, 14:17

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

June 17, 2015, 05:55	calculationg heat transfer coefficient in a packe bed	#1
sarah l Member sarah Join Date: Aug 2010 Posts: 42 Rep Power: 15	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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June 18, 2015, 05:56		#2
liusuanyatong New Member liusuanyatong Join Date: Jun 2015 Posts: 7 Rep Power: 10	I think you are right.But I'm not sure.I have some question about heat flux.

June 18, 2015, 13:24		#3
shirin3151 New Member shirin patil Join Date: Jul 2014 Posts: 2 Rep Power: 0	Then how will find the heat flux for constant wall temperature to find the nusselt number

June 18, 2015, 14:17		#4
sarah l Member sarah Join Date: Aug 2010 Posts: 42 Rep Power: 15	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