flow in a vertical annulus

ramcharan · December 14, 2010, 03:01

hi,, i am modelling a flow in vertical annulus with porous media, with centrally placed heater and flow inlet and outlet conditions. it is surrounded by insulation. boundary conditions given are velocity inlet , volumetric heat generation and out flow. i am getting a reversed flow and there is no temperature rise in the annulus.

help me.....

bunny · December 14, 2010, 03:15

hi.... i am also dealing with the same kind of problem. i have problem with out flow condition. i extended the domain and imposing new conditions....

bunny · December 16, 2010, 02:35

i tried it n i didnt got the answer.....can any body help us

Rashmichem · December 16, 2010, 12:15

hi

Check your operationg conditions..(Gravity) and try changing BC for velocity use direction and magnitude option.

good luck

bunny · December 22, 2010, 02:48

i gave velocity inlet and outflow condition, volumetric heat generation from heater and remaining side adiabatic.. i am using boussinesq approximation....

Rashmichem · December 22, 2010, 04:14

Change your outlet BC to outflow. and let us know about your results.

bunny · December 23, 2010, 07:27

if i use air instead of water ..temperatures r rising upto 100 deg. for water its not lik that. volumetric heat generation is 300000 w/m^3.

also pls tell me how to model a porous medium....

December 14, 2010, 03:01	flow in a vertical annulus	#1
ramcharan New Member Arun Join Date: Dec 2010 Posts: 1 Rep Power: 0	hi,, i am modelling a flow in vertical annulus with porous media, with centrally placed heater and flow inlet and outlet conditions. it is surrounded by insulation. boundary conditions given are velocity inlet , volumetric heat generation and out flow. i am getting a reversed flow and there is no temperature rise in the annulus. help me.....

December 16, 2010, 12:15	reversed flow	#4
Rashmichem New Member Join Date: Dec 2010 Posts: 5 Rep Power: 16	hi Check your operationg conditions..(Gravity) and try changing BC for velocity use direction and magnitude option. good luck

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December 14, 2010, 03:15		#2
bunny New Member bunny Join Date: Dec 2010 Posts: 5 Rep Power: 16	hi.... i am also dealing with the same kind of problem. i have problem with out flow condition. i extended the domain and imposing new conditions....

December 16, 2010, 02:35		#3
bunny New Member bunny Join Date: Dec 2010 Posts: 5 Rep Power: 16	i tried it n i didnt got the answer.....can any body help us

December 22, 2010, 02:48		#5
bunny New Member bunny Join Date: Dec 2010 Posts: 5 Rep Power: 16	i gave velocity inlet and outflow condition, volumetric heat generation from heater and remaining side adiabatic.. i am using boussinesq approximation....

December 22, 2010, 04:14		#6
Rashmichem New Member Join Date: Dec 2010 Posts: 5 Rep Power: 16	Change your outlet BC to outflow. and let us know about your results.

December 23, 2010, 07:27		#7
bunny New Member bunny Join Date: Dec 2010 Posts: 5 Rep Power: 16	if i use air instead of water ..temperatures r rising upto 100 deg. for water its not lik that. volumetric heat generation is 300000 w/m^3. also pls tell me how to model a porous medium....