CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

chtMultiRegionFoam heat flux

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   September 27, 2013, 08:08
Default chtMultiRegionFoam heat flux
New Member
Join Date: Apr 2010
Location: Linz, Austria
Posts: 16
Rep Power: 16
sailor79 is on a distinguished road
Hi folks,

I want to simulate a block of steel which has a cooling channel (water) in it. A constant heat flux is applied on top of the block. You can see the geometry in the attached picture.

I applied the solidWallHeatFluxTemperature bc to the top. Unfortunately the heat flux at the top does not correspond to the heat flux removed by the water. Here are some values:

Heat flux density at the top: 50000 W/m
Area at the top: 0.03 m
--> total heat flux: 1500 W

Water velocity: 0.424 m/s
Channel diameter: 10e-3 m
Density: 997 kg/m
cp: 4182 J/kg/K
difference in Temperature inlet - outlet: 22 K
--> removed heat flux: ~3005 W

All the faces of the block are set to zeroGradient concerning Temperature.

I checked the heat flux over the channel Wall with swak4foam:
    type swakExpression;
    valueType patch;
    patchName mould_to_channel;
    verbose true;
    expression "-K*area()*snGrad(T)";
    accumulations (sum);
    region mould;
It is in the range of the applied heat flux at the top. Thermophysical properties of water are set to:
thermoType      hRhoThermo<pureMixture<constTransport<specieThermo<hConstThermo<incompressible>>>>>;
mixture         water 1 18 997.05 4182 0 890.08e-6 6.127; // 25C
Does someone have an idea what else I might check?

Thanks in advance

Attached Images
File Type: jpg geometry_openfoam.jpg (44.0 KB, 26 views)
sailor79 is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Total heat transf. rate vs Total surface heat flux Renato Sousa FLUENT 1 April 14, 2020 03:27
Wall Heat Flux & Temperature Greg Perkins FLUENT 10 November 20, 2015 09:32
Enforce bounds error with heat loss boundary condition at solid walls Chander CFX 2 May 1, 2012 20:11
Negative Heat Flux shashank312 FLUENT 3 December 9, 2011 17:00
CFX - wall heat flux divarano CFX 2 December 4, 2006 16:14

All times are GMT -4. The time now is 05:02.