# Implement constant heat flux boundary condition

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 April 6, 2012, 11:09 Implement constant heat flux boundary condition #1 Member   Peter Join Date: Oct 2011 Posts: 52 Rep Power: 6 I have written a matlab code that will solve for the developing temperature field given a velocity field. At the moment I have already implemented the constant wall temperature boundary condition and the results look correct. Now I am trying to implement the constant heat flux boundary condition. I have the equation below where T_1 is the first interior point and T_w is the wall temperature. I convert to non dimensional temp and calculate the appropriate so that it satisfies the flux and implement it as a dirichlet condition. When I calculate Nu, defined as it doesn't ever reach steady state. When it is supposed to reach steady state, the wall temperature increases more slowly than the bulk temperature and I get a decreasing Nu. Anyone seen this type of behavior before or know whats going on? Am I implementing the constant flux boundary condition properly?

 April 6, 2012, 21:46 #2 Senior Member     p ding Join Date: Mar 2009 Posts: 309 Rep Power: 10 "and calculate the appropriate so that it satisfies the flux and implement it as a dirichlet condition" Could you pleaase explain" implement the second kind bc as a first kind". at the heat flux bc, the boundary condition should like partial(theta)/partial(n)=?

 April 6, 2012, 23:35 #3 Member   Peter Join Date: Oct 2011 Posts: 52 Rep Power: 6 so by subbing in the equatioin becomes In my case I have also non dimensionalized y as y*H = y. I know everything in the above equation except for so I can solve for it and then I implement it as a dirichlet condition.

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