# Stanton Number and Arbitrary Surface Temperature

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 LinkBack Thread Tools Display Modes
 March 8, 2006, 22:36 Stanton Number and Arbitrary Surface Temperature #1 Boris Vaisman Guest   Posts: n/a Hello everyone, -- problem -- Please advise, how would you calculate the Stanton Number (St) on flat plate with an arbitrary surface temperature? Per se, if air inlet temperature (T_in) is 1000 and the plate surface (T_w) goes from 500 to 1000. What is the proper way to calculate St? -- details -- In general St = q_w(x)/(rho*c_p*u*dT), where: - rho, c_p, and u are evaluated at free stream values - q_w(x) is evaluated at the wall - dT is either a reference value or T_in-T_w(x) My dilemma is a follows. (1) If dT is a constant reference value, St would change sign, as T_w changes from T_wT_in. This seems to contradict all definitions of the Reynolds Analogy Factor (R). Consider von Karman or Spalding and Chi, R is always positive and constant or almost constant. (2) On the other hand, if dT(x)= T_in-T_w(x), there will be a point where q_w(x) changes sign (for the above scenario), but dT(x) has not changed sign yet (for a short distance). This will cause St to explode. This is also problematic. What is the proper way to calculate St? ---- Thank you very much for your time and help. Boris Vaisman

 March 9, 2006, 05:43 Re: Stanton Number and Arbitrary Surface Temperatu #2 versi Guest   Posts: n/a In my case, St number is St = q_w(x)/(rho*u*dH), where dH= H_in-H_w, H is total enthaphy=h + q^2/2. Unless singificantly heating from interior, dH always >0.

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post maddalena OpenFOAM 5 December 1, 2011 14:46 andreasp OpenFOAM Programming & Development 6 June 5, 2011 15:58 ouafa Open Source Meshers: Gmsh, Netgen, CGNS, ... 7 May 21, 2010 12:43

All times are GMT -4. The time now is 14:05.

 Contact Us - CFD Online - Top