thermal boundry layer -- CFD Online Discussion Forums

January 8, 2017, 15:19	thermal boundry layer	#1
sa har Member sa har Join Date: Aug 2014 Posts: 34 Rep Power: 11	i have 2 channel with different hydraulic diameter (25mm and 30mm). air is moved in them by natural convection. boundary condition in 2 case are similar. walls of channel are under heat flux and thermal boundary layer is not fully developed in channels.finally channel with Dh=25mm has more Q=mcp(Tout-Tint) and walls temperature. can you help me to explain this phenomena? i think that when hydraulic diameter is lower, thermal boundary layer grows faster, so heat transfer between air and walls should be lower. can you explain it?

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