Transition flow in a heat pipe

MrDaimon · November 26, 2013, 11:48

Hi everybody,
I am simulating (using Fluent 12.1) a flux of oil in a heat pipe. Obviously the turbulence of the fluid influences the heat flux generated. I have Reynolds = 1911, which turbulence model is the best to use in this case? Should I use the laminar model? If no, which transition model is the best for my application? I hope I've been clear.
Thank you all!

Zaktatir · November 26, 2013, 16:40

you have to make a sensitivity analysis between laminar/ and low-Re turbulence model.

I would use low Re turbulence models:

SST with Low-Re correction, or better the transitional ones in Fluent. There other k-epsilon based turbulence models which are low-Re ones (access over TUI)

your yplus hast to be in the viscous sublayer around 1-max 5 expansion in the boundary layer 1.1-1.2

November 26, 2013, 11:48	Transition flow in a heat pipe	#1
MrDaimon New Member Gilberto Santo Join Date: Apr 2012 Location: Gent (Belgium) Posts: 18 Rep Power: 14	Hi everybody, I am simulating (using Fluent 12.1) a flux of oil in a heat pipe. Obviously the turbulence of the fluid influences the heat flux generated. I have Reynolds = 1911, which turbulence model is the best to use in this case? Should I use the laminar model? If no, which transition model is the best for my application? I hope I've been clear. Thank you all!

November 26, 2013, 16:40		#2
Zaktatir Senior Member Join Date: Jan 2010 Location: Germany Posts: 268 Rep Power: 17	you have to make a sensitivity analysis between laminar/ and low-Re turbulence model. I would use low Re turbulence models: SST with Low-Re correction, or better the transitional ones in Fluent. There other k-epsilon based turbulence models which are low-Re ones (access over TUI) your yplus hast to be in the viscous sublayer around 1-max 5 expansion in the boundary layer 1.1-1.2 MrDaimon likes this.

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