laminar or tubulent of gas flow in tube with different diameters? -- CFD Online Discussion Forums

December 20, 2010, 22:17	laminar or tubulent of gas flow in tube with different diameters?	#1
Jiuan Member Dongzi Wei Join Date: Mar 2009 Posts: 33 Rep Power: 17	Dear Guys, The tube is composed of two co-axial parts, one is with small diameter and the other is with large diameter. For a certain flow rate of gas, the Reynolds number in the small-diameter part is larger than the critical reynolds number, but the Reynolds number in the large-diameter part is smaller than the critical reynolds number. I did not which model I should use, laminar or turbulent model? Thanks!

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