Numerical Simulation of Turbulent Fluid Flow and Heat Transfer in a Ribbed Rotating Two-Pass Square Duct

• Main Authors: Liou Tong-Miin, Chen Shih-Hui, Li Yi-Chen
• Format: Article
• Language: English
• Published: Hindawi Limited 2005-01-01
• Series: International Journal of Rotating Machinery
• Subjects: ribbed rotating duct; turbulent flow; heat transfer; two-layer model; RANS
• Online Access: http://www.hindawi.net/access/get.aspx?journal=ijrm&volume=2005&pii=S1023621X02505042

<p>The local turbulent fluid flow and heat transfer in a rotating two-pass square duct with 19 pairs of in-line <math alttext="$90^{circ}$"><msup><mn>90</mn> <mo>&compfn;</mo> </msup> </math> ribs have been investigated computationally. A Reynolds-averaged Navier-Stokes equation (RANS) with a two-layer <math alttext="${k}-varepsilon$"><mi>k</mi> <mo>&minus;</mo> <mi>&varepsilon;</mi> </math> turbulence model was solved. The in-line <math alttext="$90^{circ}$"><msup><mn>90</mn> <mo>&compfn;</mo> </msup> </math> ribs were arranged on the leading and trailing walls with rib height-to-hydraulic diameter ratio and pitch-to-height ratio of <math alttext="$0.136$"><mn>0.136</mn> </math> and 10, respectively. The Reynolds number, based on duct hydraulic diameter and bulk mean velocity, was fixed at <math alttext="$1.0 imes 10^{4}$"><mn>1.0</mn> <mo>&times;</mo> <msup><mn>10</mn> <mn>4</mn> </msup> </math> whereas the rotational number varied from 0 to <math alttext="$0.2$"><mn>0.2</mn> </math> . Results are validated with previous measured velocity field and heat transfer coefficient distributions. The validation shows that the effect of rotation on the passage-averaged Nusselt number ratio can be predicted reasonably well; nevertheless, the transverse mean velocity and, in turn, the distribution of regional-averaged Nusselt number ratio are markedly underpredicted in the regions toward which the Coriolis force is directed. Further CFD studies are needed.</p>