A Numerical Study of Flow and Heat Transfer in Rotating Rectangular Channels (AR=4) With 45 Deg Rib Turbulators by Reynolds Stress Turbulence Model  

Oleh:

Al-Qahtani, Mohammad ; Chen, Hamn-Ching ; Han, Je-Chin

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 125 no. 1 (Feb. 2003), page 19-26.
Topik: rectangular waveguide; numerical study; flow; heat transfer; rotating rectangular channels; rib turbulators; reynolds stress; turbulence model

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.6 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Computations were performed to study three - dimensional turbulent flow and heat transfer in stationary and rotating 45 deg ribbed rectangular channels for which experimental heat transfer data were available. The channel aspect ratio (AR) is 4 : 1, the rib height - to - hydraulic diameter ratio (e / Dh) is 0.078 and the rib - pitch - to - height ratio (P / e) is 10. The rotation number and inlet coolant - to - wall density ratios, AP / P, were varied from 0.0 to 0.28 and from 0.122 to 0.40, respectively, while the Reynolds number was fixed at 10,000. Also, two channel orientations (b = 90 deg and 135 deg from the rotation direction) were investigated with focus on the high rotation and high density ratios effects on the heat transfer characteristics of the 135 deg orientation. These results show that, for high rotation and high density ratio, the rotation induced secondary flow overpowered the rib induced secondary flow and thus change significantly the heat transfer characteristics compared to the low rotation low density ratio case. A multi - block Reynolds - Averaged Navier - Stokes (RANS) method was employed in conjunction with a near - wall second - moment turbulence closure. In the present method, the convective transport equations for momentum, energy, and turbulence quantities are solved in curvilinear, body-fitted coordinates using the finite - analytic method.

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