Buoyancy-Driven Flow Reversal Phenomena in Radially Rotating Serpentine Ducts  

Oleh:

Hwang, J. J. ; W.-J. Wang ; Cha'o, Kuang Chen

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 122 no. 1 (Feb. 2000), page 179-182.
Topik: rotating; bouyancy - driven flow; phenomena; radially rotating; serpentine duicts

Ketersediaan

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

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Isi artikel

Convective characteristics are analyzed numerically in a rotating multipass square duct connecting with 180 - deg sharp returns. Isoflux is applied to each duct wall and periodic conditions are used between the entrance and exit of a typical two - pass module. Emphasis is placed on the phenomenon of buoyancy - driven reversed flow in the serpentine duct. Predictions reveal that the radial distance from the rotational axis to the location of flow separation in the radial - outward duct decreases with increasing the Richardson number. In addition, the local buoyancy that is required to yield the radial flow reversal increases with increasing the rotation number. This buoyancy - driven reversed flow in the radial - outward duct always results in local hot spots in the cooling channels. The critical buoyancy for the initiation of flow reversal is therefore concluded for the design purpose.

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