Heat Transfer in Two-Pass Rotating Rectangular Channels (AR-2) With Five Different Orientations of 45 Deg V-Shaped Rib Turbulators  

Oleh:

Han, Je-Chin ; Griffth, Todd ; Al-Hadhrami, Luai

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 125 no. 2 (Apr. 2003), page 232-242.
Topik: rectangular waveguide; heat transfer; two - pass rotating; rectangular channels; v - shaped rib turbulators

Ketersediaan

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

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Isi artikel

An experimental study was made to obtain heat transfer data for a two - pass rectangular channel (aspect ratio = 2 : 1) with smooth and ribbed surfaces for two channel orientations (90 deg and 135 deg with respect to the plane of rotation). The V - shaped ribs are placed on the leading and trailing surfaces. Five different arrangements of 45 deg V - shaped ribs are studied. The Reynolds number and rotation number ranges are 5000 – 40000, and 0.0 – 0.21, respectively. The rib height to hydraulic diameter ratio (e / D) is 0.094 ; the rib pitch - to - height ratio (P / e) is 10 ; and the inlet coolant - to - wall density ratio (AP / P) is maintained around 0.115 for every test. The results show that the rotation - induced secondary flow enhances the heat transfer of the first pass trailing surface and second pass leading surface. However, the first pass leading and the second pass trailing surfaces show a decrease in heat transfer with rotation. The results also show that parallel 45 deg V - shaped rib arrangements produce better heat transfer augmentation than inverted 45 deg V - shaped ribs and crossed 45 deg V - shaped ribs, and a 90 deg channel orientation produces greater rotating effect on heat transfer than a 135 deg orientation.

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