Heat Transfer and Friction in a Low-Aspect-Ratio Rectangular Channel with Staggered Slit-Ribbed Walls
Fully developed heat transfer and friction in a rectangular channel with slit-ribbed walls are examined experimentally. The slit ribs are transversely arranged on the bottom and top channel walls in a staggered manner. Effects of rib open-area ratio (β= 24%, 37%, and 46%), rib pitch-to-height ratio...
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| Format: | Article |
| Language: | English |
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Wiley
1998-01-01
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| Series: | International Journal of Rotating Machinery |
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| Online Access: | http://dx.doi.org/10.1155/S1023621X98000244 |
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| author | Jenn-Jiang Hwang Tong-Miin Liou |
| author_facet | Jenn-Jiang Hwang Tong-Miin Liou |
| author_sort | Jenn-Jiang Hwang |
| collection | DOAJ |
| description | Fully developed heat transfer and friction in a rectangular channel with slit-ribbed walls are examined experimentally. The slit ribs are transversely arranged on the bottom and top
channel walls in a staggered manner. Effects of rib open-area ratio (β= 24%, 37%, and 46%), rib pitch-to-height ratio (Pi/H=10,15and20), and Reynolds number (10,000≤Re≤50,000) are examined. The rib height-to-channel hydraulic diameter ratio is fixed at
H/De=0.081. It is disclosed that the heat transfer coefficient for the slit-ribbed channel is
higher than that for the solid-ribbed channel, and increases with rib open-area ratio. Results
also show that the friction factor for the slit-ribbed channel is significantly lower than that
for the solid-ribbed one. Moreover, the ribs with larger open-area ratios in a higher flow
Reynolds number condition could give the better thermal performance under the constant
friction power constraint. Roughness functions for friction and heat transfer are further
developed in terms of rib and flow parameters. |
| format | Article |
| id | doaj-art-5641581ca6774869a4be47464819dc4c |
| institution | Kabale University |
| issn | 1023-621X |
| language | English |
| publishDate | 1998-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-5641581ca6774869a4be47464819dc4c2025-02-03T00:59:10ZengWileyInternational Journal of Rotating Machinery1023-621X1998-01-014428329110.1155/S1023621X98000244Heat Transfer and Friction in a Low-Aspect-Ratio Rectangular Channel with Staggered Slit-Ribbed WallsJenn-Jiang Hwang0Tong-Miin Liou1Department of Mechanical Engineering, Chung-Hua University, Hsinchu 300, TaiwanDepartment of Power Mechanical Engineering, National Tsing-Hua University, Hsinchu 300, TaiwanFully developed heat transfer and friction in a rectangular channel with slit-ribbed walls are examined experimentally. The slit ribs are transversely arranged on the bottom and top channel walls in a staggered manner. Effects of rib open-area ratio (β= 24%, 37%, and 46%), rib pitch-to-height ratio (Pi/H=10,15and20), and Reynolds number (10,000≤Re≤50,000) are examined. The rib height-to-channel hydraulic diameter ratio is fixed at H/De=0.081. It is disclosed that the heat transfer coefficient for the slit-ribbed channel is higher than that for the solid-ribbed channel, and increases with rib open-area ratio. Results also show that the friction factor for the slit-ribbed channel is significantly lower than that for the solid-ribbed one. Moreover, the ribs with larger open-area ratios in a higher flow Reynolds number condition could give the better thermal performance under the constant friction power constraint. Roughness functions for friction and heat transfer are further developed in terms of rib and flow parameters.http://dx.doi.org/10.1155/S1023621X98000244Slit ribRib open-area ratioThermal performanceRoughness function. |
| spellingShingle | Jenn-Jiang Hwang Tong-Miin Liou Heat Transfer and Friction in a Low-Aspect-Ratio Rectangular Channel with Staggered Slit-Ribbed Walls International Journal of Rotating Machinery Slit rib Rib open-area ratio Thermal performance Roughness function. |
| title | Heat Transfer and Friction in a Low-Aspect-Ratio
Rectangular Channel with Staggered Slit-Ribbed Walls |
| title_full | Heat Transfer and Friction in a Low-Aspect-Ratio
Rectangular Channel with Staggered Slit-Ribbed Walls |
| title_fullStr | Heat Transfer and Friction in a Low-Aspect-Ratio
Rectangular Channel with Staggered Slit-Ribbed Walls |
| title_full_unstemmed | Heat Transfer and Friction in a Low-Aspect-Ratio
Rectangular Channel with Staggered Slit-Ribbed Walls |
| title_short | Heat Transfer and Friction in a Low-Aspect-Ratio
Rectangular Channel with Staggered Slit-Ribbed Walls |
| title_sort | heat transfer and friction in a low aspect ratio rectangular channel with staggered slit ribbed walls |
| topic | Slit rib Rib open-area ratio Thermal performance Roughness function. |
| url | http://dx.doi.org/10.1155/S1023621X98000244 |
| work_keys_str_mv | AT jennjianghwang heattransferandfrictioninalowaspectratiorectangularchannelwithstaggeredslitribbedwalls AT tongmiinliou heattransferandfrictioninalowaspectratiorectangularchannelwithstaggeredslitribbedwalls |