Local Heat Transfer and Pressure Drop in a Rotating Two-Pass Ribbed Rectangular Channel
The influences of rotation and uneven heating condition as well as passage aspect ratio on the local heat transfer coefficient and pressure drop in a rotating, two pass ribroughened (rib height e/DH≈0.27; rib pitch p/e=8) rectangular channel with a crosssection aspect ratio of 3 was studied for Reyn...
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| Format: | Article |
| Language: | English |
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Wiley
2001-01-01
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| Series: | International Journal of Rotating Machinery |
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| Online Access: | http://dx.doi.org/10.1155/S1023621X01000173 |
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| author | Shou-Shing Hsieh Hsiu-Cheng Liao |
| author_facet | Shou-Shing Hsieh Hsiu-Cheng Liao |
| author_sort | Shou-Shing Hsieh |
| collection | DOAJ |
| description | The influences of rotation and uneven heating condition as well as passage aspect ratio on the local heat transfer coefficient and pressure drop in a rotating, two pass ribroughened (rib height e/DH≈0.27; rib pitch p/e=8) rectangular channel with a crosssection aspect ratio of 3 was studied for Reynolds numbers from 5000 to 25,000 and rotation numbers from 0 to 0.24. Regionally averaged Nusselt number variations along
the duct have been determined over the trailing and leading surfaces for two pass straight channels and U-bend region. Implementing with the data from Hsieh and Liu (1996) for AR=1 and 1.5 with p/e=5 and e/DH=0.17 and 0.20, passage aspect ratio effect was further examined. Furthermore, data for 180∘ U-bend region with ribroughened turbulator on heat transfer were also measured. It was found that a complicated three-dimensional accelerated flow and secondary flow in this U-bend region caused higher heat transfer on both leading/trailing walls. Enhancement performance ratios are also presented and discussed. Results again indicate a slight decrease in heat transfer coefficient for an increase in passage aspect ratio as compared to those of previous studies. |
| format | Article |
| id | doaj-art-8459f4820b8343139743c909da1707b5 |
| institution | Kabale University |
| issn | 1023-621X |
| language | English |
| publishDate | 2001-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-8459f4820b8343139743c909da1707b52025-02-03T01:01:38ZengWileyInternational Journal of Rotating Machinery1023-621X2001-01-017318319410.1155/S1023621X01000173Local Heat Transfer and Pressure Drop in a Rotating Two-Pass Ribbed Rectangular ChannelShou-Shing Hsieh0Hsiu-Cheng Liao1Department of Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, TaiwanDepartment of Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, TaiwanThe influences of rotation and uneven heating condition as well as passage aspect ratio on the local heat transfer coefficient and pressure drop in a rotating, two pass ribroughened (rib height e/DH≈0.27; rib pitch p/e=8) rectangular channel with a crosssection aspect ratio of 3 was studied for Reynolds numbers from 5000 to 25,000 and rotation numbers from 0 to 0.24. Regionally averaged Nusselt number variations along the duct have been determined over the trailing and leading surfaces for two pass straight channels and U-bend region. Implementing with the data from Hsieh and Liu (1996) for AR=1 and 1.5 with p/e=5 and e/DH=0.17 and 0.20, passage aspect ratio effect was further examined. Furthermore, data for 180∘ U-bend region with ribroughened turbulator on heat transfer were also measured. It was found that a complicated three-dimensional accelerated flow and secondary flow in this U-bend region caused higher heat transfer on both leading/trailing walls. Enhancement performance ratios are also presented and discussed. Results again indicate a slight decrease in heat transfer coefficient for an increase in passage aspect ratio as compared to those of previous studies.http://dx.doi.org/10.1155/S1023621X01000173Heat transferPressure drop2 pass rotating channelRib turbulator180∘ U-bend. |
| spellingShingle | Shou-Shing Hsieh Hsiu-Cheng Liao Local Heat Transfer and Pressure Drop in a Rotating Two-Pass Ribbed Rectangular Channel International Journal of Rotating Machinery Heat transfer Pressure drop 2 pass rotating channel Rib turbulator 180∘ U-bend. |
| title | Local Heat Transfer and Pressure Drop in a Rotating Two-Pass Ribbed Rectangular Channel |
| title_full | Local Heat Transfer and Pressure Drop in a Rotating Two-Pass Ribbed Rectangular Channel |
| title_fullStr | Local Heat Transfer and Pressure Drop in a Rotating Two-Pass Ribbed Rectangular Channel |
| title_full_unstemmed | Local Heat Transfer and Pressure Drop in a Rotating Two-Pass Ribbed Rectangular Channel |
| title_short | Local Heat Transfer and Pressure Drop in a Rotating Two-Pass Ribbed Rectangular Channel |
| title_sort | local heat transfer and pressure drop in a rotating two pass ribbed rectangular channel |
| topic | Heat transfer Pressure drop 2 pass rotating channel Rib turbulator 180∘ U-bend. |
| url | http://dx.doi.org/10.1155/S1023621X01000173 |
| work_keys_str_mv | AT shoushinghsieh localheattransferandpressuredropinarotatingtwopassribbedrectangularchannel AT hsiuchengliao localheattransferandpressuredropinarotatingtwopassribbedrectangularchannel |