| Forced Convective Heat Transfer and Pressure Drop of Air Flowing in a Rectangle Duct with Cross-Ribs on the Opposite Walls |
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| 作者姓名： | B.Deng T.T.Wong W.Q.Tao |
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| 作者单位： | B. Deng T. T. Wong W. Q. TaoSchool of Power and Energy，Xi'an Jiaotong University，Xi'an，Shaanxi，ChinaDepartment of Mechanical Engineering，The Hong Kong Polytechnic University，Hung Horn，Kowloon，Hong Kong，Email: wqtao@mail.xjtu.edu.cn |
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| 基金项目： | The work described in this paper has been supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. PolyU 5156/99E). |
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| 摘 要： | Experiments were conducted to investigate the forced convective heat transfer and flow friction of turbulent airflow in a rectangular duct with cross-ribs attached at the two principal walls in the Reynolds number range from 5000 to 40000. The effect of the rib cross angle (45° 60° 75° and the height (4 mm, 5 mm) of the cross-ribs on the forced convection and flow friction were tested. Non-dimensional correlations for the duct average Nusselt number and friction factor of cross-ribs duct were developed from the test data. Experiments were also conducted for the corresponding parallel ribs to compare their relative performance. The experimental results show that both of the convective heat transfer coefficient and friction factor were increased with cross-ribs, with 45°cross-ribs being the best. Compared with parallel ribs normal to the flow direction under identical flow rate and identical pumping power constraints, the cross-ribs can enhance heat transfer in the lower Reynolds number region, while i
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| 收稿时间： | 23 September 2005 |
Forced convective heat transfer and pressure drop of air flowing in a rectangle duct with cross-ribs on the opposite walls |
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| B.Deng
,T.T.Wong
,W.Q.Tao.Forced Convective Heat Transfer and Pressure Drop of Air Flowing in a Rectangle Duct with Cross-Ribs on the Opposite Walls[J].Journal of Thermal Science,2002,11(3):259-270. |
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| Authors: | B Deng T T Wong W Q Tao |
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| Affiliation: | (1) School of Power and Energy, Xi’an Jiaotong University, Xi’an, Shaanxi, China;(2) Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong |
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| Abstract: | Experiments were conducted to investigate the forced convective heat transfer and flow friction of turbulent airflow in a
rectangular duct with cross-ribs attached at the two principal walls in the Reynolds number range from 5000 to 40000. The
effect of the rib cross angle (45°, 60°, 75°) and the height (4 mm, 5 mm) of the cross-ribs on the forced convection and flow
friction were tested. Non-dimensional correlations for the duct average Nusselt number and friction factor of cross-ribs duct
were developed from the test data. Experiments were also conducted for the corresponding parallel ribs to compare their relative
performance. The experimental results show that both of the convective heat transfer coefficient and friction factor were
increased with cross-ribs, with 45° cross-ribs being the best. Compared with parallel ribs normal to the flow direction under
identical flow rate and identical pumping power constraints, the cross-ribs can enhance heat transfer in the lower Reynolds
number region, while in the high Reynolds number region, the heat transfer performance of the parallel ribs seems better. |
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| Keywords: | cross-ribs forced convection heat transfer enhancement |
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