This paper describes the experimental and numerical study of three mildly twisted square ducts (twisted uniform cross section square duct, twisted divergent square duct and twisted convergent square duct). Experiments are conducted for air with uniform heat flux condition. Measurements are also conducted for a straight untwisted square duct for comparison purpose. Numerical simulations are performed for three-dimensional and fully elliptic flow and heat transfer by using a body-fitted finite volume method and standard −ε turbulence model. Both experimental and numerical results show that the twisting brings about a special variation pattern of the spanwise distribution of the local heat transfer coefficient, while the divergent and convergent shapes lead to different axial local heat transfer distributions. Based on the test data, the thermal performance comparisons are made under three constraints (identical mass flow rate, identical pumping power and identical pressure drop) with straight untwisted square duct as a reference. Comparisons show that the twisted divergent duct can always enhance heat transfer, the twisted convergent duct always deteriorates heat transfer, and the twisted constant cross section duct is somewhat in between.
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Experimental and Numerical Study of Turbulent Heat Transfer in Twisted Square Ducts
Liang-Bi Wang,
Liang-Bi Wang
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, PRC
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Wen-Quan Tao,
Wen-Quan Tao
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, PRC
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Qiu-Wang Wang,
Qiu-Wang Wang
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, PRC
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Ya-Ling He
Ya-Ling He
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, PRC
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Liang-Bi Wang
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, PRC
Wen-Quan Tao
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, PRC
Qiu-Wang Wang
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, PRC
Ya-Ling He
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, PRC
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division October 3, 2000; revision received March 23, 2001. Associate Editor: M. Faghri.
J. Heat Transfer. Oct 2001, 123(5): 868-877 (10 pages)
Published Online: March 23, 2001
Article history
Received:
October 3, 2000
Revised:
March 23, 2001
Citation
Wang, L., Tao , W., Wang , Q., and He, Y. (March 23, 2001). "Experimental and Numerical Study of Turbulent Heat Transfer in Twisted Square Ducts ." ASME. J. Heat Transfer. October 2001; 123(5): 868–877. https://doi.org/10.1115/1.1389464
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