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Turbulent heat transfer and pressure loss in a square channel with discrete broken V-rib turbulators

Journal of Hydrodynamics 2016年第2期28卷 275-283页

作者： promthaisong pitak Eiamsa-ard PETPICES Jedsadaratanachai WITHADA Eiamsa-ard SMITH Faculty of Engineering Mahanakorn University of Technology Faculty of Industrial Technology Phetchaburi Rajabhat University Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang

Turbulent periodic flow, heat transfer, friction loss and thermal enhancement characteristics in a three-dimensional horizo- ntal square channel with broken V-ribs （B-VR） are numerically investigated. The computations are based on the finite volume method, and the SIMPLE algorithm with QUICK scheme is implemented. The B-VR were installed on both sides of a plate which was diagonally placed in a square channel to produce longitudinal vortex flows through the tested section. Effects of different open comer ratios （ d/H = 0, 0.01, 0.02, 0.03, 0.04 and 0.05） on heat transfer and pressure loss in the channel and the results of the B-VR are studied. The pitch ratio （PR = p/H） and blockage ratio （BR = p/H） of B-VRs were fixed at 1.0 and 0.15, respectively. As compared with the channel without V-rib, the one with B-VRs possessed considerably higher heat transfer and friction loss. It is observed that apart from the rise of Reynolds number, the reduction of the open comer ratios leads to an increase in the Nusselt number and friction factor due to the weaker turbulence and lower resistance to the flow. According to the computational results for B-VRs, the optimum thermal enhancement is fotmd at d/H = 0.

关键词： channel periodic flow heat transfer friction loss broken V-ribs

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Heat transfer in turbulent tube flow inserted with loose-fit multi-channel twisted tapes as swirl generators

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Theoretical & Applied Mechanics Letters 2017年第6期7卷 372-378页

作者： Suttisak Kunlabud Varesa Chuwattanakul Vichan Kongkaitpaiboon pitak promthaisong Smith Eiamsa-ard Faculty of Engineering Mahanakorn University of TechnologyBangkokThailand Faculty of Engineering King Mongkut's Institute of Technology LadkrabangBangkokThailand

Heat transfer and flow behaviors in three-dimensional circular tubes with loose-fit multiple channel twisted tapes were numerically studied. The investigation was examined for Reynolds numbers （Re） ranging from 5000 to 15,000, by using air as testing fluid. Effects of the multiple channel number （N = 2, 3, and 4）, clearance ratio （CR = 0.0, 0.025, 0.05, and 0.075） on heat transfer enhancement and flow friction were examined. The numerical results indicate that the tubes with loose-fit multiple channel twisted tapes perform higher heat transfer rates than the plain tube. The enhanced heat transfer rate is escorted with larger pressure drop. Both heat transfer and pressure drop increase with increasing multiple channel number （N） and decreasing clearance ratio （CR）. Heat transfer augmented by the loose-fit multiple channel twisted tape with N = 4 is higher than those enhanced by the ones with N = 2 and 3 by around 9.5-17.8% and 5.8-7.8%, respectively. In addition, the loose-fit multiple channel twisted tapes with clearance ratio of 0.025, 0.05, and 0.075 give lower heat transfer rates than the one with CR = 0.0 by around 8.4%, 17.5%, and 28.8%, respectively.

关键词： Heat transfer Heat transfer enhancement Loose-fit multiple channel twisted tape Swirling flow

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