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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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Turbulent forced convection in a heat exchanger square channel with wavy-ribs vortex generator

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Chinese Journal of Chemical Engineering 2015年第8期23卷 1256-1265页

作者： Amnart Boonloi withada jedsadaratanachai Department of Mechanical Engineering Technology College of Industrial TechnologyKing Mongkut's University of Technology North Bangkok Department of Mechanical Engineering Faculty of EngineeringKing Mongkut's Institute of Technology Ladkrabang

Turbulent forced convective heat transfer and flow con figurations in a square channel with wavy-ribs inserted diagonally are examined numerically. The in fluences of the 30° and 45° flow attack angles for wavy-ribs, blockage ratio, R B= b/H = 0.05–0.25 with single pitch ratio, R P= P/H = 1 are investigated for the Reynolds number based on the hydraulic diameter of the square channel, Re = 3000–20000. The use of the wavy-ribs, which inserted diagonal in the square channel, is aimed to help to improve the thermal performance in heat exchange *** finite volume method and SIMPLE algorithm are applied to the present numerical simulation. The results are presented on the periodic flow and heat transfer pro files, flow con figurations, heat transfer characteristics and the performance evaluations. The mathematical results reveal that the use of wavy-ribs leads to a higher heat transfer rate and friction loss over the smooth channel. The heat transfer enhancements are around 1.97–5.14 and 2.04–5.27 times over the smooth channel for 30° and 45° attack angles, respectively. However, the corresponding friction loss values for 30° and 45° are around 4.26–86.55 and 5.03–97.98 times higher than the smooth square channel, respectively. The optimum thermal enhancement factor on both cases is found at R B= 0.10 and the lowest Reynolds number, Re = 3000, to be about 1.47 and 1.52, respectively, for 30° and 45° wavy-ribs.

关键词： Flow configuration Forced convection Heat transfer characteristic Turbulent flow Wavy-ribs

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3D numerical study on flow structure and heat transfer in a circular tube with V-baffles

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Chinese Journal of Chemical Engineering 2015年第2期23卷 342-349页

作者： withada jedsadaratanachai Nuthvipa Jayranaiwachira Pongjet Promvonge Department of Mechanical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang

A 3D numerical investigation has been carried out to examine periodic laminar flow and heat transfer characteristics in a circular tube with 45°V-baffles with isothermal *** computations are based on the finite volume method(FVM),and the SIMPLE algorithm has been *** fluid flow and heat transfer characteristics are presented for Reynolds numbers ranging from 100 to *** generate main longitudinal vortex flows through the tested section,V-baffles with an attack angle of 45°are mounted in tandem and in-line arrangement on the opposite positions of the circular *** of tube blockage ratio,flow direction on heat transfer and pressure drop in the tube are *** is apparent that a pair of longitudinal twisted vortices(P-vortex)created by a V-baffle can induce impingement on a wall of the inter-baffle cavity and lead a drastic increase in heat transfer rate at tube *** addition,the larger blockage ratio results in the higher Nusselt number and friction factor *** computational results show that the optimum thermal enhancement factor is around 3.20 at baffle height of B=0.20 and B=0.25 times of the tube diameter for the V-upstream and V-downstream,respectively.

关键词： Periodic flow Tube Laminar flow Heat transfer Pressure loss V-baffle

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