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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.2017018645
pages 155-174

NUMERICAL SIMULATIONS OF FLOW STRUCTURE AND TURBULENT HEAT TRANSFER IN A SQUARE RIBBED CHANNEL WITH VARYING RIB PITCH RATIO

Aayan Khalid
School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, China
Gongnan Xie
Department of Mechanical and Power Engineering, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, China
Bengt Sunden
Division of Heat Transfer, Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100, Lund, Sweden

ABSTRACT

In the fast development of advanced gas turbines with increasing output power, the inlet temperature is accordingly increased. Traditional cooling techniques failed to deal with such situations; however, new cooling techniques incorporating ribbed microchannels with higher capability of heat removal are required. In the present research, a square ribbed channel with various rib pitch ratios is designed to regulate the most optimum configuration for augmenting heat transfer rates to diminish pressure drop consequences. The inlet Reynolds number used for the microchannels varies from 20,000 to 160,000. Four different configurations of six continuous ribs are mounted on one wall by varying height and distance between the ribs. By using computational fluid dynamics with the v2f turbulence model and a constant wall heat flux as the boundary condition on the surfaces, temperature field, local heat transfer, normalized heat transfer, and thermal performance are acquired. The overall performances of four tested ribbed microchannels are evaluated and compared. Numerical results predict that the use of increasing rib pitch ratio in the same channel (case 3) is an appropriate design for enhancing heat transfer and reducing pressure loss. Although it has a lower friction factor compared to other cases, it gives the best performance of heat transfer enhancement. It is suggested that the ribbed microchannels with varying rib pitch ratio can increase the overall heat transfer performance.


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