Flow structure, heat transfer and pressure drop in varying aspect ratio two-pass rectangular smooth channels |
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Authors: | Waseem Siddique Lamyaa El-Gabry Igor V Shevchuk Narmin B Hushmandi Torsten H Fransson |
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Institution: | (1) Department of Energy Technology, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden;(2) Department of Mechanical Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad, Pakistan;(3) Department of Mechanical Engineering, American University in Cairo (AUC), Cairo, Egypt;(4) MBtech Group GmbH & Co. KGaA, Salierstr. 38, 70736 Fellbach-Schmiden, Germany |
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Abstract: | Two-pass channels are used for internal cooling in a number of engineering systems e.g., gas turbines. Fluid travelling through
the curved path, experiences pressure and centrifugal forces, that result in pressure driven secondary motion. This motion
helps in moving the cold high momentum fluid from the channel core to the side walls and plays a significant role in the heat
transfer in the channel bend and outlet pass. The present study investigates using Computational Fluid Dynamics (CFD), the
flow structure, heat transfer enhancement and pressure drop in a smooth channel with varying aspect ratio channel at different
divider-to-tip wall distances. Numerical simulations are performed in two-pass smooth channel with aspect ratio Win/H = 1:3 at inlet pass and Wout/H = 1:1 at outlet pass for a variety of divider-to-tip wall distances. The results show that with a decrease in aspect ratio
of inlet pass of the channel, pressure loss decreases. The divider-to-tip wall distance (Wel) not only influences the pressure drop, but also the heat transfer enhancement at the bend and outlet pass. With an increase
in the divider-to-tip wall distance, the areas of enhanced heat transfer shifts from side walls of outlet pass towards the
inlet pass. To compromise between heat transfer and pressure drop in the channel, Wel/H = 0.88 is found to be optimum for the channel under study. |
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