Turbulent flow behaviors on thermal enhancement in a circular tube heat exchanger equipped with sinusoidal baffles
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Abstract
3D numerical computations based on a circular tube heat exchanger with inserted sinusoidal baffles was performed to gain an understanding of its turbulent flow behavior, temperature field and local Nusselt number field which led to an increased heat transfer and thermal enhancement factor. The sinusoidal baffles were inserted at middle of a test tube and behaved as a turbulator. The computations, based on a finite volume method, were performed at Reynolds numbers ranging from 5000 to 20,000. The effect of operating with a PR = 1.0, 2.0, 3.0 and AR = 0.05, 0.10, 0.15, 0.20, 0.25 with sinusoidal baffles was investigated. From the numerical results, the fluid flow was deflected by the sinusoidal baffles and then impinged upon the tube wall. The thermal boundary layer was disrupted and increased the heat transfer along the test tube. Increased AR and decreased PR values led to increased heat transfer and friction factors. The numerical results showed that the sinusoidal baffles yielded higher Nusselt numbers and friction factors than were observed in a plain tube. The heat transfer, friction factor and thermal enhancement factor were greater than the plain tube by approximately 1.7–7.7, 3.6–117 and 1.12–1.9 times, respectively. Operating at PR = 2.0 and AR = 0.20 provided the maximum thermal enhancement factor of 1.9 at Re=5000.
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References
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