Experimental Study on Heat Transfer of Water/TiO2 Nanofluid in a Straight Tube with Twisted Tapes at Constant Wall Temperature

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Abstract

One of the methods for increasing convective heat transfer is by utilizing twisted tapes in heat exchangers which increases surface to volume of heat transfer and also improves augmentation of fluid flow. In the past research, the combined effects of nanofluid and twisted tapes were not studied. In this research paper, the heat transfer performance of water/TiO2 nanofluid in a heat exchanger with twisted tape insert is evaluated. The studied parameters are pitch of twisted tape, mass flow rate, and concentration of nanofluid. The constant wall temperature is employed and the range of Reynolds number is from 3000 to 22000. Experiments were performed for the volumetric concentration range of . The results confirm that heat transfer was enhanced by adding nano-particles. Also, the results were repeated by adding twisted tapes with lower pitches. The maximum heat transfer appraisal indicates a 103.45 percent increase for the concentration of 0.5 and the insert of the twisted tape with (H/D=5).

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References

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Journal of Solid and Fluid Mechanics
Volume 5, Issue 3 - Serial Number 3
September and October 2015
Pages 165-172

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