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NUMERICAL STUDY OF TURBULENT FLOW AND HEAT TRANSFER CHARACTERISTICS IN PIPES WITH INTERNAL CAVITIES

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NUMERICAL STUDY OF TURBULENT FLOW AND HEAT TRANSFER CHARACTERISTICS IN PIPES WITH INTERNAL CAVITIES

المؤلف: جامعة الملك سعود

الناشر: جامعة الملك سعود

رقم تسلسلي عالمي: 978-003--0000-00-0

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التفاصيل

Using the standard k-e turbulence model, a developing, two-dimensional, turbulent pipe flow was simulated with and without cavities. Effect of cavity shape and concentration on flow and heat transfer characteristics was investigated. Uncertainty was investigated through experimental validation and grid independence. The Reynolds number was fixed at 4.0x104 and the Prandtl number was 0.744. Cavity width and aspect ratio were 0.6 cm and 6, respectively. Pipe diameter was 2 cm and the pipe length-to-diameter ratio was 40. Cavities were created with sharp edges, and were confined within the second half of the pipe. The simulation revealed circulation within the cavities. Cavity boundaries were shown to contribute significantly towards turbulence production. Cavity presence was shown to enhance overall heat transfer, while increasing pressure drop significantly along the pipe. Turbulence was shown to be the major contributor to heat transfer enhancement. Doubling the concentration resulted in roughly doubling both friction factor and heat transfer rate . Increase of both heat transfer and pressure drop with concentration was approximately linear. For the same aspect ratio, round cavities resulted in more heat transfer enhancement and less pressure drop compared to rectangular cavities. Hence, round cavities outperform rectangular cavities in terms of both heat transfer and pressure drop under the conditions of the present study.

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