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Heat transfers and pressure drops for porous-ring turbulators in a circular pipe

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  • Akansu, Selahaddin Orhan

Abstract

A numerical heat-transfer and pressure-drop analysis is presented for porous rings inserted in a pipe at a distance L apart. A constant heat-flux is applied to the outer surface of the pipe. Numerical calculations are conducted with the Fluent 6.1.22 code, using the shear-stress transport (SST) k-[omega] model. Air is the fluid. The heat-transfer increase is analyzed for Reynolds numbers from 3 x 103 to 45 x 103. The porous-ring height is taken as H = 1 or 2 mm. The distance between two porous rings is 0.5D, D or 2D where D is the inside diameter of the pipe. An increase in L/D caused a decrease in heat-transfer. High Nusselt numbers were obtained when H/D and L/D ratios were 0.4 and 0.5, respectively, for a Reynold number of 45,000. The maximum Nusselt number occurred when L/D = 1 if H/D is selected as 0.2.

Suggested Citation

  • Akansu, Selahaddin Orhan, 2006. "Heat transfers and pressure drops for porous-ring turbulators in a circular pipe," Applied Energy, Elsevier, vol. 83(3), pages 280-298, March.
    • Handle: RePEc:eee:appene:v:83:y:2006:i:3:p:280-298
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    References listed on IDEAS

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    Cited by:

    1. Jiaqiang, E. & Zhao, Xiaohuan & Liu, Haili & Chen, Jianmei & Zuo, Wei & Peng, Qingguo, 2016. "Field synergy analysis for enhancing heat transfer capability of a novel narrow-tube closed oscillating heat pipe," Applied Energy, Elsevier, vol. 175(C), pages 218-228.
    2. Ozceyhan, Veysel & Gunes, Sibel & Buyukalaca, Orhan & Altuntop, Necdet, 2008. "Heat transfer enhancement in a tube using circular cross sectional rings separated from wall," Applied Energy, Elsevier, vol. 85(10), pages 988-1001, October.
    3. Yılmaz, İbrahim Halil & Mwesigye, Aggrey, 2018. "Modeling, simulation and performance analysis of parabolic trough solar collectors: A comprehensive review," Applied Energy, Elsevier, vol. 225(C), pages 135-174.
    4. Sheikholeslami, M. & Ganji, D.D., 2016. "Heat transfer enhancement in an air to water heat exchanger with discontinuous helical turbulators; experimental and numerical studies," Energy, Elsevier, vol. 116(P1), pages 341-352.
    5. Ma, Ting & Wang, Qiu-wang & Zeng, Min & Chen, Yi-tung & Liu, Yang & Nagarajan, Vijaisri, 2012. "Study on heat transfer and pressure drop performances of ribbed channel in the high temperature heat exchanger," Applied Energy, Elsevier, vol. 99(C), pages 393-401.
    6. Muthusamy, C. & Srithar, K., 2017. "Energy saving potential in humidification-dehumidification desalination system," Energy, Elsevier, vol. 118(C), pages 729-741.
    7. Duan, Jimiao & Gong, Jing & Yao, Haiyuan & Deng, Tao & Zhou, Jun, 2014. "Numerical modeling for stratified gas–liquid flow and heat transfer in pipeline," Applied Energy, Elsevier, vol. 115(C), pages 83-94.
    8. Sheikholeslami, Mohsen & Gorji-Bandpy, Mofid & Ganji, Davood Domiri, 2015. "Review of heat transfer enhancement methods: Focus on passive methods using swirl flow devices," Renewable and Sustainable Energy Reviews, Elsevier, vol. 49(C), pages 444-469.

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