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Investigation on evaluation criteria of axial wall heat conduction under two classical thermal boundary conditions

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  • Lin, Mei
  • Wang, Qiu-Wang
  • Guo, Zhixiong

Abstract

Investigation to evaluate axial wall heat conduction has been conducted for heat transfer in a laminar flow circular tube with two classical thermal boundary conditions at the outside wall. The tube ends are either adiabatic or with heat losses. The simulation is three-dimensional with various wall materials, wall thicknesses and tube lengths. A wide range of Peclet number from 7 to 14,000 is considered. Three evaluation criterion parameters including the axial conduction number, the modified axial conduction number, and the temperature gradient number are comprehensively studied to quantify the influence of axial wall heat conduction. Under the constant outside wall temperature boundary condition, the temperature gradient number is presented to assess the relevance of the axial wall heat conduction. The approximate range of the effect of axial wall heat conduction on the local Nusselt number for the fully developed flow is also obtained.

Suggested Citation

  • Lin, Mei & Wang, Qiu-Wang & Guo, Zhixiong, 2016. "Investigation on evaluation criteria of axial wall heat conduction under two classical thermal boundary conditions," Applied Energy, Elsevier, vol. 162(C), pages 1662-1669.
    • Handle: RePEc:eee:appene:v:162:y:2016:i:c:p:1662-1669
    DOI: 10.1016/j.apenergy.2015.04.099
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    References listed on IDEAS

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    1. Adelaja, Adekunle O. & Dirker, Jaco & Meyer, Josua P., 2014. "Effects of the thick walled pipes with convective boundaries on laminar flow heat transfer," Applied Energy, Elsevier, vol. 130(C), pages 838-845.
    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.
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    Cited by:

    1. Saranmanduh Borjigin & Ting Ma & Min Zeng & Qiuwang Wang, 2018. "A Numerical Study of Small-Scale Longitudinal Heat Conduction in Plate Heat Exchangers," Energies, MDPI, vol. 11(7), pages 1-15, July.

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