Research Article Open Access

Simulation of Convective Heat-Transfer Coefficient in a Buried Exchanger

Taoufik Mnasri, Rached Ben Younès, Maher Raddaoui and Salem Elouragini

Abstract

This study presents analytical models allowing to study a forced convection laminar flow in non-established dynamic and thermic regimes. We treated a flow in a bitubular exchanger in permanent thermal contact with a semi-infinite medium, such as the ground. The wall temperature as well as the wall heat flux evolve in the course of time until a quasi-steady mode. The theoretical method is original because it uses Green's functions method to determine the analytical solutions of the heat propagation equation on the wall during the heating phase. These analytical solutions allow to identify the temperature distribution versus time. The complexity of the system geometry as well as the infinity of the medium surrounding the exchanger make the traditional methods of numerical resolution unable to solve the problem. We used, to solve it, the finite volume method coupled with the finite element method at the boundary. We studied the effect of Reynolds number, the fluid entry temperature and the transfer duration on the axial evolution of the heat transfer coefficient. We illustrated also the profile of the temperature field in the fluid medium.

American Journal of Applied Sciences
Volume 5 No. 8, 2008, 927-933

DOI: https://doi.org/10.3844/ajassp.2008.927.933

Submitted On: 1 October 2007 Published On: 31 August 2008

How to Cite: Mnasri, T., Younès, R. B., Raddaoui, M. & Elouragini, S. (2008). Simulation of Convective Heat-Transfer Coefficient in a Buried Exchanger. American Journal of Applied Sciences, 5(8), 927-933. https://doi.org/10.3844/ajassp.2008.927.933

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Keywords

  • Local heat-transfer coefficient
  • non-established regime
  • forced convection
  • exchanger