Cover
Vol. 11 No. 1 (2011)

Published: May 31, 2011

Pages: 31-43

Original Article

Influence Of Wall Axial Heat Conduction On The Forced Convection Heat Transfer In Rectangular Channels

Mushtaq Ismael Hasan 1
1 Mech. Eng. Dept., College of Engineering, Thi-Qar University
History
  • Received: February 28, 2011
  • Available Online: May 31, 2011
DOI

https://doi.org/10.33971/bjes.11.1.3

Abstract

In this paper the conjugate heat transfer in rectangular channel is numerically investigated, where the effect of both axial heat conduction and entrance region on the internal forced convection in rectangular channels are studied. With decreasing the dimensions of channels the thickness of walls become large and in order of the channels dimensions as in microchannels. As a results the heat conduction in the walls especially in the axial direction can not be ignored, since it lead to decrease in the efficiency of heat transfer process. Also the effect of entrance region is taken into consideration where the flow is assumed developing hydro dynamically and thermally. A finite volume method is used to numerically solve the conjugate heat transfer in both the fluid and wall simultaneously. The results obtained shows that the existing of axial heat conduction lead to reduction in the heat transfer and it's effect increased with increasing the thickness of walls and Reynolds number. In this paper a correlation has been developed to calculate the value of axial heat conduction in channel's walls based on most of the affecting parameters. This correlation can be used accurately to compute the value of axial conduction in rectangular channels.

References

  1. Barbaros C., Almila G. Y., Sadik K., " fluid flow in microtubes with axial conduction including rarefaction and viscous dissipation", Int. J. of Heat and Mass Transfer, 34, pp. 535-544, 2008.
  2. Poh Seng Lee, Suresh V. G., Dong L., " Investigation of heat transfer in rectangular microchannels ", Int. Journal of heat and Mass Transfer, 48 (9), pp. 1688 - 1704, 2005.
  3. Jun Yao, Mayur K. P., Yufeng Y., Peter J. M., " Numerical simulation of heat transfer in rectangular microchannel ", European Conference on Computational Fluid Dynamics ECCOMAS CFD, TU Delft, Netherlands, 2006.
  4. Tiselj I., Hetsroni G., Mavko B., Mosyak A., Pogrebnyak E., Segal Z., " Effect of axial conduction on the heat transfer in micro-channels " ,Int. Journal of Heat and Mass Transfer, 47 (12), pp. 2551- 2565, 2004.
  5. Zhigang Liu, Yaohua Z., Masahiro T., " Experimental study on axial wall heat conduction for convective heat transfer in stainless steel microtube ", Springer , Heat Mass Transfer, 43 (6), pp. 587 - 594, 2007.
  6. A. Haji-Sheikh, J. V. Beck, Donald E. Amos, " Axial heat conduction effects in the entrance region of parallel plate ducts', ", Int. J. of Heat and Mass Transfer, 51, pp. 5811-5822, 2008.
  7. Wei G., Darin W. N., " An experimental study of axial conduction through a thermosyphon pipe wall", J. of Applied Thermal Engineering, 29, pp. 3536-3541, 2009.
  8. Incropera .Frank P., Dewitt David P., " Fundamentals of heat and mass transfer " 4th Edition, Jhon Wiley and sons, 1996.
  9. Patankar, S.V., "Numerical heat transfer and fluid flow", Hemisphere Publishing Corporation, 1980.
  10. Weilin Q., Issam M., "Thermal design methodology for high heat flux single phase and two phase microchannel heat sinks", IEEE Trans. Components and Packaging Technologies 26 (2003) 598-609.