THE PHYSICAL ASPECT OF THREE-DIMENSIONAL MIXED CONVECTION IN A UNIFORMLY HEATED HORIZONTAL PIPE
Keywords:
horizontal pipe / uniform heating / laminar mixed convection / numerical simulationAbstract
This study concerns the numerical simulation of the three dimensional forced and mixed convection
heat transfer in a uniformly horizontal heated pipe. The complete Navier-Stokes equations are
numerically solved with a finite volume method.. The obtained results show that the mixed convection
flow is quite three-dimensional. As the Grashof number is increased, a secondary flow develops in the
form of a two counter-rotating vortices. The vortices lead to a better mixing of the flow and thus enhance
the convective heat transfer: the local axial Nu decreases along an entrance region and then increases
downstream instead of leveling off as in the case of forced convection. The increase is more important for
higher Richardson numbers
Downloads
References
Mori Y., Futagami K., Tokuda S., "Nakamura N., Forced
convective heat transfer in uniformly heated horizontal
tube", 1st report experimental study on the effect of
buoyancy, Int. J. Heat Mass Transfer, Vol.9, (1966), pp.
-463.
- Shannon R.L., Depew C.A., "Combined free and forced
laminar convection in a horizontal tube with uniform heat
flux", ASME J. Heat Transfer, Vol.90, (1968), pp.353-357
- Shannon R.L., Depew C.A., "Forced laminar flow
convection in a horizontal tubes with variable viscosity and
free convection effects", ASME J. Heat Transfer, Vol. 91,
(1969), pp. 251-258.
- Hussaïn N.A., McComas S.T., "Experimental Investigation
of combined convection in a horizontal circular tube with
uniform heat flux", Proceedings of the Fourth Int. Heat
Transfer Conf., Elseiver, Amsterdam, Vol. 4 (1970), NC 3.4.
- Pethukhov B.S., Polyakov A.F., "Flow and heat transfer in
horizontal tubes under combined effect of forced and free
convection", Proceedings of the Fourth Int. Heat Transfer
Conf., Elsevier, Amsterdam, Vol. 4 (1970), NC 3.7.
- Bergles A.E., Simonds R.R., "Combined forced and free
convection for laminar flow in horizontal tubes with uniform
heat flux", Int. J. Heat Mass Transfer, Vol. 14, (1971), pp.
-2000.
- Hong S.W., Morcos S.M., Bergles A.E., "Analytical and
experimental results for combined forced and free laminar
convection in horizontal tubes", Proc. of the Fifth Int. Heat
Transfer Conf., Tokyo, Vol. 3 (1974), pp. 154-158.
- Morcos S.M., Bergles A.E., "Experimental investigation of
combined forced and free laminar convection in horizontal
tubes", ASME J. Heat Transfer, Vol.97, (1975), pp. 212-219.
- Abid C., Papini F., Ropke A., Veyret D., "Etude de la
convection mixte dans un conduit cylindrique. Approche
analytique / numérique et détermination expérimentale de la
température de paroi par thermographie infrarouge", Int. J.
Heat Mass Transfer, Vol.37, (1994), pp. 91-101.
- Newell Jr. P.H., Bergles A.E., "Analysis of combined free
and forced convection for fully developed laminar flow in
horizontal tubes", ASME J. Heat Transfer, Vol.92, (1970),
pp. 83-93.
- Patankar S.V., Ramadhyani E., Sparrow E.M., "Effect of
circumferentially non uniform heating on laminar combined
convection in a horizontal tube", ASME J. Heat Transfer,
Vol.100, (1978), pp. 63-70.
- Law H.S., Masliyah J.H., Nandakumar V., "Effect of non
uniform heating on laminar mixed convection in ducts",
ASME J. Heat Transfer, Vol.109, (1987) pp.131-137.
- Ouzzane M. et Galanis N., "Effets de la conduction pariétale
et de la répartition du flux thermique sur la convection mixte
près de l’entrée d’une conduite inclinée", Int. J. Thermal
Sciences, Vol.38, (1999), pp. 622-633.
- Patankar S.V., "Numerical Heat Transfer and Fluid Flow",
Mc Graw Hill, New-York, (1980).
- Polyakov A.F., "Mixed Convection in Single-Phase Flows",
in O.G. Martynenko and A. A. Zukauskas (eds.), Heat
Transfer: Soviet Reviews, Convective Heat Transfer,Vol.1,
Hemisphere, Washington, D.C, (1989) pp.1-95.
- Cebeci T., Bradshaw P., "Physical and Computational
Aspects of Convective Heat Transfer", Springer-Verlag,
New-York, (1984).
