Journal ArticleDOI
Numerical simulation of laminar mixed convection in the entrance region of horizontal rectangular ducts
Frank P. Incropera,J. A. Schutt +1 more
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In this paper, a laminar, three-dimensional, steady-state model has been solved to determine the nature and effect of thermally driven secondary flows in, a horizontal channel with heated top and bottom surfaces and insulated side walls.Abstract:
A laminar, three-dimensional, steady-state model has been solved to determine the nature and effect of thermally driven secondary flows in, a horizontal channel with heated top and bottom surfaces and insulated side walls. The secondary flow is characterized by ascending and descending thermals that form longitudinal vortex rolls and enhance the bottom surface heat transfer and channel friction factor by as much as 400 and 30%, respectively. Parametric calculations have been performed to determine the effect on hydrodynamic and thermal conditions of Reynolds number (100 ≤ Re ≤. 1000), Grashof number (2.5 × 105 ≤ Gr∗ ≤ 6.5 × 104), Prandtl number (Pr = 6.5 and 0.7), top-to-bottom surface heat flux ratio (−1.0 ≤ q1/qb ≤ 5.0), aspect ratio (1 ≤ A ≤ 10), and entrance velocity profile. Conditions near the bottom surface are characterized by mixed convection and are unaffected by heating at the top surface. Conversely, conditions at the top surface are dominated by forced convection and are unaffected by heating...read more
Citations
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Journal ArticleDOI
Experiments on mixed convection heat transfer for airflow in a horizontal and inclined channel
J.R. Maughan,Frank P. Incropera +1 more
TL;DR: In this article, the effect of surface heat flux and channel orientation on the local Nusselt number was studied for Pr = 0.7, 125 3 6, and 0.
Journal ArticleDOI
Return flows in horizontal MOCVD reactors studied with the use of TiO2 particle injection and numerical calculations
TL;DR: In this paper, the formation of return flows was systematically studied as a function of pressure, flow velocity and temperature, and it was shown that return flows can occur at the leading edge of the heated susceptor.
Journal ArticleDOI
Development of laminar mixed convection flow in a horizontal rectangular duct with uniform bottom heating
TL;DR: In this paper, the effects of buoyancy-induced secondary flow on forced flow in a horizontal rectangular duct with uniform bottom heating were evaluated numerically using a vectorized finite-difference marching technique.
Journal ArticleDOI
Numerical investigation of mixed convection heat transfer in a horizontal channel with a built-in square cylinder
TL;DR: In this article, the authors investigated the structure of laminar wakes and heat transfer in the presence of thermal buoyancy art in a two-dimensional horizontal channel with a built-in square cylinder and showed that mixed convection can initiate periodicity and asymmetry in the wake at lower Reynolds numbers than forced convection alone.
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Regions of heat transfer enhancement for laminar mixed convection in a parallel plate channel
J.R. Maughan,Frank P. Incropera +1 more
TL;DR: In this article, heat transfer enhancement in mixed convection flow between parallel plates heated uniformly from below is investigated, and the onset of secondary flow is found to precede appreciable heat transfer enhancements.
References
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Book
Numerical heat transfer and fluid flow
TL;DR: In this article, the authors focus on heat and mass transfer, fluid flow, chemical reaction, and other related processes that occur in engineering equipment, the natural environment, and living organisms.
Journal ArticleDOI
A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows
S.V. Patankar,D. B. Spalding +1 more
TL;DR: In this article, a general, numerical, marching procedure is presented for the calculation of the transport processes in three-dimensional flows characterised by the presence of one coordinate in which physical influences are exerted in only one direction.
Book
Convective Heat and Mass Transfer
W. M. Kays,J. H. Whitelaw +1 more
TL;DR: In this article, the echangeurs de : chaleur, couche de : limite, modeles de : turbulence, transfert de masse reference record created on 2005-11-18, modified on 2016-08-08