Numerical study of instability in a horizontal porous channel with bottom heating and forced horizontal flow

1998 ◽  
Vol 10 (9) ◽  
pp. 2198-2207 ◽  
Author(s):  
Françoise Dufour ◽  
Marie-Christine Neel
Keyword(s):  
Numerical Study ◽  
Horizontal Flow ◽  
Porous Channel ◽  
Bottom Heating

Non-Newtonian Casson pulsatile fluid flow influenced by Lorentz force in a porous channel with multiple constrictions: A numerical study

2021 ◽  
Vol 33 (1) ◽  
pp. 79-90 ◽  
Author(s):  
Amjad Ali ◽  
Attia Fatima ◽  
Zainab Bukhari ◽  
Hamayun Farooq ◽  
Zaheer Abbas
Keyword(s):  
Fluid Flow ◽  
Lorentz Force ◽  
Numerical Study ◽  
Porous Channel

Numerical Investigation of a Crossflow Jet in a Rectangular Microchannel

2013 ◽  
Vol 284-287 ◽  
pp. 849-853
Author(s):  
Kok Cheong Wong
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Performance ◽  
Numerical Study ◽  
Three Dimensional ◽  
Horizontal Flow ◽  
Transfer Performance ◽  
Rectangular Microchannel ◽  
Transverse Jet ◽  
Nozzle Position ◽  
Jet Nozzle

The present numerical study is conducted in three dimensional to investigate the crossflow of an external round jet and a horizontal stream of microchannel flow. The results of heat transfer performance for the cases with and without transverse jet are compared. The patterns of different crossflow jet were analyzed to understand the flow and heat transfer characteristics. The effect of jet nozzle position on the heat transfer is investigated. Generally, the heat transfer performance increases with the jet Reynolds number. However, some cases of weak jet are found to cause lower heat transfer rate relative to the case without external jet. When vertical weak jet encounter strong horizontal flow, the horizontal flow is dominant that the jet cannot reach the microchannel bottom wall but imposes resistance to the horizontal flow. The investigation on the jet nozzle location shows that the jet nozzle location closer to the channel inlet gives better heat transfer performance.

Forced Convection in a Porous Channel With Localized Heat Sources

1994 ◽  
Vol 116 (2) ◽  
pp. 465-472 ◽  
Author(s):  
A. Hadim
Keyword(s):  
Heat Transfer ◽  
Porous Medium ◽  
Pressure Drop ◽  
Heat Source ◽  
Forced Convection ◽  
Numerical Study ◽  
Porous Channel ◽  
Heat Sources ◽  
Porous Layers ◽  
Channel Configuration

A numerical study is performed to analyze steady laminar forced convection in a channel filled with a fluid-saturated porous medium and containing discrete heat sources on the bottom wall. Hydrodynamic and heat transfer results are reported for two configurations: (1) a fully porous channel, and (2) a partially porous channel, which contains porous layers above the heat sources and is nonporous elsewhere. The flow in the porous medium is modeled using the Brinkman-Forchheimer extended Darcy model. Heat transfer rates and pressure drop are evaluated for wide ranges of Darcy and Reynolds numbers. Detailed results of the evolution of the hydrodynamic and thermal boundary layers are also provided. The results indicate that as the Darcy number decreases, a significant increase in heat transfer is obtained, especially at the leading edge of each heat source. For fixed Reynolds number, the length-averaged Nusselt number reaches an asymptotic value in the Darcian regime. In the partially porous channel, it is found that when the width of the heat source and the spacing between the porous layers are of the same magnitude as the channel height, the heat transfer enhancement is almost the same as in the fully porous channel while the pressure drop is significantly lower. These results suggest that the partially porous channel configuration is a potentially attractive heat transfer augmentation technique for electronic equipment cooling, an end that motivated this study.

Gradient Layer Entrainment in a Thermohaline System With Mixed Layer Circulation

1986 ◽  
Vol 108 (4) ◽  
pp. 267-274 ◽  
Author(s):  
F. P. Incropera ◽  
C. E. Lents ◽  
R. Viskanta
Keyword(s):  
Flow Visualization ◽  
Mixed Layer ◽  
Fluid Velocity ◽  
Horizontal Flow ◽  
Entrainment Rate ◽  
Dimensionless Parameters ◽  
Buoyancy Flow ◽  
Shear Mechanism ◽  
Bottom Heating ◽  
Layer Flow

Entrainment of salt-stratified fluid into a bottom mixed layer is investigated under conditions for which mixing is driven by bottom heating and/or an imposed horizontal flow. Entrainment rate measurements and mixed layer flow visualization suggest that entrainment is strongly influenced by a shear mechanism involving both horizontal and vertical fluid velocity components. Under certain conditions, imposition of the horizontal flow inhibits the buoyancy flow and entrainment rates for combined mixing are less than those for pure buoyant mixing. Attempts to correlate entrainment rates in terms of conventional dimensionless parameters were unsuccessful.

Numerical Study of Pulsating Flow Frequency and Heat Transfer in Porous Channel Heat Sink

2013 ◽  
Vol 455 ◽  
pp. 470-473
Author(s):  
Chao Wang ◽  
Shang Long Xu ◽  
Yun Chuan Wu
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Nusselt Number ◽  
Pressure Drop ◽  
Numerical Study ◽  
Porous Channel ◽  
Channel Network ◽  
Temperature Distributions ◽  
Constant Wall Heat Flux ◽  
Flow Through

A study has been conducted on the heat transfer of various oscillatory frequencies of pulsation flow through a porous channel network subjected to a constant wall heat flux. The surface temperature distributions, pressure drop, unit thermal resistance and local Nusselt number for different oscillatory frequencies were mainly investigated.

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