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Linear and weakly nonlinear stability of mixed convection boundary layersMoresco, Pablo Diego January 2000 (has links)
No description available.
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Geometric location and power distribution for discrete heat sources on a vertical flat plate with natural convectionJung, Inyeop 08 November 2011 (has links)
The current development of consumer electronics, driven by the effort to manufacture smaller products with increased performance, has amplified the chance for inducing higher thermal stresses to these systems. In an effort to devise more effective cooling methods for these systems, many scholars have studied the convective cooling of discrete heating elements.
This report discusses a methodology for fabricating and testing a suitable flat plate design with discrete heating elements for both natural and forced convection cooling experiments. There were two plate design attempts: (i) an aluminum plate and (ii) a R3315 hydrostatic-resistance plastic foam plate. For the purpose of conducting experiments for the discrete heating elements, the foam plate design was found to be an appropriate design.
After designing a proper foam plate, several experiments were conducted for the natural convection case. The combination of parameters such as the geometric location and power output ratio between heaters that resulted in the maximum thermal conductance were studied. / text
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Modelling of Heat Transfer for Convection-boosted Flat Vertical Radiator Surfaces : An investigation of how heat transfer is influenced by radiator height and freestream air velocityScheibe, Oskar January 2017 (has links)
In this thesis, a calculation model is created to study a theoretical radiator-like configuration, consisting of a flat vertical plate heated with a constant capacity rate. This lumped capacitance model is partly created to more theoretically look at radiators with add-on-fans, but also to in such a setting look at fundamental heat transfer relationships. System heat transfer is studied for various heights, H (m), and freestream velocities, u (m/s). These results are then subject to validation, where comparison is made with values derived from two relevant reference studies. It is found that polynomial fits well describe the results obtained from calculation. The relationships for heat transfer Q (W), heat flux q (W/m2) thus become: 𝑄(𝐻,𝑢) = 𝑎00 + 𝑎01𝑢 + 𝑎10𝐻 + 𝑎11𝐻𝑢 + 𝑎02𝑢2 (W) 𝑞(𝐻,𝑢) =𝑄/𝐻= 𝑎00𝐻-1 + 𝑎01𝐻-1𝑢 + 𝑎10 + 𝑎11𝑢 + 𝑎02𝐻-1𝑢2 (W/m2) For these relationships, polynomial coefficients 𝑎00, 𝑎01, 𝑎10, 𝑎11 and 𝑎02 are found for three temperature set-ups of system supply and return temperature at zero freestream velocity: 55/45, 45/35 and 35/25 (°C). These values are chosen as they correspond to standard temperatures for low-temperature heating set-ups. Model validation is successful for the case of natural convection (u = 0), whereas difficulties are encountered for the cases of mixed and forced convection. Reasons for these difficulties are discussed and it is concluded that there is a need for more experimental studies of flat vertical plates with non-isothermal wall temperature profiles.
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Interaction of Natural Convection and Real Gas Radiation Over a Vertical Flat PlateHale, Nathan 17 August 2023 (has links) (PDF)
This study explores natural convection heat transfer and fluid flow from a vertical plate in a radiating gas accounting for real gas spectral behavior. Finite volume techniques are used to solve the coupled nonlinear partial differential equations for mass, momentum, and energy conservation, while radiation transfer is modeled using the Discrete Ordinates finite volume finite angle method. Real gas spectral behavior is accounted for using the Rank Correlated Spectral Line Weighted-sum-of-gray-gases method. It is found that gas temperature and velocity are higher in the boundary layer, thickening the thermal and hydrodynamic boundary layers compared to the limiting case of pure convection. Gas species and concentration significantly impact boundary layer development, affecting radiative heating, temperature, velocity, and wall heat fluxes. Wall radiation transport dominates over convective transport. Increasing the wall temperature for the same wall-quiescent surroundings temperature difference increases local radiative heating, temperature, and velocity, and results in higher wall heat fluxes. As Rayleigh number increases, convection gains importance relative to radiation. Higher total gas pressures moderately increase radiative heating, temperature, and velocity, while reducing wall heat fluxes and convective transport. Increased wall emissivity raises radiative heating, temperature, and velocity, while raising wall heat flux and reducing convective flux. It is concluded that the neglect of participating gas radiation effects can result in significant errors in the predicted flow and thermal behavior, and the total transport. These insights advance understanding of radiation-convection interplay in radiating gas scenarios.
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Numerical analysis of unsteady MHD mixed conversion flow past an infinite vertical plate in the presence of Dufour and Soret effects with viscous dissipationMukwevho, Nancy 18 May 2018 (has links)
MSc (Mathematics) / Department of Mathematcs and Applied Mathematics / Magnetohydrodynamics
ows have gained signi cant attention due to their importance
in engineering applications. In this study, we numerically analysed the Dufour and Soret
e ects on an unsteady MHD mixed convection
ow past an in nite vertical plate with
viscous dissipation. The governing non-linear partial di erential equations (PDEs) are
transformed into a system of ordinary di erential equations (ODEs) by the suitable
similarity transformations. The resulting equations consist of the momentum, energy and
mass di usion equations. These resulting equations are solved using the Spectral Local
Linearization Method (SLLM). Results obtained by the SLLM are in good agreement
with the bvp4c technique. The e ects of di erent physical parameters entering into the
problem are displayed graphically. The values of the Skin-friction (f0(0)), Nusselt number
( 0(0)) and Sherwood number ( 0(0)) are shown in tabular form for di erent values of
the parameters. From the results, it is noted that the Soret number (Sr) and the Dufour
number (Du) have negligible e ects on temperature pro le, whereas the decrease in the
Soret number (Sr) leads to a decrease in both velocity and concentration of the
uid, and
the increase in Dufour number (Du) reduces the velocity and also has negligilbe e ect on
the concentration pro le. / NRF
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