Spelling suggestions: "subject:"[een] CONVECTION"" "subject:"[enn] CONVECTION""
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Thermal convection in porous media with application to hydrothermal circulation in the oceanic crustFulford, James Kenny 05 1900 (has links)
No description available.
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The influence of silica precipitation and thermoelastic stresses on the evolution of a ridge crest seafloor hydrothermal systemMartin, Jeffrey T. 12 1900 (has links)
No description available.
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Heat and mass transfer in combined convection.Crotogino, Reinhold Hermann. January 1971 (has links)
No description available.
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Double-diffusive convection flow in porous media with cross-diffusion.Awad, Faiz G. January 2011 (has links)
In this thesis we study double-diffusive convection and cross-diffusion effects in flow
through porous media. Fluid flows in various flow geometries are investigated and
the governing equations are solved analytically and numerically using established
and recent techniques such as the Keller-box method, the spectral-homotopy analysis
method and the successive linearisation method. The effects of the governing parameters
such as the Soret, Dufour, Lewis, Rayleigh and the Peclet numbers and the
buoyancy ratio on the fluid properties, and heat and mass transfer at the surface are
determined. The accuracy, computational efficiency and validity of the new methods
is established.
This study consists of five published and one submitted paper whose central theme is
the study of double-diffusive convection in porous media. A secondary theme is the
application of recent numerical semi-numerical methods in the solution of nonlinear
boundary value problems, particularly those that arise in the study of fluid flow
problems.
Paper 1. An investigation of the quiescent state in a Maxwell fluid with double-diffusive
convection in porous media using linear stability analysis is presented. The
fluid motion is modeled using the modified Darcy-Brinkman law. The critical Darcy-
Rayleigh numbers for the onset of convection are obtained and numerical simulations
carried out to show the effects of the Soret and Dufour parameters on the critical
Darcy-Rayleigh numbers. For some limiting cases, known results in the literature are
recovered.
Paper 2. We present an investigation of heat and mass transfer in a micropolar fluid
with cross-diffusion effects. Approximate series solutions of the governing non-linear
differential equations are obtained using the homotopy analysis method (HAM). A
comparison is made between the results obtained using the HAM and the numerical
results obtained using the Matlab bvp4c numerical routine.
Paper 3. The spectral homotopy analysis method (SHAM) as a new improved version
of the homotopy analysis method is introduced. The new technique is used to solve
the MHD Jeffery-Hamel problem for a convergent or divergent channel. We show
that the SHAM improves the applicability of the HAM by removing the restrictions
associated with the HAM as well as accelerating the convergence rate.
Paper 4. We present a study of free and forced convection from an inverted cone
in porous media with diffusion-thermo and thermo-diffusion effects. The highly nonlinear
governing equations are solved using a novel successive linearisation method
(SLM). This method combines a non-perturbation technique with the Chebyshev
spectral collection method to produce an algorithm with accelerated and assured
convergence. Comparison of the results obtained using the SLM, the Runge-Kutta
together with a shooting method and the Matlab bvp4c numerical routine show the
accuracy and computational efficiency of the SLM.
Paper 5. Here we study cross-diffusion effects and convection from inverted smooth
and wavy cones. In the case of a smooth cone, the highly non-linear governing
equations are solved using the successive linearisation method (SLM), a shooting
method together with a Runge-Kutta of order four and the Matlab bvp4c numerical
routine. In the case of the wavy cone the governing equations are solved using the
Keller-box method.
Paper 6. We examine the problem of mixed convection, heat and mass transfer along
a semi-infinite plate in a fluid saturated porous medium subject to cross-diffusion and
radiative heat transfer. The governing equations for the conservation of momentum,
heat and solute concentration transfer are solved using the successive linearisation
method, the Keller-box technique and the Matlab bvp4c numerical routine. / Thesis (Ph.D.)-University of KwaZulu-Natal, Pietermaritzburg, 2011.
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On convection and flow in porous media with cross-diffusion.Khidir, Ahmed A. January 2012 (has links)
In this thesis we studied convection and cross-diffusion effects in porous media.
Fluid flow in different flow geometries was investigated and the equations for momentum, heat and mass transfer transformed into a system of ordinary differential
equations using suitable dimensionless variables. The equations were solved using a
recent successive linearization method. The accuracy, validity and convergence of the
solutions obtained using this method were tested by comparing the calculated results
with those in the published literature, and results obtained using other numerical
methods such as the Runge-Kutta and shooting methods, the inbuilt Matlab bvp4c
numerical routine and a local non-similarity method.
We investigated the effects of different fluid and physical parameters. These
include the Soret, Dufour, magnetic field, viscous dissipation and thermal radiation
parameters on the fluid properties and heat and mass transfer characteristics.
The study sought to (i) investigate cross-diffusion effects on momentum, heat and
mass transport from a vertical flat plate immersed in a non-Darcy porous medium
saturated with a non-Newtonian power-law fluid with viscous dissipation and thermal
radiation effects, (ii) study cross-diffusion effects on vertical an exponentially stretching surface in porous medium and (iii) apply a recent hybrid linearization-spectral
technique to solve the highly nonlinear and coupled governing equations. We further
sought to show that this method is accurate, efficient and robust by comparing it with established methods in the literature.
In this study the non-Newtonian behaviour of the fluid is characterized using the
Ostwald-de Waele power-law model. Cross-diffusion effects arise in a broad range
of fluid flow situations in many areas of science and engineering. We showed that
cross-diffusion has a significant effect on heat and mass-transfer processes and cannot
be neglected. / Thesis (Ph.D.)-University of KwaZulu-Natal, Pietermaritzburg, 2012.
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Radiatively induced ignition of PMMA in the presence of forced convectionKoski, Jennifer Rose 12 1900 (has links)
No description available.
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Energy stability of thermocapillary convection in liquid bridges with a deformed free surfaceSumner, Loren Bryan Stout 05 1900 (has links)
No description available.
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An experimental investigation of droplet impact cooling at controlled surface temperaturesWang, Jianwei 05 1900 (has links)
No description available.
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Transient free convection in a closed container with heating at the bottom and at the sidesTatom, John Wilbur 05 1900 (has links)
No description available.
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Thermal convection within superheated liquid metal cavitiesRastegar, Freidoon 08 1900 (has links)
No description available.
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