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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Differential diffusion"”.
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Determination of Differential Diffusion Coefficients
Made available in DSpace on 2014-12-05T19:36:14Z (GMT). No. of bitstreams: 1 0013572.pdf: 3012130 bytes, checksum: dcabf19424240df859a0e73079b643fa (MD5) Previous issue date: 1955
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Differential Diffusion of Scalars in Sheared, Stratified Turbulence
To determine why differential diffusion occurs, rapid distortion theory (RDT) is used. To determine where differential diffusion occurs in the target parameter space, laboratory experiments are employed. RDT confirmed previous explanations that differential diffusion occurs because of excess …
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Analysis of gas differential diffusion through porous media using prompt gamma activation analysis
… analysis and later compared to a numerical diffusion model to estimate the effective diffusion coefficient. Numerical simulations using the estimated diffusivity and the experimental argon data produced results with a correlation parameter R² = 0.98. However, neglecting transport mechanisms …
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Study of the role of differential diffusion and equation of state on the features of stably stratified turbulent channel flow using direct numerical simulations
… an equation of state (EoS). The molecular diffusion of the temperature and salinity in such flows differ substantially, which leads to the presence of a differential diffusion phenomenon. This furthers the complexity of stratified turbulence, where the density stratification is known to …
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LARGE EDDY SIMULATION OF TURBULENT HYDROGEN FLAMES
… challenges related to flame stability, strong differential diffusion effects, and increased nitrogen oxides (NOx) emissions. These issues are particularly critical in lean premixed conditions, which are commonly used to limit emissions but lead to complex turbulence-chemistry interactions. This …
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Solution of strained edge flames by a boundary value method
… streamwise pressure gradient in the trailing diffusion flame that affects the edge flame speed. A novel numerical scheme is designed to solve the nonlinear eigenvalue problem based on the variable-density zero Mach number reactive Navier-Stokes equations. It employs a homotopy method to …
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A qualitative multi-level analysis of factors influencing the diffusion and practice of teleworking among employees: insights from within three organisations
… by examining factors which influence the differential diffusion and practice of teleworking within organisations, through contextually-based, multi-level, qualitative research.<br/>Four specific research questions focus the study towards: examination of industry, organisation and job …
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The effect of double diffusion on the dynamics of turbulent plumes and jets
… investigation of the effect of double diffusion on the dynamics of turbulent plumes and jets. Although it consists of seven distinct chapters, the work presented here can be broadly broken down into two parts. The first part addresses the effect of double diffusion on the rate of …
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Numerical Simulation of Unsteady Flows of Physiological Relevance
… of pulsating flow, near wall effects, and differential diffusion effects are not well documented. The effect of wall elasticity on the flow has been assumed to be small but no quatification data exist. There are same basic difficulties in studying physiological flow: The geometries have …
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Predicting Soot Emissions with Advanced Turbulent Reacting Flow Modelling
… the effects of residence time, micromixing and differential diffusion of soot particles. These analyses are necessary to understand the sooting flame structure and act as preparatory investigations for the rest of the thesis. In the second part, a lab-scale swirl flame with addition of dilution …
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Measurements of the structure of turbulent premixed and stratified methane/air flames
The influence of stratification on the structure of turbulent methane/air combustion is investigated using experimental data from laboratory scale burners: a weakly turbulent slot burner, and a higher turbulence co-annular swirl burner. The degree of stratification can be controlled independently …