Diffusion-thermo and thermal-diffusion effects in transient and steady natural convection from a vertical surface



Diffusion in Hypersonic Flows
Gür, Hilmi Berk; Eyi, Sinan (Nova Science Pub Inc, 2020-10-01)
In hypersonic flows, air goes into chemical reaction due to high temperature. Therefore, in addition to the Navier-Stokes Equations, chemical reaction equations need to be solved to analyze hypersonic flows. A model may be need to simulate the diffusion phenomena among chemical species. It is possible to implement Fick's Law of Diffusion as well as Stefan-Maxwell Diffusion Equation. Basically, in Fick's Law of Diffusion, the driving force is the species concentration differences. This method is similar to t...
Diffusion Effect on Hypersonic Flow Using Fick’s Law
Gür, Berk; Eyi, Sinan (2015-07-27)
Diffusion and reaction in catalyst pellets with bidisperse pore size distribution
Doğu, Timur (1998-06-01)
Catalysts with bidisperse pore structures are extensively used in chemical industries. In such catalysts, diffusion and reaction in the microporous particles are preceded by diffusion in the macropores. The relative significance of macro-and micropore diffusion resistances on the observed reaction rates with Linear and nonlinear rate forms, heat effects, catalyst deactivation and selectivity problems in bidisperse catalysts are investigated in number of published works. In this article, a review of the mode...
Diffusion models implementation in hypersonic flow regimes
Gür, Berk; Eyi, Sinan (null; 2017-09-20)
This study highlights the diffusion phenomena in hypersonic flow regimes. It is an important event that has to be define in the flow field solutions. There are two famous diffusion model; Fick’s Law of Diffusion and Stefan-Maxwell Diffusion Equation. Both are included in the calculations. The model differences are observed both physically and mathematically. Finally, their results are examined for each of the species.
Diffusion Resistances and Contribution of Surface Diffusion in TAME and TAEE Production Using Amberlyst-15
Doğu, Timur; Boz, Nezahat; MÜRTEZAOĞLU, KIRALİ; DOĞU, GÜLŞEN (2003-01-01)
Effective diffusivities and adsorption equilibrium constants of methanol, ethanol and 2-methyl-2-butene (2M2B), in Amberlyst 15, were evaluated from batch adsorption experiments. Moment expressions derived for different models involving diffusion resistances in the macropores and within the gel-like micrograins were used for the evaluation of effective diffusion coefficients. Contribution of surface diffusion to diffusion flux within the macropores was found to be quite significant. Also, it was found that ...
Citation Formats
Z. Dursunkaya, “Diffusion-thermo and thermal-diffusion effects in transient and steady natural convection from a vertical surface,” International Journal of Heat and Mass Transfer, pp. 2060–2065, 1992, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28190.