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Two important problems are studied: the combustion of hydrocarbons at higher pressures and the burning of hydrocarbon/water-vapor mixtures both of which are relevant to many applications including diesel combustion and hydrate fuels. To study both of these problems, a numerical analysis of a steady laminar methane-air counterflow diffusion flame at high pressure is presented. The mathematical model...
The movement of impurities and point defects in materials plays a key role in determining their rheological properties, both by permitting diffusional creep and by allowing recovery by dislocation climb. Impurity and point defect diffusion can also control the kinetics of phase transitions and grain growth, and can determine the rate of chemical equilibration between phases. Thus the study of point...
The well known square root formula for the kinetics of adsorption by spherical particle U(t)=(6/r0)(Dt/π)1/2 is only valid in the early stage of adsorption (U(t) ≤0.3), where U(t) shows fractional attainment to the equilibrium. Present study shows that with a little manipulation of this formula, its application range can be extended to U(t) ≤0.95. The suggested formula U(t)=(6/r0)(Dt/π)1/2-(3Dt/r0...
Arsenic is a toxic element and may be found in natural waters as well as in industrial waters, which requires proper treatment before its use as drinking water. Present investigation aims to remove arsenate ions [As(V)] by bone char. Effect of solution pH, initial concentration, and contact time has been investigated. Kinetics reveal that removal of As(V) ion by bone char is very rapid in the first...
A theoretical model is presented for the coupling of diffusion, migration and chemical equilibrium during the voltammetric reduction of weak polyprotic acids. The dissociation reaction of a neutral acid is assumed to influence only the apparent diffusion coefficients of the hydrogen ion and its conjugate base anions. For typical values of equilibrium constants of dissociation reactions and analytical...
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