Topic
Mass transfer coefficient
About: Mass transfer coefficient is a research topic. Over the lifetime, 7827 publications have been published within this topic receiving 168354 citations.
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TL;DR: In this paper, the authors used analytical solutions for regular geometries (infinite slab, infinite cylinder and sphere) to experimentally determine heat and mass transfer coefficient and diffusion coefficient values.
50 citations
TL;DR: In this article, the authors presented the modeling of an adsorption process applied to textile dyes, using fixed bed columns. And the experimental conditions were simulated using a transient mathematical model, with variations in feed rate, feed concentration, diameter of the column and mass transfer coefficient.
50 citations
TL;DR: In this article, a semi-empirical transient model for a flat plate under forced convection conditions was proposed to predict the temperature and thickness of the frost layer using existing correlations for the convective heat transfer coefficient and the Lewis analogy.
Abstract: This paper models the frost formation process employing a semi-empirical transient model for a flat plate under forced convection conditions. This continuous differential model employs the Euler's method to solve for the temperature and thickness of the frost layer using existing correlations for the convective heat transfer coefficient and the Lewis analogy to compute both a mass transfer coefficient and an enthalpy transfer coefficient. The model is also based on empirical correlations for predicting the frost thermal conductivity and density. Model results are compared with existing experimental data and with numerical data of other investigators and are found to agree very well in the applicable temperature and humidity range of the frost density and conductivity correlations.
50 citations
TL;DR: In this paper, experimental investigation of the drying kinetics of various types of materials was carried out in laboratory-scale dryers under different conditions of temperature, microwave heating power and pressure.
Abstract: Experimental investigation of the drying kinetics of various types of materials was carried out in laboratory-scale dryers under different conditions of temperature, microwave heating power and pressure. Leather samples (mechanically and vacuum-dewatered bull napa and wet blue cutting), paperboards (grafopack, testliner), wood (alder, birch, willow) and two pharmaceutical powders (chlorpropamide and hydrochlorotiazide) were dried in a microwave dryer. Thin clay slabs, Al–Ni catalyst and chlorpropamide were dried in a convection dryer, while chlorpropamide and ketoprofen were dried in a vacuum dryer. In order to compare drying kinetics, experimentally obtained data, X = f(t), were correlated with the Lewis “thin-layer” equation, the modified Page equation and Fick's second law. The drying constant, effective diffusion coefficient, mass transfer coefficient and modified Page model parameters were estimated by fitting the selected mathematical models to experimental data. High levels of correlation between measured and calculated data were obtained for all materials and dryers using modified Page model. The application of the Lewis and Fick's equation is justified only for drying of clay, catalyst and leather. Mass transfer coefficient depends linearly on the drying constant. The relation between the modified Page model parameter and the drying constant can be represented by a unique power function.
50 citations
TL;DR: Analytical expressions for the time invariant, average mass transfer coefficient and the concentration boundary layer thickness applicable to dissolving single-component nonaqueous phase liquid (NAPL) pools in two-dimensional, saturated, homogeneous and isotropic porous formations are derived.
50 citations