Analysis of Thermal and Resistance Characteristics of Fixed-Bed Regenerator with Small D/dp Ratio
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Date
2016-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present thesis investigates the performance of the Fixed-bed regenerator from the study of inertial, viscous resistance and thermal characteristics of the packed bed regenerator with small D/dp ratios. The Ergun’s equation has been accepted widely to calculate the pressure drop in the thermal regenerator with its two coefficients, 150 and 1.75. Revised Ergun’s equation is achieved for thermal fixed-bed regenerator with new coefficients, 294 and 0.72. The values of coefficients of Ergun’s equation calculated by simulation are compared with the experimental results and are fond in good agreement. The thermal characteristics of the regenerator are studied by using 3-D transient model. The variation of pressure drop, temperature, effectiveness, velocity along the regenerator bed is studied and presented. With the help of mathematical modeling of regenerator codes are written in MATLAB software to evaluate various parameters of design of the fixed- bed regenerator. Regenerator length, switching time, thermal mean residence time and various other design parameters for maximum single-pass efficiency, maximum heat storage factor and maximum thermal efficiency of fixed-bed regenerator are calculated. The thesis also presents the 3D, CFD modelling and analysis of unsteady flow through a fixed-bed regenerator. Fixed-bed regenerator having particle to diameter ratio (D/dp) 3, 8, 12 were used to analyse the flow complexities and thermal characteristics of the regenerator. To study the detailed flow complexities within these vicinities commercial Ansys Fluent 14.0 software is used. The predicted results of pressure drop and wall effect were compared with the previous experimental results and a good agreement found between them.
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