scholarly journals Heat and mass transfer between gas and solid particles in transverse bed of aerated rotary kiln incinerator.

1994 ◽  
Vol 27 (4) ◽  
pp. 443-448 ◽  
Author(s):  
Yu-Min Chang
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Rotary Kiln ◽  
Solid Particles

scholarly journals Numerical modeling of disperse material evaporation in axisymmetric thermal plasma reactor

2003 ◽  
Vol 7 (1) ◽  
pp. 63-99 ◽  
Author(s):  
Predrag Stefanovic ◽  
Dejan Cvetinovic ◽  
Goran Zivkovic ◽  
Simeon Oka ◽  
Pavle Pavlovic
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Thermal Plasma ◽  
Gas Flow ◽  
Disperse Material ◽  
Plasma Reactor ◽  
Solid Particles ◽  
Reactor Wall ◽  
Particle Injection ◽  
Injection Angle

A numerical 3D Euler-Lagrangian stochastic-deterministic (LSD) model of two-phase flow laden with solid particles was developed. The model includes the relevant physical effects, namely phase interaction, panicle dispersion by turbulence, lift forces, particle-particle collisions, particle-wall collisions, heat and mass transfer between phases, melting and evaporation of particles, vapour diffusion in the gas flow. It was applied to simulate the processes in thermal plasma reactors, designed for the production of the ceramic powders. Paper presents results of extensive numerical simulation provided (a) to determine critical mechanism of interphase heat and mass transfer in plasma flows, (b) to show relative influence of some plasma reactor parameters on solid precursor evaporation efficiency: 1 - inlet plasma temperature, 2 - inlet plasma velocity, 3 - particle initial diameter, 4 - particle injection angle a, and 5 - reactor wall temperature, (c) to analyze the possibilities for high evaporation efficiency of different starting solid precursors (Si, Al, Ti, and B2O3 powder), and (d) to compare different plasma reactor configurations in conjunction with disperse material evaporation efficiency.

The nonlinear dynamics of solidification of a binary melt with a quasi-equilibrium mushy region

1990 ◽  
Vol 68 (9) ◽  
pp. 790-793 ◽  
Author(s):  
Yu. A. Buyevich ◽  
L. Y. Iskakova ◽  
V. V. Mansurov
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Volume Fraction ◽  
Solid Phase ◽  
Internal Heat ◽  
Solid Particles ◽  
Mushy Region ◽  
Parameter Method ◽  
Quasi Equilibrium ◽  
Phase Volume Fraction

A mushy region (a two-phase zone) between the solid and liquid phases occurs often in the process of solidification of a binary melt. An analysis of the structure of the mushy region, which includes the liquid, solid particles, and dendrites extending from the bulk solid surface, is suggested. The processes of heat and mass transfer in the mushy region are considered on the basis of the small parameter method. The analysis leads to equations governing unsteady heat and mass transfer with internal heat, and mass sources within the mushy region, and it includes the condition for the absence of supercooling (the condition for the zone quasi-equilibrium), convection being neglected. The temperature, concentration of solute, and solid phase volume fraction are found. On the basis of this solution a new model of the process is formulated. Within the scope of this model the mushy region is replaced by a liquid–solid interface with discontinuous boundary conditions.

scholarly journals SIMULATION OF HEAT AND MASS TRANSFER PROCESSES UNDER GRANULES CAPSULATION IN FLUIDIZED BED

2018 ◽  
Vol 61 (4-5) ◽  
pp. 98
Author(s):  
Andrey A. Lipin ◽  
Vladimir O. Nebukin ◽  
Aleksandr G. Lipin
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Fluidized Bed ◽  
Residence Time ◽  
Solid Particles ◽  
Process Time ◽  
Coating Film ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
The Impact

The paper studies capsulation of solid particles in a spout fluidized bed. A capsulation is used to protect the particles surface from the negative impact of environmental factors as well as to regulate of active component release rate. In this work, the capsulation is carried out by spraying of polymers dispersions on fluidized bed particles by means of pneumatic nozzles. Drops of polymer dispersion having faced with the particles are spred on their surface, forming a liquid film. Solvent removing by drying causes solidification of the film. Existing calculation methods of capsulation in the apparatuses with fluidized bed have a significant disadvantage. They do not consider the impact of capsule formation on the heat and mass transfer process of the solvent removing from the coating film. Combined modeling these processes allows more accurately predicting the required residence time of the capsulated material in the apparatus. The mathematical model, which allows predicting the change in coverage degree, the moisture content, the temperature of the particles in process time as well as required residence time in the apparatus, was developed. The comparison of the calculated and experimental data shows their good agreement. Taking into account the changes in evaporation surface due to the increasing of particles coverage degree in the capsulation process allows to describe the evolution of the particles parameters more adequately and to select of the process rational parameters.Forcitation:Lipin A.A., Nebukin V.O., Lipin A.G. Simulation of heat and mass transfer processes under granules capsulation in fluidized ber. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 4-5. P. 98-104

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