An equipment for mass and heat transfer to a film of liquid flowing down a plane surface. I. Design and basic hydrodynamic data

1972 ◽  
Vol 37 (11) ◽  
pp. 3719-3724
Author(s):  
V. Kolář ◽  
M. Endršt
Keyword(s):  
Heat Transfer ◽  
Plane Surface ◽  
Mass And Heat Transfer ◽  
Hydrodynamic Data

scholarly journals Confined fluidised bed porosity in the light of bubbling-bed models

2012 ◽  
Vol 33 (3) ◽  
pp. 431-444
Author(s):  
Piotr Zabierowski
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Transfer Rate ◽  
Model Parameters ◽  
Fluidised Bed ◽  
Gas Velocity ◽  
Bed Porosity ◽  
Bubbling Bed ◽  
Mass And Heat Transfer ◽  
Hydrodynamic Data

Abstract Based on hydrodynamic data, Kato-Wen and Kunii-Levenspiel bubbling-bed model parameters, supplemented with assumptions characteristic for tested confined fluidised bed, were analysed. The calculated bubble diameters and the bed composition proved essential influence of inter-particle space of packed compacted component onto fluidisation character. The usability of the conducted model analysis was also confirmed. Finally, it can be concluded that Kunii-Levenspiel and Kato- Wen models with characteristic assumptions (for the tested bed) can be applied for calculation of the confined fluidised bed layer porosity. Discrepancies of ε f value, determined on the basis of the above mentioned bubbling-bed models do not exceed 8% of the error. The model parameters obtained from the matching the model relations to experimental data εf = f(u0) allow an analysis of the fluidisation character as well as gas velocity regime and the fluidised bed structural composition identification. A description of the regime of the process in which confined fluidised bed is characterised with an increase of mass and heat transfer rate is also possible using relation (17) derived in the present study.

scholarly journals Mass and Heat Transfer Coefficients in Automotive Exhaust Catalytic Converter Channels

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 507
Author(s):  
Chrysovalantis C. Templis ◽  
Nikos G. Papayannakos
Keyword(s):  
Heat Transfer ◽  
Flow Reactor ◽  
Catalytic Converter ◽  
Reaction Rates ◽  
Cfd Model ◽  
Automotive Exhaust ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Wide Range ◽  
Mass And Heat Transfer

Mass and heat transfer coefficients (MTC and HTC) in automotive exhaust catalytic monolith channels are estimated and correlated for a wide range of gas velocities and prevailing conditions of small up to real size converters. The coefficient estimation is based on a two dimensional computational fluid dynamic (2-D CFD) model developed in Comsol Multiphysics, taking into account catalytic rates of a real catalytic converter. The effect of channel size and reaction rates on mass and heat transfer coefficients and the applicability of the proposed correlations at different conditions are discussed. The correlations proposed predict very satisfactorily the mass and heat transfer coefficients calculated from the 2-D CFD model along the channel length. The use of a one dimensional (1-D) simplified model that couples a plug flow reactor (PFR) with mass transport and heat transport effects using the mass and heat transfer correlations of this study is proved to be appropriate for the simulation of the monolith channel operation.

Diffusion Mass and Heat Transfer in a Plane Axisymmetric Layer of a Magnetic Fluid

2020 ◽  
Vol 93 (3) ◽  
pp. 509-518
Author(s):  
V. G. Bashtovoi ◽  
A. G. Reks ◽  
P. P. Kuzhir ◽  
A. Yu. Zubarev ◽  
V. S. Moroz
Keyword(s):  
Heat Transfer ◽  
Magnetic Fluid ◽  
Mass And Heat Transfer ◽  
Diffusion Mass
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