scholarly journals Mass and heat transfer intensification at the wall of a square agitated vessel by chemically active semicylindrical turbulence promoters

2021 ◽  
Vol 60 (5) ◽  
pp. 4775-4786
Author(s):  
Ahmed S. Fathalla ◽  
Nevine K. Amin ◽  
El-Sayed Z. El-Ashtoukhy ◽  
Gomaa H. Sedahmed
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Intensification ◽  
Agitated Vessel ◽  
Mass And Heat Transfer

Mass and heat transfer at an array of horizontal cylinders placed at the bottom of a square agitated vessel

2015 ◽  
Vol 94 ◽  
pp. 449-455 ◽  
Author(s):  
N.M. Atef ◽  
M.H. Abdel-Aziz ◽  
Y.O. Fouad ◽  
H.A. Farag ◽  
G.H. Sedahmed
Keyword(s):  
Heat Transfer ◽  
Agitated Vessel ◽  
Mass And Heat Transfer ◽  
Horizontal Cylinders

The Effect of Regulating Elements on Convective Heat Transfer along Shaped Heat Exchange Surfaces

2013 ◽  
Vol 34 (1) ◽  
pp. 5-16 ◽  
Author(s):  
Jozef Cernecky ◽  
Jan Koniar ◽  
Zuzana Brodnianska
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Cfd Simulation ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Temperature Fields ◽  
Transfer Coefficients ◽  
Heat Transfer Intensification ◽  
Heat Transfer Coefficients ◽  
Forced Air

Abstract The paper deals with a study of the effect of regulating elements on local values of heat transfer coefficients along shaped heat exchange surfaces with forced air convection. The use of combined methods of heat transfer intensification, i.e. a combination of regulating elements with appropriately shaped heat exchange areas seems to be highly effective. The study focused on the analysis of local values of heat transfer coefficients in indicated cuts, in distances expressed as a ratio x/s for 0; 0.33; 0.66 and 1. As can be seen from our findings, in given conditions the regulating elements can increase the values of local heat transfer coefficients along shaped heat exchange surfaces. An optical method of holographic interferometry was used for the experimental research into temperature fields in the vicinity of heat exchange surfaces. The obtained values correspond very well with those of local heat transfer coefficients αx, recorded in a CFD simulation.

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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