scholarly journals Analysis of Entropy Production in Structured Chemical Reactors: Optimization for Catalytic Combustion of Air Pollutants

Entropy ◽  
2020 ◽  
Vol 22 (9) ◽  
pp. 1017 ◽  
Author(s):  
Mateusz Korpyś ◽  
Anna Gancarczyk ◽  
Marzena Iwaniszyn ◽  
Katarzyna Sindera ◽  
Przemysław J. Jodłowski ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Entropy Production ◽  
Heat And Mass Transfer ◽  
Chemical Reaction ◽  
Catalytic Combustion ◽  
Packed Bed ◽  
Optimization Criterion ◽  
Rational Solutions ◽  
Short Channel ◽  
Flow Friction

Optimization of structured reactors is not without some difficulties due to highly random economic issues. In this study, an entropic approach to optimization is proposed. The model of entropy production in a structured catalytic reactor is introduced and discussed. Entropy production due to flow friction, heat and mass transfer and chemical reaction is derived and referred to the process yield. The entropic optimization criterion is applied for the case of catalytic combustion of methane. Several variants of catalytic supports are considered including wire gauzes, classic (long-channel) and short-channel monoliths, packed bed and solid foam. The proposed entropic criterion may indicate technically rational solutions of a reactor process that is as close as possible to the equilibrium, taking into account all the process phenomena such as heat and mass transfer, flow friction and chemical reaction.

scholarly journals A Study of Steady Buoyancy-Driven Dissipative Micropolar Free Convection Heat and Mass Transfer in a Darcian Porous Regime with Chemical Reaction

2007 ◽  
Vol 12 (2) ◽  
pp. 157-180 ◽  
Author(s):  
O. Anwar Bég ◽  
R. Bhargava ◽  
S. Rawat ◽  
H. S. Takhar ◽  
Tasweer A. Bég
Keyword(s):  
Mass Transfer ◽  
Velocity Field ◽  
Heat And Mass Transfer ◽  
Chemical Reaction ◽  
Reaction Rate ◽  
Near Field ◽  
Packed Bed ◽  
Darcy Number ◽  
Reaction Model ◽  
Chemical Reaction Rate

In the present paper we examine the steady double-diffusive free convective heat and mass transfer of a chemically-reacting micropolar fluid flowing through a Darcian porous regime adjacent to a vertical stretching plane. Viscous dissipation effects are included in the energy equation. Assuming incompressible, micro-isotropic fluid behaviour the transport equations are formulated in a two-dimensional coordinate system (x, y) using boundary-layer theory. The influence of the bulk porous medium retardation is modeled as a drag force term in the translational momentum equation. Transformations render the conservation equations into dimensionless form in terms of a single independent variable, η, transverse to the stretching surface. A simplified first order homogenous reaction model is also used to simulate chemical reaction in the flow. Using the finite element method solutions are generated for the angular velocity field, translational velocity field, temperature and species transfer fields. The effects of buoyancy, porous drag and chemical reaction rate are studied. Chemical reaction is shown to decelerate the flow and also micro-rotation values, in particular near the wall. Mass transfer is also decreased with increasing chemical reaction rate. Increasing Darcy number is shown to accelerate the flow. Applications of the study include cooling of electronic circuits, packed-bed chemical reactors and also the near field flows in radioactive waste geo-repositories.

Unsteady MHD Flow of a Casson Fluid in a Parallel Plate Channel With Heat And Mass Transfer of Chemical Reaction

2012 ◽  
Vol 3 (2) ◽  
pp. 101-105 ◽  
Author(s):  
C. K. Kirubhashankar C. K. Kirubhashankar ◽  
◽  
S.Ganesh S.Ganesh
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Chemical Reaction ◽  
Parallel Plate ◽  
Mhd Flow ◽  
Casson Fluid ◽  
Plate Channel

Heat and Mass Transfer During Gas Absorption with Simultaneous Second-Order Chemical Reaction

2007 ◽  
Vol 38 (4) ◽  
pp. 339-349 ◽  
Author(s):  
Ryszard Pohorecki ◽  
E. Molga ◽  
W. Moniuk
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Chemical Reaction ◽  
Second Order ◽  
Gas Absorption ◽  
Order Chemical Reaction

EFFECTS OF CHEMICAL REACTION ON THIRD-GRADE MHD FLUID FLOW UNDER THE INFLUENCE OF HEAT AND MASS TRANSFER WITH VARIABLE REACTIVE INDEX

2019 ◽  
Vol 50 (11) ◽  
pp. 1061-1080 ◽  
Author(s):  
Ambreen Afsar Khan ◽  
Syeda Rida Bukhari ◽  
Marin Marin ◽  
Rahmat Ellahi
Keyword(s):  
Mass Transfer ◽  
Fluid Flow ◽  
Heat And Mass Transfer ◽  
Chemical Reaction ◽  
Third Grade

Unsteady MHD Free Convective Heat and Mass Transfer Flow Past a Vertical Porous Plate in the Presence of Radiation and Chemical Reaction

2017 ◽  
Vol 6 (10) ◽  
pp. 116
Author(s):  
J. Buggaramulu ◽  
M. Venkatakrishna ◽  
Y. Harikrishna
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Convective Heat ◽  
Chemical Reaction ◽  
Porous Plate ◽  
Physical Parameters ◽  
Governing Equations ◽  
Vertical Porous Plate ◽  
Flow Past ◽  
Transfer Flow

The objective of this paper is to analyze an unsteady MHD free convective heat and mass transfer boundary flow past a semi-infinite vertical porous plate immersed in a porous medium with radiation and chemical reaction. The governing equations of the flow field are solved numerical a two term perturbation method. The effects of the various parameters on the velocity, temperature and concentration profiles are presented graphically and values of skin-frication coefficient, Nusselt number and Sherwood number for various values of physical parameters are presented through tables.

MHD stagnation point flow heat and mass transfer of nanofluids in porous medium with radiation, viscous dissipation and chemical reaction

2016 ◽  
Vol 27 (2) ◽  
pp. 742-749 ◽  
Author(s):  
F. Mabood ◽  
S. Shateyi ◽  
M.M. Rashidi ◽  
E. Momoniat ◽  
N. Freidoonimehr
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Heat And Mass Transfer ◽  
Stagnation Point ◽  
Viscous Dissipation ◽  
Chemical Reaction ◽  
Stagnation Point Flow ◽  
Flow Heat
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