scholarly journals Reconstruction of three-dimensional temperature fields in micro-fixed bed reactor based on infrared thermography and thermal probe method

AIP Advances ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 065326
Author(s):  
Shengwang Guan ◽  
Yihua Zheng
Keyword(s):  
Infrared Thermography ◽  
Fixed Bed ◽  
Three Dimensional ◽  
Probe Method ◽  
Fixed Bed Reactor ◽  
Temperature Fields ◽  
Thermal Probe

Heat Transfer inside Elliptic Cylindrical Reactor: Effect of Bed Porosity

2013 ◽  
Vol 336 ◽  
pp. 97-102
Author(s):  
A.A. Silva Filho ◽  
J.P. Silva de Almeida ◽  
Antônio Gilson Barbosa de Lima
Keyword(s):  
Heat Transfer ◽  
Fixed Bed ◽  
Three Dimensional ◽  
Axial Direction ◽  
Cylindrical Geometry ◽  
Heat Diffusion ◽  
Fixed Bed Reactor ◽  
Three Dimensional Model ◽  
Variable Porosity ◽  
Steady State Heat Transfer

The study of heat transfer phenomenon in porous media by fluids percolated in the axial direction has been of interest to many researchers in various branches of science and technology. Applications are directed to different process such as filtration, distillation, absorption and adsorption in columns, drying and catalytic reactions in fixed beds. The literature has presented several solutions of the heat diffusion / convection equation in fixed bed reactors, but these studies are limited to a cylindrical geometry. In this sense, this work aim to present a pseudo-homogeneous three-dimensional model to describe the steady-state heat transfer within a fixed bed reactor with elliptic cylindrical geometry by considering variable porosity. The energy equation written in elliptical cylindrical coordinates and applied to the porous medium (particulate system) is discretized numerically using the finite volume method. Results of the temperature distribution within the bed are presented analyzed. It was verified that with increased porosity heat transfer inside the reactor tends to be more intense and thus, lower temperature gradients are found in all cross section of the reactor.

CFD Simulation of a Methane Steam Reforming Reactor

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Mohammad Taghi Sadeghi ◽  
Mazaher Molaei
Keyword(s):  
Skin Temperature ◽  
Steam Reforming ◽  
Methane Conversion ◽  
Cfd Simulation ◽  
Fixed Bed ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Fixed Bed Reactor ◽  
Methane Steam Reforming ◽  
Tehran Refinery

An industrial steam reforming reactor producing hydrogen is simulated using the three-dimensional Computational Fluid Dynamics (CFD) technique. The fixed bed reactor is filled with a nickel oxide catalyst. Effects of operating conditions such as temperature and steam to methane ratio on the reformer performance are investigated. Simulation results show that a steam to carbon ratio of more than 4 increases in the ratio does not have a notable influence on methane yield. Moreover, it shows that methane conversion is strongly affected by reactor skin temperature and higher skin temperature leads to an increase in the methane conversion. The results were successfully validated with industrial data obtained from a hydrogen plant at a Tehran refinery.

scholarly journals Three-Dimensional Reconstruction of Thermal Volumetric Sources from Surface Temperature Fields Measured by Infrared Thermography

2019 ◽  
Vol 9 (24) ◽  
pp. 5464 ◽  
Author(s):  
Marie-Marthe Groz ◽  
Emmanuelle Abisset-Chavanne ◽  
Anissa Meziane ◽  
Alain Sommier ◽  
Christophe Pradère
Keyword(s):  
Temperature Field ◽  
Surface Temperature ◽  
Infrared Thermography ◽  
Three Dimensional ◽  
Ultrasonic Waves ◽  
Temperature Fields ◽  
Heat Sources ◽  
Destructive Testing ◽  
Dimensional Reconstruction ◽  
Energy Conversion Systems

Non-destructive testing (NDT) of materials and structures is a very important industrial issue in the fields of transport, aeronautics and space as well as in the medical domain. Active infrared thermography is an NDT method that consists of providing an external excitation to cause an elevation of the temperature field in the material, consequently allowing evaluation of the resulting temperature field at the surface. However, thermal exciters that are used (flash lamps, halogen, lasers) act only on the surface of the sample. On the other hand, several energy conversion systems can lead to the generation of volumetric sources; the phenomena of thermo-acoustics, thermo-induction, thermomechanics or thermochemistry can be cited. For instance, ultrasonic waves can generate volumetric heat sources if the material is viscoelastic or if there is a defect. The reconstruction of these sources is the initial process for the quantification of parameters responsible for the heating. Characterizing a heat source means reconstructing its geometry and the supplied power. Identification of volumetric heat sources from surface temperature fields is a mathematically ill-posed problem. The main cause of the issue is the diffusive nature of the temperature. In this work, 3D reconstruction of the volumetric heat sources from the resulting surface temperature field, measured by infrared thermography, is studied. An analysis of the physical problem enables specifying the limits of the reconstruction. In particular, a criterion on the achievable spatial resolution is defined, and a reconstruction limitation for in-depth sources is highlighted.

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