Parameter estimation and optimal design of thermal radiation detectors using engineering prototypes and numerical models

1999 ◽  
Author(s):  
Ira J. Sorensen ◽  
J. Robert Mahan ◽  
Mamadou Y. Barry ◽  
Edward H. Kist, Jr.
Keyword(s):  
Parameter Estimation ◽  
Optimal Design ◽  
Thermal Radiation ◽  
Numerical Models ◽  
Radiation Detectors

Parametric height influence analysis on thermal radiation and convection applied to real ovens

2021 ◽  
pp. 095440892110375
Author(s):  
Sílvio Aparecido Verdério Júnior ◽  
Vicente Luiz Scalon ◽  
Santiago del Rio Oliveira ◽  
Elson Avallone ◽  
Paulo César Mioralli ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Radiation ◽  
Numerical Models ◽  
Radiation Heat Transfer ◽  
Geometric Optimization ◽  
Operating Conditions ◽  
High Productivity ◽  
Order Of Magnitude ◽  
Lower Height ◽  
Heat Exchanges

Due to their greater flexibility in heating and high productivity, continuous tunnel-type ovens have become the best option for industrial processes. The geometric optimization of ovens to better take advantage of the heat transfer mechanisms by convection and thermal radiation is increasingly researched; with the search for designs that combine lower fuel consumption, greater efficiency and competitiveness, and lower costs. In this sense, this work studied the influence of height on heat exchanges by radiation and convection and other flow parameters to define the best geometric height for the real oven under study. From the dimensions and real operating conditions of continuous tunnel-type ovens were built five numerical models of parametric variation, which were simulated with the free and open-source software OpenFOAM®. The turbulent forced convection regime was characterized in all models. The use of greater heights in the ovens increased and intensified the recirculation regions, reduced the rates of heat transfer by thermal radiation, and reduced the losses of heat by convection. The order of magnitude of heat exchanges by radiation proved to be much higher than heat exchanges by convection, confirming the results of the main references in the technical-scientific literature. It was concluded that the use of ovens with a lower height provides significant increases in the thermal radiation heat transfer rates.

scholarly journals Multiobjective optimal design of reinforced concrete frames using two metaheuristic algorithms

2021 ◽  
Vol 9 (4B) ◽  
Author(s):  
Mehdi Babaei ◽  
◽  
Masoud Mollayi ◽  
Keyword(s):  
Reinforced Concrete ◽  
Optimal Design ◽  
Optimization Problem ◽  
Numerical Models ◽  
Steel Structures ◽  
Metaheuristic Algorithms ◽  
Rc Structures ◽  
Weighted Sum Method ◽  
Rc Frames ◽  
Single Objective

Genetic algorithm (GA) and differential evolution (DE) are metaheuristic algorithms that have shown a favorable performance in the optimization of complex problems. In recent years, only GA has been widely used for single-objective optimal design of reinforced concrete (RC) structures; however, it has been applied for multiobjective optimization of steel structures. In this article, the total structural cost and the roof displacement are considered as objective functions for the optimal design of the RC frames. Using the weighted sum method (WSM) approach, the two-objective optimization problem is converted to a single-objective optimization problem. The size of the beams and columns are considered as design variables, and the design requirements of the ACI-318 are employed as constraints. Five numerical models are studied to test the efficiency of the GA and DE algorithms. Pareto front curves are obtained for the building models using both algorithms. The detailed results show the accuracy and convergence speed of the algorithms.

Thermal Radiation Detectors

1959 ◽  
Vol 47 (9) ◽  
pp. 1470-1470
Author(s):  
R. Waard ◽  
E. Wormser
Keyword(s):  
Thermal Radiation ◽  
Radiation Detectors

Inhomogeneous SiOx〈Fe〉 metal-dielectric films as a material for infrared thermal radiation detectors

2003 ◽  
Vol 48 (2) ◽  
pp. 261-264 ◽  
Author(s):  
E. V. Michailovskaya ◽  
I. Z. Indutnyy ◽  
P. E. Shepeliavyi
Keyword(s):  
Thermal Radiation ◽  
Radiation Detectors ◽  
Dielectric Films

Parameter estimation in six numerical models of transperitoneal transport of potassium in patients undergoing peritoneal dialysis

1995 ◽  
Vol 15 (3) ◽  
pp. 185-197 ◽  
Author(s):  
J. Graff ◽  
S. Fugleberg ◽  
P. Joffe ◽  
J. Brahm ◽  
N. Fogh-Andersen
Keyword(s):  
Parameter Estimation ◽  
Peritoneal Dialysis ◽  
Numerical Models

scholarly journals Optics-less smart sensors and a possible mechanism of cutaneous vision in nature

Open Physics ◽  
2010 ◽  
Vol 8 (3) ◽  
Author(s):  
Leonid Yaroslavsky ◽  
Chad Goerzen ◽  
Stanislav Umansky ◽  
H. Caulfield
Keyword(s):  
Parameter Estimation ◽  
Numerical Simulations ◽  
Statistical Parameter ◽  
Radiation Detectors ◽  
Estimation Theory ◽  
Curved Surface ◽  
Smart Sensors ◽  
Working Principle ◽  
Living Organisms ◽  
Shed Light

AbstractAlthough optics-less cutaneous (“skin”) vision is not uncommon among living organisms, its mechanisms and capabilities have not been thoroughly investigated. This paper demonstrates, using methods from statistical parameter estimation theory and numerical simulations, that arrays of bare radiation detectors arranged on a planar or curved surface have the ability to perform imaging tasks without any optics at all. The working principle of this type of optics-less sensors and the model developed here for determining their performance may be used to shed light on possible mechanisms, capabilities and evolution of cutaneous vision in nature.

scholarly journals Axisymmetric modelling of transient thermal response in solids for application to infrared photothermal radiometry technique

2018 ◽  
Vol 65 (1) ◽  
pp. 54
Author(s):  
Jose Antonio Calderon Arenas
Keyword(s):  
Thermal Radiation ◽  
Linear Approximation ◽  
Numerical Models ◽  
Thermal Response ◽  
Heat Losses ◽  
Photothermal Radiometry ◽  
Heat Diffusion ◽  
Radiation Emission ◽  
Heat Diffusion Equation ◽  
Boltzmann Law

To induce temperature changes on the sample surface by the incidence of a monochromatic modulated light beam and detect the changes produced in the thermal radiation emission is the basic principle of the infrared photothermal radiometry technique. Until now, in order to analyze the thermal response mathematical models based in an one-dimensional model were used considering a sample with a finite thickness and an infinite incidence surface, as well as, the linear approximation of the Stefan-Boltzmann Law in the calculus of the heat losses due to thermal radiation. In this work, analytical and numerical models for the 2D heat diffusion in homogenous finite solid samples, are presented. These models were obtained by solving the heat diffusion equation, under cylindrical symmetry, considering mixed boundary conditions to include radiation and convection heat losses through the surfaces of the sample, and a monochromatic Gaussian excitation beam impinging on the front of the sample. The analytical models were obtained by solving the governing equations, considering the well-known linear approximation of the Stefan-Boltzmann law in the calculus of the heat losses due to thermal radiation. To analyse the effects of the non-linearity of the heat losses by thermal radiation on the thermal transient response, in the numerical model it was taken into account the full expression of the Stefan-Boltzmann law, and the transport equation was solved numerically by means of the Finite Element Method (FEM). The analytical solution for the oscillatory thermal response reveals the close dependence of the thermal response on the ratio of thickness to the radius of the sample, represented by the form factor sf. Both, the analytical and the numerical solutions were employed to simulate the thermal response of homogenous materials, and compared with experimental results reported elsewhere by part of our same research group. Finally, the difference between the thermal response predictions, from the analytical and numerical models, were analyzed.

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