A mathematical model describing the ARI “autocirculation reactor” for low temperature conversion of H2S into sulphur

1994 ◽  
Vol 17 (2) ◽  
pp. 141-143 ◽  
Author(s):  
M. Abedinzadegan ◽  
M. R. Jaffari Nasr
Keyword(s):  
Mathematical Model ◽  
Low Temperature

Prevention of Corrosion in Austenitic Stainless Steel through a Predictive Numerical Model Simulating Grain Boundary Chromium Depletion

2017 ◽  
pp. 374-389
Author(s):  
M.K. Samal
Keyword(s):  
Mathematical Model ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Numerical Model ◽  
Low Temperature ◽  
Grain Boundary ◽  
Stainless Steels ◽  
Predictive Models ◽  
Chromium Depletion ◽  
Sensitization Behavior

In this chapter, a mathematical model for rate of formation of chromium carbides near the grain boundary, which is a pre-cursor to chromium depletion and corresponding sensitization behavior in stainless steels, is presented. This model along with the diffusion equation for chromium in the grain has been used to obtain chromium depletion profiles at various time and temperature conditions. Finite difference method has been used to solve the above equations in the spherical co-ordinate system and the results of time-temperature-sensitization diagrams of four different types of alloys have been compared with those of experiment from literature. For the problem of low temperature sensitization and corresponding inter-granular corrosion in austenitic stainless steel, it is very difficult to carry out experiment at higher temperatures and justify its validity at lower operating temperatures by extrapolation. The development of predictive models is highly useful in order to design the structures for prevention of corrosion of the material in aggressive environments.

scholarly journals A mathematical model to predict early quality attributes in hake during storage at low temperature

2018 ◽  
Vol 222 ◽  
pp. 11-19 ◽  
Author(s):  
C. Vilas ◽  
A.A. Alonso ◽  
J.R. Herrera ◽  
M. Bernárdez ◽  
M.R. García
Keyword(s):  
Mathematical Model ◽  
Low Temperature ◽  
Quality Attributes

scholarly journals Mathematical processing of results experimental studies of low-temperature modes of drying of capillary-porous materials of spherical shape

2019 ◽  
pp. 20-25
Author(s):  
Yu.F. Snezhkin ◽  
V.М. Paziuk ◽  
Zh.O. Petrova
Keyword(s):  
Mathematical Model ◽  
Low Temperature ◽  
Porous Materials ◽  
Experimental Studies ◽  
Spherical Shape ◽  
Response Surfaces ◽  
Convective Drying ◽  
Regression Equations ◽  
Drying Time ◽  
Mathematical Processing

The mathematical processing of experimental data obtained during the drying of spherical form of capillary-porous materials on a convective drying bench allows us to determine the influence of various factors on the process. The main factors influencing the kinetics of drying of capillary-porous materials of spherical shape are the temperature and velocity of the heat carrier, as well as the initial moisture content of the material. For each factor, the variation levels corresponding to the optimal conditions for conducting experimental studies with low-temperature drying conditions are recommended. For a mathematical description of the duration of drying of capillary-porous materials, we use an orthogonal composite plan of the second order. As a result, the proposed mathematical model of the process obtained regression equations and the response surface of the duration of drying of capillary-porous materials of spherical shape. The obtained regression equations of the drying time give a detailed description of the influence of both individual and joint actions of factors, the significance of these parameters is determined by the corresponding coefficients according to Student's criterion. Also, the adequacy of the mathematical model according to Fisher's criterion, which corresponds to the real object, is checked. The construction of the response surfaces of the drying time of capillary-porous materials indicates the nature of the effect of these factors in the given range of variation.

The Research on the Heat Transfer Process of Low Temperature Hot Water Radiant Heating Phase Change Wallboard

2013 ◽  
Vol 800 ◽  
pp. 18-21
Author(s):  
Quan Ying Yan ◽  
Li Hang Yue ◽  
Ran Huo
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Low Temperature ◽  
Phase Change ◽  
Physical Model ◽  
Transfer Process ◽  
Heat Transfer Process ◽  
Hot Water ◽  
Radiant Heating ◽  
Heating Phase

In this paper, physical model and mathematical model of the hot water radiant heating phase change wallboard were built. The heat transfer process of wallboard was simulated to analyze different influencing factors and optimize the design of the hot water heating phase change wallboard. The research results can provide reference and basis to the optimization of low temperature hot water radiant heating phase change wallboard.

Study of the Mathematical Model for Online Predicting Mix Mooney Viscosity on the Rubber Open Mill

2013 ◽  
Vol 561 ◽  
pp. 54-58
Author(s):  
Xian Kui Zeng ◽  
Chang He Yang ◽  
Ze Shuai Song ◽  
Shu Hong Zhao
Keyword(s):  
Mathematical Model ◽  
Low Temperature ◽  
The Self ◽  
Experimental Results ◽  
Mooney Viscosity ◽  
The Mathematical Model ◽  
Predictive Effect

According to studying the mechanism of open mill mixing in low temperature and its intelligent mixing theory, based on the analysis of the experimental results getting from the self-developed XK-160E type open mill, we established a mathematical model for predicting the mix Mooney viscosity. The inspection and verification of mathematical model results showed that the predicted Mooney viscosity was very close to the practical value indicating a good predictive effect．

Thermodynamic Modelling of an Adsorption Chiller Based on a Zeolite

2015 ◽  
Author(s):  
Marco Badami ◽  
Armando Portoraro ◽  
Marco Simonetti ◽  
Paolo Tebaldi
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Numerical Model ◽  
Low Temperature ◽  
Low Power ◽  
Thermal System ◽  
Adsorption Chiller ◽  
Solar Cooling ◽  
Simulation Results ◽  
Solar Thermal System

Low power adsorption chillers with low desorption temperatures deserve particular attention, because of the possibility of driving them with a solar thermal system integrated with buildings. The monitoring of a recent solar cooling installation in Turin, Italy, has pointed out the opportunity of developing a dynamic mathematical model, in order to simulate the transient performances of this plant. Focusing on the aforementioned low power-low temperature adsorption chiller category, this work proposes a numerical model of the systems, that include a novel zeolite as the adsorbent and water as the refrigerant fluid. The simulation results have been verified by means of the nominal values of one of the very few commercial chillers of this typology available on the market, and have compared with experimental data found in the literature for similar plants.

scholarly journals Mathematical model of low-temperature wafer bonding under medium vacuum and its application

2005 ◽  
Vol 28 (4) ◽  
pp. 650-658 ◽  
Author(s):  
Wei Bo Yu ◽  
Jun Wei ◽  
Cher Ming Tan ◽  
Guang Yu Huang
Keyword(s):  
Mathematical Model ◽  
Low Temperature ◽  
Wafer Bonding ◽  
Medium Vacuum

Study on the Electrolysis Expansion of Carbon Cathode in [K3AlF6/Na3AlF6]-AlF3-Al2O3 Low Temperature Melts

2013 ◽  
Vol 749 ◽  
pp. 633-642
Author(s):  
Zhao Fang ◽  
Peng Fei Xu ◽  
Jian Xu ◽  
Lin Bo Li ◽  
Jun Zhu
Keyword(s):  
Mathematical Model ◽  
Low Temperature ◽  
Alkali Metal ◽  
Test Results ◽  
Carbon Cathode ◽  
The Mathematical Model ◽  
Good Agreement

Electrolysis expansion of carbon cathodes due to alkali metal penetration in [K3AlF6/Na3AlF6]-AlF3-Al2O3 melts was tested. Effect of ampere density and superheating temperature on the electrolysis expansion was studied. A mathematical model was got to numerically describe electrolysis expansion performance of carbon cathode. The results indicated that K and Na penetrate into carbon cathode from outside to inside. Ampere density and superheating temperature had a great effect on the electrolysis expansion of carbon cathode. With the superheating temperature increasing from 10 to 50, electrolysis expansion increased from 1.41% to 2.10% gradually. With the ampere density increasing, the increase trend of electrolysis expansion was not linear. When ampere density was lower than 0.4A / cm2 and greater than 0.7A / cm2, cathode electrolysis expansion obviously increased with the increase of ampere density. Meanwhile, cathode electrolysis expansion tended to be constant as the ampere density changed at the range of 0.4A / cm2 to 0.7A / cm2.The results of the mathematical model in this study had a good agreement with the test results. This model would be helpful to accurately describe the anti-penetration performance of K and Na on the carbon cathode.

A Model for Predicting the Temperature Distribution Around Radioactive Waste Containers in Very Deep Geological Boreholes

2008 ◽  
Vol 1107 ◽  
Author(s):  
Karl P. Travis ◽  
Neil A. McTaggart ◽  
Fergus G. F. Gibb ◽  
David Burley
Keyword(s):  
Mathematical Model ◽  
Temperature Field ◽  
High Temperature ◽  
Temperature Distribution ◽  
Low Temperature ◽  
Radioactive Waste ◽  
Temperature Rise ◽  
Deep Borehole ◽  
Numerical Work

AbstractWe present a mathematical model for determining the temperature field around radioactive waste containers in very deep geological boreholes. The model is first used to predict the temperature rise for some simple, but well-established cases with known solutions in order to verify the numerical work. The temperature distribution is then determined for two variants of the deep bore hole concept; a low temperature variant and a high temperature variant. The results from these studies are discussed in terms of their utility in establishing deep borehole disposal as a workable concept.

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