scholarly journals PREDICTION OF TEMPERATURE RISE OF CONCRETE MEMBER USING MATHEMATICAL MODEL FOR CEMENT HYDRATION AND MICROSTRUCTURE FORMATION

2008 ◽  
Vol 73 (623) ◽  
pp. 9-17 ◽  
Author(s):  
Hisashi SUGIYAMA ◽  
Yoshihiro MASUDA
Keyword(s):  
Mathematical Model ◽  
Temperature Rise ◽  
Cement Hydration ◽  
Microstructure Formation ◽  
Concrete Member

Effect of a liquid-type temperature rise inhibitor on cement hydration

2021 ◽  
Vol 140 ◽  
pp. 106286
Author(s):  
Yu Yan ◽  
Rui Wang ◽  
Jiaping Liu ◽  
Jinhui Tang ◽  
Karen L. Scrivener
Keyword(s):  
Temperature Rise ◽  
Cement Hydration ◽  
Liquid Type

Research on Identification Model of Stator Core Temperature Rise of a Generator

2014 ◽  
Vol 1070-1072 ◽  
pp. 1216-1221
Author(s):  
Dong Xiang ◽  
Hao Xiong ◽  
Ning Bo Liu ◽  
Qiang Wu ◽  
Guang Wei Meng
Keyword(s):  
Mathematical Model ◽  
Temperature Rise ◽  
Reactive Power ◽  
Ventilation System ◽  
Stator Winding ◽  
Phase Voltage ◽  
Stator Core ◽  
Voltage Phase ◽  
The Mathematical Model ◽  
Generator Stator

This paper takes the ship air-cooled AC generator with the radial ventilation system for example, establishes the mathematical model of a generator core and winding temperature by using an equivalent thermal circuit method and the temperature calculation method based on the operating parameters, analyzes the transfer function between the generator stator winding temperature rise and the phase voltage, phase current and reactive power, and finally verifies validity of the mathematical model by the experiment.

Dispersion and Absorption of SBR Latex in the System of Mono-Dispersed Cement Particles in Water

2013 ◽  
Vol 687 ◽  
pp. 347-353 ◽  
Author(s):  
Xiao Xin Shi ◽  
Ru Wang ◽  
Pei Ming Wang
Keyword(s):  
Cement Hydration ◽  
Single Layer ◽  
Optical Microscope ◽  
Solution Phase ◽  
Environmental Scanning ◽  
Cement Particle ◽  
Microstructure Formation ◽  
Cement Ratio ◽  
Water To Cement Ratio ◽  
Cement Based Materials

This paper investigates the dispersion of cement particles in water at different mix proportions using optical microscope, and the dispersion and absorption of SBR latex in the system of mono-dispersed cement particles in water using environmental scanning electron microscope (ESEM). The results show that the mono-dispersed cement can be well obtained at the water to cement ratio (mw/mc) of 10:1. The ESEM images present that SBR latex is dispersed on the surface of the cement particles as well as the solution phase. SBR latex does not prefer to be absorbed on the cement particles in spite of their opposite electric charge but chooses to be dispersed in the system proportionally. In addition, SBR particles are single-layer absorbed on the surface of cement particles in all the SBR latex to cement ratios (mp/mc). Several SBR particles absorbed on the surface of cement particle get close enough to form groups at the mp/mc of 15% and 20%. The results of this paper provide some bases for analyzing the influence of polymer on cement hydration and the microstructure formation of polymer-modified cement-based materials in a new view.

Thermal Model of Disk Coil With Directed Oil Flow

2008 ◽  
Author(s):  
Shahram Khalil Aria ◽  
Sahar Samsami
Keyword(s):  
Mathematical Model ◽  
Optimal Design ◽  
Temperature Rise ◽  
Thermal Model ◽  
Hot Spot ◽  
Exact Location ◽  
Oil Flow ◽  
Transformer Winding ◽  
Spot Temperature

In this paper, a developed mathematical model for temperature rise calculation is briefly described. In this model, at first, load loss of a transformer winding with forced directed oil is calculated and the winding temperature rise along the horizontal ducts and vertical ducts is computed. Then hot spot temperature and its exact location is determined. The model can also be used for optimal design of winding in size and cooling. Finally the results are given and compared with experiment values.

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.

Comprehensive Calculation of Winding Loss, Fluid and Temperature Field in Large Power Transformer

2014 ◽  
Vol 513-517 ◽  
pp. 3381-3384
Author(s):  
Yong Teng Jing ◽  
Yan Li ◽  
Longnv Li ◽  
Man Hua Jiang ◽  
Ning Wang
Keyword(s):  
Mathematical Model ◽  
Temperature Rise ◽  
Working Condition ◽  
Cooling System ◽  
Power Transformer ◽  
Hydraulic Loss ◽  
Operating Characteristics ◽  
Large Power ◽  
Oil Flow ◽  
Transformer Winding

This paper has make a deep theoretical analysis and experimental research according to the load loss of large capacity transformer which included the loss component decomposition, the analysis of the oil flow cooling system performance and working condition, the stray loss and temperature rise of the winding area. We have done the following work on the background of the 1000kV power transformer: The winding area loss was calculated based on the weight coefficient method and field circuit coupling method; considering that the hydraulic loss of the transformer cooling system is nonlinear and the nonlinear operating characteristics of the oil flow pump, establishing the cooling oil-way mathematical model of the transformers non winding area, and analysis the working condition of the transformer cooling system. Establishing the transformer winding multi-physics coupling mathematical model and researching the transformer winding heat problem based on the nonlinear influence of the material. The error between the windings numerical calculation results and the loss, winding temperature rise meet requirements of the engineering analysis according to this method. The calculation in this paper has high precision, and it can be used in the structure optimization of the large transformer winding.

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