Optimization Of A Heat Radiation Intensity And Temperature Field On The Mould Surface

2016 ◽  
Author(s):  
Jaroslav Mlynek ◽  
Roman Knobloch ◽  
Radek Srb
Keyword(s):  
Temperature Field ◽  
Radiation Intensity ◽  
Heat Radiation ◽  
Mould Surface

Measurement of the Temperature Field at the Tool-Chip Interface in Machining

2001 ◽  
Author(s):  
V. Narayanan ◽  
K. Krishnamurthy ◽  
S. Chandrasekar ◽  
T. N. Farris ◽  
V. Madhavan
Keyword(s):  
Temperature Field ◽  
Measurement Technique ◽  
Contact Area ◽  
Radiation Intensity ◽  
Process Models ◽  
Machining Process ◽  
Principal Characteristics ◽  
Intensity Measurements ◽  
Optically Transparent ◽  
Infra Red

Abstract The measurement of the temperature field at the tool-chip interface in machining has been demonstrated. The key elements in the measurement technique are the use of an optically transparent sapphire tool, which has enabled direct images of the tool-chip contact area in the infra-red to be obtained at high spatial and temporal resolution; and radiation intensity measurements in two wavelength windows which have enabled the temperature field to be accurately derived from these intensity values. The principal characteristics of the temperature field such as the variation of temperature with position along the interface and the location of the region of highest temperature are identified. The implications of this measurement to our understanding of the tribology of the tool-chip interface and machining process models are briefly discussed.

Distribution of Temperature Field for Rolling H-Beam

2010 ◽  
Vol 439-440 ◽  
pp. 17-22
Author(s):  
Xian Zhang Feng ◽  
Yan Mei Cui ◽  
Hui Zhao
Keyword(s):  
Thermal Conductivity ◽  
Boundary Condition ◽  
Temperature Field ◽  
Nonlinear Finite Element ◽  
Heat Radiation ◽  
Rolling Stock ◽  
Whole Process ◽  
Simulation Results ◽  
H Beam ◽  
Work Done

A 3D thermal-mechanical coupled was established for simulation model with technique of engineering thermodynamics and theory of nonlinear finite element during H-Beam rolling. The whole process of H-Beam rolling was repeated overall, and base on the known rolling regulations. The rules of temperature distribution were obtained for intersection deformation of web and flange during H-Beam hot rolling, and 45 steel as rolling stock. The studied achievements indicated that temperature of the stock presented tendency fall down, but tendency heighten in some domain, because of the thermal conductivity, heat radiation and convection and heat generation of plastic work done. The simulation results will have guiding meaning for defining rolling regulations and precise boundary condition of temperature for H-Beam.

Numerical Simulation the Temperature Field of the Multi-Coil Batch during Annealing Process in Bell-Type Furnace

2012 ◽  
Vol 538-541 ◽  
pp. 637-641 ◽  
Author(s):  
Chun Li Mo ◽  
Qiang Li ◽  
Xu Ming Guo ◽  
Hao Wang
Keyword(s):  
Temperature Field ◽  
Steel Plate ◽  
Hydrogen Atmosphere ◽  
Annealing Process ◽  
Heat Radiation ◽  
Cooling Process ◽  
Steel Coil ◽  
Coil Temperature ◽  
Batch Annealing ◽  
Steel Coils

In this paper temperature field of multi-coil during batch annealing process in strong forced convective hydrogen atmosphere of Bell-type furnace was simulated, and the influences of heat transferring between steel coil and air flow under a given condition on the temperature field of the steel coil were studied. And then, the temperature field of a single and three coils steel plate were calculated during reheating, holding and cooling process according to the measured annealing curves. The simulated results show that the same trend of temperature in different steel coils. However, considering the heat radiation of steel coil, temperature variation in the topside of coil is higher than that in the bottom of coil.

Analysis of Combustion Characterization of Computer Monitor and Paper in Conic Calorimeter Test

2011 ◽  
Vol 282-283 ◽  
pp. 169-172
Author(s):  
Jia Lei Tan ◽  
Yu Shu Xie ◽  
Xiao Feng Zhang ◽  
Tong Wang
Keyword(s):  
Mass Loss ◽  
Production Rate ◽  
Release Rate ◽  
Radiation Intensity ◽  
Cone Calorimeter ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Growth Index ◽  
Heat Radiation ◽  
Fire Growth

Small-scale burning experimental study of computer monitors and paper was done based on cone calorimeter. The small and middle scale fires were simulated by changing the heat radiation intensity of cone calorimeter. The heat release rate, mass loss rate and production rate of CO was measured in experiment. The data of mass loss rate and CO production rate is fitted, and the formula of its change with time is obtained. The computer monitor has slow pyrolysis speed on the 35 kW/m2, and the carbon layer on surface gradually thickened. So the heat will accumulate, and then the pyrolysis speed increases. The heat release rate reaches to the second peak. The fire growth index of monitor increases as the heat radiation intensity. But the fire growth index of paper has the opposition trend. The CO production rate of computer monitor is larger than paper’s. The experiment results can reflect the combustion characteristics of computer monitor on real fires.

Coupled Simulation on Temperature Field and Microstructure Formation Process of K4169 Superalloy Blade in Investment Casting

2012 ◽  
Vol 217-219 ◽  
pp. 330-333
Author(s):  
Han Wu Liu ◽  
Hong De Ren ◽  
De Chao Dong
Keyword(s):  
Temperature Field ◽  
Phase Change ◽  
Formation Process ◽  
Mechanical Performance ◽  
Grain Structure ◽  
Solute Diffusion ◽  
Heat Radiation ◽  
Transient Temperature ◽  
Time Step ◽  
Temperature State

In order to control the grain structure of K4169 superalloy blade which affects its mechanical performance and ability of resistance to corroding in high temperature state, the transient temperature field distributions were analyzed by using equivalent thermal entropy method with the consideration of the practical boundary conditions, such as, heat exchange and heat radiation in solidification, and the relationships between temperature and time of every point on vertical section and cross section during phase change heat transference process of K4169 superalloy were obtained. The changes of solid phase fraction after every time step were calculated basing on the model of equiaxed dendrite growth solute diffusion put forward by Rappaz and other persons. we used the data to modify the temperature in the same step when phase change latent heat was released. The Cell Automaton technology was adopted to coupled simulate the grain structure formation process of K4169 superalloy blade with its temperature fields using continuous nucleation model and kinetic model of dendrite tip growth. These simulation results which coincided much well with the ones of experiment test have played a very important role in studying superalloy mechanical performance and ability of resistance to corroding of K4169 alloy blades.

Research on Temperature Field and Heat Transfer inside Catalytic Combustion Furnace of Natural Gas

2012 ◽  
Vol 516-517 ◽  
pp. 66-69
Author(s):  
Shi Hong Zhang ◽  
Juan Li ◽  
Xing Xing Shi
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Natural Gas ◽  
Catalytic Combustion ◽  
Decisive Role ◽  
Heat Radiation ◽  
High Radiation ◽  
Catalytic Ignition ◽  
Start Up ◽  
Local Surface Temperature

This article discussed the temperature field and heat transfer inside catalytic combustion furnace with Pd-based honeycomb monoliths of lean natural gas-air mixtures. The monoliths need to be ignited by gas phase combustion with the excessive air coefficient at 1.63 during the period of start-up process. After local catalytic ignition, a steady state has reached. The temperature field was measured by thermocouple K of diameter 1.0. It was shown that the temperature gradient changed according to the different position inside catalytic combustion furnace. When the furnace was used for heating equipment, heat transfer included mainly heat radiation and convection. For high radiation heat, local surface temperature of monoliths plays a decisive role.

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