Numerical calculation of temperature field for the case of simple convection model in autoclave

2003 ◽  
Author(s):  
W. Hofman
Keyword(s):  
Temperature Field ◽  
Numerical Calculation ◽  
Convection Model

Research on Temperature Rise of Wet Clutch Based on Multi-Field Coupling

2019 ◽  
Author(s):  
Bangzhi Wu ◽  
Datong Qin ◽  
Jianjun Hu ◽  
Qing Zhang
Keyword(s):  
Temperature Field ◽  
Numerical Calculation ◽  
Flow Field ◽  
Field Distribution ◽  
Working Conditions ◽  
Temperature Rise ◽  
Automatic Transmission ◽  
Calculation Model ◽  
Field Coupling ◽  
Wet Clutch

Abstract Wet clutch is widely used in vehicle power transmission, especially in dual clutch automatic transmission. However, due to the unclear understanding of clutch temperature distribution and its influencing factors, the clutch is prone to excessive temperature rise or even wear under severe working conditions or continuous starting conditions. In this paper, the finite element model of stress field distribution of friction pair is established by considering the non-uniform fixed constraint of clamping spring and the non-uniform contact of hydraulic cylinder. Based on the inclined groove structure of the friction plate, the numerical calculation model of the flow field in the groove is established by the finite volume method. On this basis, considering the time-varying characteristics of stress distribution and cooling flow field distribution of clutch friction pairs, a numerical calculation model of clutch temperature field is established, and a multi-field coupling calculation method of clutch is proposed. The distribution of temperature field under different working conditions during clutch engagement is obtained by numerical calculation. The results show that the temperature rise of clutch depends on the target speed of the clutch driving end and the load on the driven end. The research results can provide guidance for the design and control of the clutch.

scholarly journals Numerical simulation and analysis of the temperature effect on the fission of concrete

2019 ◽  
Vol 23 (5 Part A) ◽  
pp. 2713-2720 ◽  
Author(s):  
Guangcheng Liu
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Numerical Calculation ◽  
Temperature Control ◽  
Surface Stress ◽  
Simulation Method ◽  
Concrete Surface ◽  
Effect Of Temperature ◽  
Insulation Material ◽  
Maximum Surface

In order to further improve the crack resistance of concrete engineering, a numerical simulation method is constructed to study the effect of temperature on the fission of concrete. Based on the finite element method, the mathematical model is constructed, and the numerical calculation and image display are used to simulate and analyze the engineering problems. The temperature sensor is used to observe the whole variation law of typical temperature field, and the temperature of concrete entering and pouring is obtained. Thus, the temperature control real-time automatic acquisition system is set up. According to the temperature field and temperature stress distribution rules, the ideal temperature control curve model of concrete is proposed. Finally, the numerical calculation and experiment of the model are carried out. The results show that the maximum surface stress level decreases in varying degrees after different surface insulation measures are taken, and if the thermal insulation material?s ? ? 10 kJ/m2h?, the maximum surface stress of concrete can be reduced to 0.06~0.14 MPa. In this paper, it is shown that the negative effect of the large diurnal temperature difference on concrete surface insulation can be controlled.

Study on the Thermal Contact Zone in the Surface Grinding

2011 ◽  
Vol 188 ◽  
pp. 523-528
Author(s):  
Chong Lue Hua ◽  
Gui Cheng Wang ◽  
Hong Jie Pei ◽  
Gang Liu
Keyword(s):  
Heat Flux ◽  
Temperature Field ◽  
Thermal Contact ◽  
Heat Fluxes ◽  
Grinding Temperature ◽  
The Finite Element Method ◽  
Temperature Dependent ◽  
Convection Model ◽  
Temperature Dependent Properties ◽  
Circular Heat

The present study aims to investigate the temperature field by using the different heat fluxes, such as rectangle heat flux, triangular heat flux, inclined triangular heat flux, circular heat flux. To obtain a reliable figure of temperature field induced by grinding, temperature-dependent properties of work materials were taken into account and a convection model with an effective cooling factor was introduced. A thorough analysis using the finite element method showed that predictions were very agreed with the results of the experiment. Finally, the present paper showed that the contact angle must be taken into account in future models.

The vertical circulation at meteorological fronts and its relation to frontogenesis

1956 ◽  
Vol 234 (1198) ◽  
pp. 346-362 ◽  
Keyword(s):  
Temperature Field ◽  
Numerical Calculation ◽  
Temperature Gradient ◽  
Thermal Gradient ◽  
Vertical Circulation ◽  
Upward Motion ◽  
Horizontal Temperature Gradient ◽  
Air Masses ◽  
Upper Troposphere ◽  
Air Movement

Evidence is obtained from the examination of synoptic charts to show that the horizontal components of the air movement in the vicinity of active fronts are such as to tend to increase the thermal gradient between the two air masses. The dynamical consequences of this type of frontogenetic flow are examined by numerical calculation in respect of a very simple atmosphere structure. It is shown that the characteristic upward motion of the warm air and sinking of the cold air must take place, but the calculated upward motion of the warm air is insufficient to account for the observed rainfall unless the effect on the temperature field of the release of latent heat in the cloudy air is taken into account. The characteristic slope of frontal surfaces also appears to arise from the vertical circulation which also tends to give the strongest horizontal temperature gradient near the ground and in the upper troposphere.

Modeling and Numerical Calculation of Heat Transfer during Magnetic Field Quenching

2005 ◽  
Vol 475-479 ◽  
pp. 285-288
Author(s):  
Zhen Hua Li ◽  
Mei Hong Liu ◽  
Jun Ruo Chen ◽  
Rong Feng Zhou
Keyword(s):  
Magnetic Field ◽  
Temperature Field ◽  
Numerical Calculation ◽  
Carbon Steel ◽  
Magnetic Coupling ◽  
Steel Sample ◽  
Axisymmetric Body ◽  
Constructive Model ◽  
Cooling Curves ◽  
The Magnetic Field

A new nonlinear constructive model for description of temperature field of carbon steel axisymmetric body during the magnetic field quenching has been established based on thermo-magnetic coupling analysis. Using the model and finite element method, a numerical calculation program is developed with Microsoft FORTRAN 5.0, and cooling curves of center in a carbon steel sample of 30mm in diameter and 60mm in length during magnetic field quenching and common quenching are calculated and tested. Results showed that calculated cooling curves is accordant with corresponded tested cooling curves very well, and the calculated accuracy of temperature field during magnetic field quenching based on the new model is satisfactory.

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