Electro-thermal coupling behavior and temperature distribution of 3-D braided composite under direct current

2021 ◽  
pp. 109043
Author(s):  
Yousong Xue ◽  
Shuwei Huang ◽  
Baozhong Sun ◽  
Bohong Gu
Keyword(s):  
Temperature Distribution ◽  
Direct Current ◽  
Thermal Coupling ◽  
Braided Composite ◽  
Coupling Behavior

scholarly journals Thermomechanical coupling of ice flow with the bedrock

2003 ◽  
Vol 37 ◽  
pp. 390-396 ◽  
Author(s):  
Richard C.A. Hindmarsh
Keyword(s):  
Temperature Distribution ◽  
Horizontal Velocity ◽  
Time Dependent ◽  
Thermomechanical Coupling ◽  
Positive Anomaly ◽  
Thermal Coupling ◽  
Steady Temperature ◽  
Ice Flow ◽  
Time Dependent Problem ◽  
Geomorphological Processes

AbstractTwo aspects of thermal coupling with bedrock are considered: the coupled time-dependent problem of co-evolving temperatures in lithosphere and ice; and the influence of basal topography on steady temperature distribution within the ice. The nature of the time-dependent coupling is found to depend on the horizontal velocity. As has been suggested, there is a cooling of steady temperatures on bedrock highs, but this is phase-shifted downstream when horizontal velocities increase. This observation may have consequences for geomorphological processes such as plucking and protection. The effect of bedrock channelling on steady temperature is considered. The positive anomaly of basal temperature due to channelling increases as the transverse wavelength decreases, but not monotonically, reaching a plateau when both the wavelengths of the basal topography are around 100 km.

scholarly journals Electric Field and Temperature Simulations of High-Voltage Direct Current Cables Considering the Soil Environment

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4910
Author(s):  
Christoph Jörgens ◽  
Markus Clemens
Keyword(s):  
Temperature Distribution ◽  
Electric Field ◽  
High Voltage ◽  
Direct Current ◽  
Insulation Material ◽  
Soil Environment ◽  
High Voltage Direct Current ◽  
Weakly Coupled ◽  
Surrounding Soil ◽  
Symmetric Temperature

For long distance electric power transport, high-voltage direct current (HVDC) cable systems are a commonly used solution. Space charges accumulate in the HVDC cable insulations due to the applied voltage and the nonlinear electric conductivity of the insulation material. The resulting electric field depends on the material parameters of the surrounding soil environment that may differ locally and have an influence on the temperature distribution in the cable and the environment. To use the radial symmetry of the cable geometry, typical electric field simulations neglect the influence of the surrounding soil, due to different dimensions of the cable and the environment and the resulting high computational effort. Here, the environment and its effect on the resulting electric field is considered and the assumption of a possible radial symmetric temperature within the insulation is analyzed. To reduce the computation time, weakly coupled simulations are performed to compute the temperature and the electric field inside the cable insulation, neglecting insulation losses. The results of a weakly coupled simulation are compared against those of a full transient simulation, considering the insulation losses for two common cable insulations with different maximum operation temperatures. Due to the buried depth of HV cables, an approximately radial symmetric temperature distribution within the insulation is obtained for a single cable and cable pairs when, considering a metallic sheath. Furthermore, the simulations show a temperature increase of the earth–air interface above the buried cable that needs to be considered when computing the cable conductor temperature, using the IEC standards.

Temperature distribution in a gas conductor heated by direct current

1969 ◽  
Vol 16 (1) ◽  
pp. 27-30
Author(s):  
D. F. Bozhko ◽  
�. I. Molodykh ◽  
A. V. Pustogarov
Keyword(s):  
Temperature Distribution ◽  
Direct Current

Characteristics of an underwater direct current discharge in bubbles and the temperature distribution in the bubbles

2012 ◽  
Vol 19 (2) ◽  
pp. 023501 ◽  
Author(s):  
Ranhua Xiong ◽  
Anton Yu. Nikiforov ◽  
Patrick Vanraes ◽  
Christophe Leys
Keyword(s):  
Temperature Distribution ◽  
Direct Current ◽  
Current Discharge ◽  
Direct Current Discharge

Thermomechanical Coupling Behavior of Viscoelastic Rods Subjected to Cyclic Loading

1967 ◽  
Vol 34 (1) ◽  
pp. 127-132 ◽  
Author(s):  
N. C. Huang ◽  
E. H. Lee
Keyword(s):  
Boundary Condition ◽  
Steady State ◽  
Temperature Distribution ◽  
The Other ◽  
Thermomechanical Coupling ◽  
Radiation Boundary Condition ◽  
Coupling Behavior ◽  
Radiation Boundary ◽  
Iterative Procedures ◽  
Rod Of Finite Length

The problem of longitudinal oscillation of a viscoelastic rod of finite length including the effect of thermomechanical coupling has been studied. The material is assumed to be thermorheologically simple. The almost steady oscillation superposed on a slowly varying temperature distribution permits representation as a boundary-value problem which is solved numerically by iterative procedures. Calculations are made for different stress levels and frequencies. It is found that the temperature increases considerably after a length of time of vibration although the stress level is low. A steady state of temperature can be reached if the temperature at one end of the rod is fixed and a radiation boundary condition is prescribed at the other end.

Simultaneous Optimization of Ge Doping Profile and Layout in Multi-Finger Power SiGe HBTs for High Thermal Stability

2013 ◽  
Vol 816-817 ◽  
pp. 80-83
Author(s):  
R.X. Hua ◽  
D.Y. Jin ◽  
W.R. Zhang ◽  
D. Lu ◽  
Q. Fu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Temperature Distribution ◽  
Simultaneous Optimization ◽  
Doping Profile ◽  
Current Gain ◽  
Thermal Coupling ◽  
Base Region ◽  
Sige Hbt ◽  
Ge Doping ◽  
Thermal Stability Of

Considering the effect of electro-thermal feedback on the thermal stability of multi-finger power SiGe HBT, optimization of SiGe HBT on both Ge doping profile (electrical aspect) and layout (thermal aspect) is demonstrated in this paper. A novel stepped Ge doping profile of SiGe HBT with a grading Ge concentration in base region is proposed to improve the temperature coefficient of current gain, meanwhile, the cut-off frequency of HBT is also increased considerably due to the accelerated electric field caused by the Ge concentration grading. However, there is still an uneven temperature distribution. Therefore, the layout of multi-finger HBT with nun-uniform emitter finger length is optimized to compensate the thermal coupling effects and hence the uneven temperature distribution is improved obviously. It is shown that the device with simultaneous optimization of Ge doping profile and layout could be in thermal stability over a wide temperature range, which presents useful guideline to design microwave power HBTs.

Numerical Modeling of Chemical and Thermal Coupling in a Silicon Carbide Based Heat Exchanger Reactor

2010 ◽  
Vol 112 ◽  
pp. 93-101
Author(s):  
Benjamin Boniface ◽  
Serge Caperaa ◽  
Olivier Dalverny
Keyword(s):  
Silicon Carbide ◽  
Numerical Modeling ◽  
Heat Exchanger ◽  
Temperature Distribution ◽  
Thermal Coupling ◽  
Mechanical Reliability ◽  
Reliability Study

The objective of this paper is to present the solution developed to model the chem- ical and thermal coupling occurring in an intensied heat exchanger reactor. The results of this modeling are all the properties of the chemical uid along the conduit, and the temperature distribution in the structure. This will be used to manage a thermal and mechanical reliability study of the heat exchanger reactor.

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