OS1703 Transient Heat Conduction and Thermal Stress Problems of a Compound Plate Subjected to Concentrated Solar Radiation

2012 ◽  
Vol 2012 (0) ◽  
pp. _OS1703-1_-_OS1703-3_
Author(s):  
Fumiya TOKUMARU ◽  
Ryuusuke KAWAMURA ◽  
Yoshinori NAGASE ◽  
Shigeki TOMOMATSU
Keyword(s):  
Heat Conduction ◽  
Thermal Stress ◽  
Solar Radiation ◽  
Transient Heat Conduction ◽  
Concentrated Solar Radiation ◽  
Compound Plate

Transient Thermal Stress Analysis of the Typical Structures in Turbine Rotor Based on Thermomechanical Analysis

2014 ◽  
Author(s):  
Ning Xu ◽  
Zhansheng Liu ◽  
He Peng
Keyword(s):  
Finite Element ◽  
Heat Conduction ◽  
Thermal Stress ◽  
Thermal Stresses ◽  
Transition Process ◽  
Transient Heat Conduction ◽  
Work Conditions ◽  
Turbine Rotor ◽  
Design Stage ◽  
Turbine Rotors

Thermal stress is one of the most important monitoring parameters in turbine rotors during the transition of work conditions. It has significant influence on the safety and life of turbine rotors. In order to obtain the thermal stress in turbine rotors during the transition process conveniently, the transient heat conduction process in typical structures of turbine rotors is analyzed based on heat conduction equation and finite element simulation. According to thermomechanical principle, thermal stress distributions in the typical structures of turbine rotor are investigated. The solutions of thermal stress in a solid cylinder are derived. A corner formed by shaft and disc is modeled and analyzed by finite element method, and the influences of structure parameters on thermal stresses are studied. The results on thermal stresses in cylinder and corner structures could provide a continent method to estimate thermal stress of turbine rotor on early design stage.

Non-Fourier Heat Conduction in IC Chip

1995 ◽  
Vol 117 (3) ◽  
pp. 174-177 ◽  
Author(s):  
Zeng-Yuan Guo ◽  
Yun-Sheng Xu
Keyword(s):  
Heat Conduction ◽  
Thermal Stress ◽  
Thermal Noise ◽  
Wave Model ◽  
Transient Heat Conduction ◽  
Peak Temperature ◽  
Spatial Difference ◽  
Thermal Reliability ◽  
Fourier Heat Conduction ◽  
Fourier Equation

Instead of the classic Fourier equation based on diffusion, a hyperbolic equation based on a wave model has been used to predict the rapid transient heat conduction in IC chips. The peak temperature, spatial difference, and time variation of temperature, which are critical to thermal reliability of the chip, are given and compared with that obtained from the Fourier equation. Analytical and numerical results show that non-Fourier effects, including the higher peak temperature and thermal stress, greater temperature difference between components, and stronger thermal noise, are significant to IC chip reliability.

Thermal stress analysis of eccentric tube receiver using concentrated solar radiation

Solar Energy ◽  
2010 ◽  
Vol 84 (10) ◽  
pp. 1809-1815 ◽  
Author(s):  
Fuqiang Wang ◽  
Yong Shuai ◽  
Yuan Yuan ◽  
Guo Yang ◽  
Heping Tan
Keyword(s):  
Thermal Stress ◽  
Solar Radiation ◽  
Stress Analysis ◽  
Thermal Stress Analysis ◽  
Concentrated Solar Radiation ◽  
Eccentric Tube

Thermo-Mechanical and Hygro-Mechanical Stress Analyses of an Organic Multilayer Sheet

2007 ◽  
Author(s):  
Toru Ikeda ◽  
Tomonori Mizutani ◽  
Noriyuki Miyazaki
Keyword(s):  
Liquid Crystal ◽  
Heat Conduction ◽  
Thermal Stress ◽  
Liquid Crystal Display ◽  
Mechanical Strain ◽  
Thermal Strain ◽  
Transient Heat Conduction ◽  
Fick’S Law ◽  
Fick's Law ◽  
Liquid Crystal Display Panel

A polarizing plate, which is an important part of a liquid crystal display panel, is made by sandwiching an organic polarizer between protecting films. An organic polarizer is both a hygroscopic and orthotropic material. The hygroscopic swelling and drying shrinkage of the organic polarizer can cause the polarizing plate to crack and the liquid crystal display panel to warp. The diffusion coefficient and Henry’s law coefficient were measured using a thermo-gravimetric analyzer (TGA) under controlled humidity, while the coefficient of moisture expansion (CME) was measured using a thermo-mechanical analyzer (TMA), also under controlled humidity. The thermo-mechanical and hygro-mechanical deformation of a polarizing plate was analyzed using the finite element method (FEM). This analysis was performed as follows. The distribution of the moisture concentration was analyzed according to Fick’s law. The equation of Fick’s law is similar to that of the transient heat conduction, and the FEM for the transient heat conduction was utilized for the transient diffusion analysis. The hygro-mechanical analysis was then carried out in a way similar to the thermal stress analysis. Thermal stress was analyzed separately using the FEM. Finally, the obtained hygro-mechanical strain and stress were added to the thermal strain and stress, respectively. The measured CME of a polarizing plate corresponds to the analyzed CME using the CMEs of a polarizer and protecting films. The warpage of a liquid crystal display panel sometimes causes light leakage along the frame of the display panel due to contact of the display panel with the bezel of the frame. The warpage was analyzed according to the thermo-mechanical strain and the hygro-mechanical strain. The contact between the display panel and the bezel, which causes the light leakage, was estimated.

Three-Dimensional Analysis of a Concentrated Solar Flux

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
David Riveros-Rosas ◽  
Marcelino Sánchez-González ◽  
Claudio A. Estrada
Keyword(s):  
Thermal Stress ◽  
Solar Radiation ◽  
Computer Program ◽  
Ray Tracing ◽  
Solar Irradiance ◽  
Radiation Flux ◽  
Three Dimensional ◽  
Mirror Surface ◽  
Concentrated Solar Radiation ◽  
Focal Zone

In order to improve the durability of receivers used in solar concentrating systems, it is necessary to minimize thermal stress during their operation. A possible way to do that is to design receivers in which the radiative flux density is homogeneous at the surface. For this reason, a detailed 3D study has been carried out for the distribution of concentrated solar radiation in the focal zone of a parabolic concentrator. A computer program has been developed to obtain isosurfaces of solar irradiance and achieve a homogeneous radiation flux on the receiver surface. The algorithm of the program proposes a methodology to obtain flux isosurfaces for a great variety of optical configurations. The effect of the optical errors on the mirror surface has been studied, as well as the effect of the shape of the mirror, e.g., round, square, or faceted. The numerical calculations were made using the convolution ray tracing technique.

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