Transient Temperature Variation in a Thermally Orthotropic Plate

ARS Journal ◽  
1962 ◽  
Vol 32 (12) ◽  
pp. 1902-1909 ◽  
Author(s):  
W. H. GIEDT ◽  
D. R. HORNBAKER
Keyword(s):  
Temperature Variation ◽  
Orthotropic Plate ◽  
Transient Temperature

Thermo-mechanical analysis of a FGM plate subjected to thermal shock – A new numerical approach considering real time temperature dependent material properties

2021 ◽  
Vol 63 (4) ◽  
pp. 341-349
Author(s):  
Mete Onur Kaman ◽  
Nevin Celik ◽  
Resul Das
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Thermal Shock ◽  
Temperature Variation ◽  
Material Properties ◽  
Ambient Air ◽  
Transient Temperature ◽  
Heated Plate ◽  
The Heat Transfer Coefficient

Abstract In present the study, sudden cooling, in other words thermal shock, is applied to a plate that is originally a functionally graded material (FGM). The flat plate is assumed to have an edge crack on it. Hence a numerical couple-field analysis is performed on the plate. The FGM is a combination of Ni and Al2O3. The thermal and mechanical properties of the FGM are assumed to depend on temperature variation. The mixing percentages of the Ni and Al2O3 throughout the plate are considered to vary (i) linearly, (ii) quadratically and (iii) in half-order. In order to solve the problem, a new subroutine depending on temperature is written using APDL (ANSYS Parametric Design Language) codes. Three values of the heat transfer coefficient are applied to the initially heated plate. As a result, the transient temperature variation and stress intensity factor are presented to show the thermo-mechanical relation of the plate. The material properties changing with temperature results in more reliable temperature values. Increasing the heat transfer coefficient results in better cooling and in a lesser amount of time to reach ambient air temperature.

Transient Temperature Variation of Injection Lasers

1981 ◽  
Vol 20 (6) ◽  
pp. L395-L398 ◽  
Author(s):  
Masuo Suyama ◽  
Nagaatsu Ogasawara ◽  
Ryoichi Ito
Keyword(s):  
Temperature Variation ◽  
Transient Temperature ◽  
Injection Lasers

Experimental Study on Hot Lubricating Oil Anti-Icing System of Aero-Engine Strut

2014 ◽  
Author(s):  
Wei Dong ◽  
Jianjun Zhu ◽  
Yong Chen ◽  
Zhixiang Zhou
Keyword(s):  
Experimental Study ◽  
Wind Tunnel ◽  
Temperature Variation ◽  
Mass Flow ◽  
Test Section ◽  
Liquid Water Content ◽  
Lubricating Oil ◽  
Electric Heater ◽  
Transient Temperature ◽  
Aero Engine

This paper presents an experimental study on the performance of hot oil anti-icing system of aero-engine strut in icing wind tunnel. The experiments are performed in YBF-02 icing wind tunnel. The YBF-02 icing wind tunnel has a test section of 0.28m width and 0.18m height. With the limitation of model blocking, airspeed up to 200m/s can be achieved. A refrigeration system can provide the test-section with temperature from −25°C to 0°C. The experimental model is a full-scale inlet strut of a turboshaft engine. The hot lubricating oil flows through the internal passage of the strut and heats the strut to prevent the strut from ice accretion on its surface. In experiments, the hot oil was heated by an electric heater. The temperature and mass flow of the oil are controlled by Programmable logic controller (PLC) system. The temperature distributions on the strut surface are measured by T type thermocouples. The icing environment parameters in icing wind tunnel for engine strut are: the air total temperature is −10°C,-5°C; the airspeed is 40m/s; the liquid water content ranges from 0.5g/m3 to 2.0g/ m3; the median volume diameter (MVD) of the super-cooled droplet is 20μ m. The surface temperatures of the strut and the ice shape accreted on the strut are measured and photographed. The transient temperature variation of the strut surface is recorded in hot oil anti-icing tests. The characteristics of ice shape and temperature variation on the strut surface with a hot oil anti-icing system are analyzed. The effects of temperature and mass flow of hot oil on the performance of the anti-icing system under different icing conditions are studied.

Reliability Analysis on the Chaos Induced by the Effect of the Transient Temperature Variation of a Printed Wiring Board

2001 ◽  
Author(s):  
Xiaoling He ◽  
Robert Fulton
Keyword(s):  
Temperature Variation ◽  
Thermal Loading ◽  
Chaotic Behavior ◽  
Mechanical Load ◽  
Harmonic Excitation ◽  
Transient Temperature ◽  
Printed Wiring Board ◽  
Load Effect ◽  
Temporal Oscillation ◽  
Wiring Board

Abstract The transient response of a printed wiring board (PWB) under mechanical and thermal loading is analyzed. The thermal load is caused by the time-dependent temperature variation of the PWB. Analytical solution is obtained for the equation of motion in nonlinear dynamics analysis. Numerical results showed that the response is in chaotic behavior under harmonic excitation due to the transient thermal effect. PWB response is characterized with respect to the thermal and mechanical load effect in both phase diagram and temporal oscillation.

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