An Experimental Investigation of Sample–Fluid Heat Coupling Effect in Thermal Lens Technique

2020 ◽  
Vol 74 (10) ◽  
pp. 1274-1279
Author(s):  
Gustavo V.B. Lukasievicz ◽  
Leandro S. Herculano ◽  
Elizandra Sehn ◽  
Marcos P. Belançon ◽  
Stephen E. Bialkowski ◽  
...  

Laser-induced wavefront distortion is detectable by several techniques based on the photothermal effect. The effect is probed by monitoring the phase shift caused by the bulging of the heated area, the photoelastic effects, and the spatial distribution of the refractive index within the sample and in the fluid surrounding it. A simple analytical solution for the wavefront distortion was only possible for low absorbing materials, with the assumption that the stresses obey either the thin-disk or the long-rod type distributions. Recently, a unified theoretical description for the laser-induced optical path change was proposed to overcome part of this limitation for weakly absorbing materials, regardless of its thickness. In this work, we perform an experimental investigation taking the sample–fluid heat coupling effect into account using the thermal lens technique. The experimental investigation presented here validates the unified model. In addition, we show that the heat-coupling model provides an alternative method to obtain physical properties of non-absorbing fluid by using a reference solid sample.

Optik ◽  
2021 ◽  
pp. 167826
Author(s):  
Mohammad Reza Moghaddam ◽  
Davood Razzaghi ◽  
Marzieh Akbari ◽  
Mohammad Barzan ◽  
Mohsen Ruzbehani

2010 ◽  
Vol 65 (7) ◽  
pp. 713-725 ◽  
Author(s):  
M. A. Proskurnin ◽  
E. V. Ageeva ◽  
A. A. Shelepchikov ◽  
V. V. Senyuta

2014 ◽  
Vol 602-605 ◽  
pp. 365-369
Author(s):  
Jun Yan ◽  
Yin Qi Wei ◽  
Hong Cai

s: Temperature, seepage and deformation are the important parts of the engineering geological mechanics both in water conservancy and hydropower engineering since there are highly nonlinear complex coupling effect between each other. In this paper, the earth and rock mass are classified as continuous porous media. The thermal constitutive relation of porous media and motion regularity of pore fluid are deduced from the basic theory of solid mechanics, hydraulics, and thermodynamics. Based on momentum, mass and energy conservation equations, the multi-field controlling equations of unsaturated porous media are given, in which the unknown variables include displacements, pore liquid pressure, pore gas pressure, temperature, and porosity.


2000 ◽  
Vol 10 (PR9) ◽  
pp. Pr9-589-Pr9-594 ◽  
Author(s):  
F. Malaise ◽  
F. Collombet ◽  
J. Y. Tranchet

2010 ◽  
Vol 44-47 ◽  
pp. 2075-2079
Author(s):  
Xu Dong Dai ◽  
Zheng Shan Zhang ◽  
Xiang Hui Meng ◽  
Zhi Nan Zhang ◽  
You Bai Xie

The paper analyzes the coupling of multi-disciplinary behaviors, including system dynamical behavior, combustion behavior and tribological behavior, of the cylinder liner-piston-rod-crank system in IC engine. Based on the state equation method, multi-disciplinary behavior coupling model of the Cylinder-Piston-Rod-Crank system is constructed and a multi-disciplinary behavior coupling analysis method in IC engine is presented on the basis of the state equation. With the coupling analysis model, the coupling effect of multi-disciplinary behaviors can be considered in the two sequential state calculations. By means of state calculation in time domain, the coupling effect of multi-disciplinary behaviors on life performance of IC engine can be predicted.


2019 ◽  
Vol 23 (1) ◽  
pp. 160-173
Author(s):  
Enli Chen ◽  
Xia Zhang ◽  
Gaolei Wang

Steel–concrete bridges on highways are now widely used, and their dynamic coupling effect is more prominent under heavy vehicles. At present, for the study of vehicle–bridge coupling, it is difficult to reflect the mechanical response characteristics of the bridge pavement because the bridge pavement (road) is often considered as a load. In order to get closer to reality, we use the whole vehicle model and the bridge model to realize the dynamic coupling of highway vehicle–bridge. Moreover, the vehicle model can take into account tire characteristics, such as various linear and nonlinear suspension characteristics, and tire–ground contact characteristics. So, a new vehicle–road–bridge interaction method with higher computational efficiency is proposed. This method can be used not only to analyze the overall mechanical response of bridge structure such as deflection and stress but also to analyze the dynamic characteristics of driving vehicles and the coupling force between tires and pavement and then to analyze the dynamic deformation and stress of asphalt pavement layers on the bridge. First, according to the construction drawings of a steel–concrete bridge on a highway and a Dongfeng brand three-axle vehicle, a vehicle–road–bridge interaction rigid–flexible coupling model was established. Second, the correctness and effectiveness of the vehicle–road–bridge interaction model were verified by field testing. Finally, the dynamic response of the vehicle–road–bridge interaction rigid–flexible coupling model was analyzed.


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