Effect of electrical boundary conditions on the propagation of axisymmetric acoustoelectric waves in a hollow cylinder with axial polarization

1987 ◽  
Vol 23 (9) ◽  
pp. 832-835 ◽  
Author(s):  
I. A. Loza ◽  
N. A. Shul'ga
Keyword(s):  
Boundary Conditions ◽  
Hollow Cylinder ◽  
Electrical Boundary Conditions ◽  
Axial Polarization

Transient Heat Transfer of a Hollow Cylinder Subjected to Periodic Boundary Conditions

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Yujia Sun ◽  
Xiaobing Zhang
Keyword(s):  
Heat Transfer ◽  
Boundary Conditions ◽  
Hollow Cylinder ◽  
Periodic Boundary ◽  
Periodic Boundary Conditions ◽  
Transient Heat Transfer ◽  
Maximum Temperature ◽  
Water Cooling ◽  
Chromium Plating ◽  
Inner Surface

The purpose of this paper is to study the transient temperature responses of a hollow cylinder subjected to periodic boundary conditions, which comprises with a short heating period (a few milliseconds) and a relative long cooling period (a few seconds). During the heating process, the inner surface is under complex convection heat transfer condition, which is not so easy to approximate. This paper first calculated the gas temperature history and the convective heat transfer coefficient history between the gas flow and the inner surface and then they were applied to the inner surface as boundary conditions. Finite element analysis was used to solve the transient heat transfer equations of the hollow cylinder. Results show that the inner surface is under strong thermal impact and large temperature gradient occurs in the region adjacent to the inner surface. Sometimes chromium plating and water cooling are used to relief the thermal shock of a tube under such thermal conditions. The effects of these methods are analyzed, and it indicates that the chromium plating can reduce the maximum temperature of the inner surface for the first cycle during periodic heating and the water cooling method can reduce the growth trend of the maximum temperature for sustained conditions. We also investigate the effects of different parameters on the maximum temperature of the inner surface, like chromium thickness, water velocity, channel diameter, and number of cooling channels.

scholarly journals Non-reciprocal behavior of one-dimensional piezoelectric structures with space-time modulated electrical boundary conditions

2019 ◽  
Vol 126 (14) ◽  
pp. 145108 ◽  
Author(s):  
C. Croënne ◽  
J. O. Vasseur ◽  
O. Bou Matar ◽  
A.-C. Hladky-Hennion ◽  
B. Dubus
Keyword(s):  
Boundary Conditions ◽  
Space Time ◽  
One Dimensional ◽  
Electrical Boundary Conditions ◽  
Piezoelectric Structures

scholarly journals Optimization of a Tunable Piezoelectric Resonator Using Phononic Crystals with Periodic Electrical Boundary Conditions

2015 ◽  
Vol 70 ◽  
pp. 258-261 ◽  
Author(s):  
Marie-Fraise Ponge ◽  
Bertrand Dubus ◽  
Christian Granger ◽  
Jérôme Vasseur ◽  
Mai Pham Thi ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Phononic Crystals ◽  
Piezoelectric Resonator ◽  
Electrical Boundary Conditions

scholarly journals Properties ofPb(Zr,Ti)O3ultrathin films under stress-free and open-circuit electrical boundary conditions

2004 ◽  
Vol 70 (22) ◽  
Author(s):  
Emad Almahmoud ◽  
Yulia Navtsenya ◽  
Igor Kornev ◽  
Huaxiang Fu ◽  
L. Bellaiche
Keyword(s):  
Boundary Conditions ◽  
Open Circuit ◽  
Electrical Boundary Conditions

scholarly journals Thermoelastic Behavior Inthin Hollow Cylinder using Internal Moving Heat Source

2019 ◽  
Vol 9 (2) ◽  
pp. 2578-2583
Keyword(s):  
Temperature Distribution ◽  
Heat Source ◽  
Boundary Conditions ◽  
Hollow Cylinder ◽  
Infinite Series ◽  
Thermal Stresses ◽  
Integral Transform ◽  
Elastic Problem ◽  
Moving Heat Source ◽  
Integral Transform Technique

A hollow cylinder having cylindrical hole at the center has been examined under the temperature variation condition. This composition deals with study of temperature distribution in thin hollow cylinder and corresponding stresses. The author has worked to carry out the transient thermo elastic problem for evaluation of temperature distribution, displacement and thermal stresses of a thin hollow cylinder. The known non homogeneous boundary conditions are applied to obtain the solution of this problem. The integral transform technique yields the solution to the problem. The analysis contains an infinite series. The variation of said parameters observed and analyzed by using necessary graphs

scholarly journals Models of the interaction between electrons and polar optical phonons in nanostructures

2016 ◽  
Vol 55 (4) ◽  
Author(s):  
Brian K. Ridley
Keyword(s):  
Boundary Conditions ◽  
Linear Combination ◽  
Optical Phonons ◽  
Coupled Mode ◽  
Electrical Boundary Conditions ◽  
Optical Modes ◽  
Simple Models

A brief summary is made of the models used to describe the interaction between electrons and polar optical phonons in nanostructures. Simpler models are compared with the model that describes optical modes that satisfy both mechanical and electrical boundary conditions. Satisfaction of these boundary conditions requires modes to be a linear combination (LC) of longitudinal (LO), transverse (TO) and interface (IF) modes. The role of lattice dispersion turns out to be crucial. If accuracy is not essential, the simple models can provide adequate results, provided that coupled-mode and hot-phonon effects are absent.

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