Coherent acoustic wave amplification/damping by wrinkled flames

2005 ◽  
Vol 279 (3-5) ◽  
pp. 669-686 ◽  
Author(s):  
T. Lieuwen ◽  
Ju Hyeong Cho
Keyword(s):  
Acoustic Wave ◽  
Wave Amplification

scholarly journals Surface acoustic wave amplification by direct current-voltage supplied to graphene film

2015 ◽  
Vol 106 (2) ◽  
pp. 023505 ◽  
Author(s):  
Z. Insepov ◽  
E. Emelin ◽  
O. Kononenko ◽  
D. V. Roshchupkin ◽  
K. B. Tnyshtykbayev ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Direct Current ◽  
Graphene Film ◽  
Wave Amplification ◽  
Current Voltage ◽  
Direct Current Voltage

Acousto–electric interaction in inhomogeneous semiconductor quantum plasma

2017 ◽  
Vol 31 (28) ◽  
pp. 1750207 ◽  
Author(s):  
S. Ghosh ◽  
Apurva Muley
Keyword(s):  
Acoustic Wave ◽  
Plasma Density ◽  
Resonance Condition ◽  
Propagation Distance ◽  
Quantum Plasma ◽  
Crossover Point ◽  
Modified Dispersion Relation ◽  
Density Region ◽  
Wave Amplification ◽  
Inhomogeneous Semiconductor

In the present paper, an analytical study has been presented to examine the acousto–electric interactions in piezoelectric inhomogeneous semiconductor quantum plasma. The analysis is made by deriving the quantum-modified dispersion relation and subsequently deducing the expression of gain coefficient of acoustic wave using quantum hydrodynamic (QHD) model for inhomogeneous semiconductor plasma. The linearly and quadratically varying plasma density profiles have been chosen to investigate the effects of inhomogeneity through density gradient. We address the role of quantum parameter-H, scale length of density variation L and propagation distance z on gain profiles of acoustic wave. It has been found that the presence of these parameters can significantly modify the crossover and resonance characteristics of acoustic wave. Results reveal that the crossover point for wave amplification is found to be greater than unity in inhomogeneous quantum plasma media while the resonance condition is effectively influenced by these parameters in all the considered cases. We found that more acoustic gain would be possible if the acoustic mode propagates from low to high plasma density region in the medium. It is also found that as the medium tends to have high inhomogeneity, more pronounced modifications on resonance characteristics of acoustic wave are expected.

Acoustic wave amplification in polar semiconductors

1974 ◽  
Vol 49 (1) ◽  
pp. 39-40 ◽  
Author(s):  
S.S Kubakaddi ◽  
B.S Krishnamurthy
Keyword(s):  
Acoustic Wave ◽  
Wave Amplification

Acoustic wave amplification in a plasma of a molecular gaseous discharge

2002 ◽  
Vol 48 (3) ◽  
pp. 268-272 ◽  
Author(s):  
G. A. Galechyan ◽  
A. R. Mkrtchyan
Keyword(s):  
Acoustic Wave ◽  
Wave Amplification ◽  
Gaseous Discharge

Study of Wall Thickness and Material Effect on Acoustic Wave Propagation in Water-Filled Piping

2012 ◽  
Author(s):  
Alireza Mokhtari ◽  
Vijay Chatoorgoon
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Resonant Frequency ◽  
Wall Thickness ◽  
Power Plants ◽  
Linear Wave ◽  
Acoustic Wave Propagation ◽  
Frequency Shifts ◽  
Wave Amplification ◽  
Piping Systems

The operation of many industries, such as power plants or many piping systems, demands knowledge of generated pressure pulsations. The effect of acoustic wave amplification in piping systems can be detrimental to the integrity and life of whole plant. Therefore, understanding of the nature of acoustic wave propagation in water filled piping systems needs to be established based on fundamental experiments and analysis. Chatoorgoon et al. [1] and Rzentkowski et al. [2], compared their no flow experiments with theoretical calculation, and realized that the resonant frequency shifts increased linearly, with resonant frequency increasing. This paper presents an experimental study showing that linear wave theory, based on a transmission matrix method does predict well the acoustic resonance frequency from 50 to 500 Hz. and the resonant frequency shifts were negligible. Study of tube wall thickness, material (stainless steel and Aluminum) and some equal branch configurations for “Closed-end” tubes are discussed.

Sign in / Sign up

Export Citation Format

Share Document