Results 141 to 150 of about 219 (182)

Nonlinear processes in thermoacoustic engines

The Journal of the Acoustical Society of America, 1994
In the first part of the paper it is shown how, on the basis of a different form of the energy equation, a more compact derivation of the Rott theory of thermoacoustic effects [N. Rott, Z. Angew. Math. Phys. 20, 230–243 (1969)] can be given. In the second part, a weakly nonlinear theory is built starting from the same formulation and the steady-state ...
A. Prosperetti, M. Watanabe
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Liquid-sodium thermoacoustic engine

Applied Physics Letters, 1988
We have constructed a thermoacoustic engine that uses liquid sodium as its working substance. The engine generates acoustic power using heat flowing from a high-temperature source to a low-temperature sink. The measured performance of this engine disagrees significantly with numerical calculations based on our theory of thermoacoustic engines.
A. Migliori, G. W. Swift
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A high performance thermoacoustic engine

Journal of Applied Physics, 2011
In thermoacoustic systems heat is converted into acoustic energy and vice versa. These systems use inert gases as working medium and have no moving parts which makes the thermoacoustic technology a serious alternative to produce mechanical or electrical power, cooling power, and heating in a sustainable and environmentally friendly way.
M. E. H. Tijani, S. Spoelstra
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Simulating a Thermoacoustic Engine With PyFR

2023
Thermoacoustic engines can convert heat into acoustic energy, generating powerful acoustic waves that can be used for electricity generation, cooling and additional uses. Simulating them and predicting their performance is a challenging task, due to the multiple length and time scales involved, the characteristics of the flow (compressible, transient),
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Introduction to Thermoacoustic Engines and Refrigerators

Noise Control and Acoustics, 2001
Abstract Glassblowers observed the generation of sound in the presence of temperature gradients over one hundred years ago. It was less than twenty years ago that the reverse process — the use of high-amplitude sound to produce refrigeration — was first demonstrated. Due to the discovery of the “hole-in-the-ozone” and the ratification of
Matthew E. Poese, Steven L. Garrett
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Unconventional thermoacoustic heat engines

The Journal of the Acoustical Society of America, 2006
During 1988 to 1994, John Strachen and Harold Aspden demonstrated an all-solid-state thermoelastic cooler which was 0.5 cm thick and a few centimeters in length. With 7.2 V dc applied across the device, it drew 6.3 W of electrical power and produced 13.7 W of cooling power with a 20<th>°C temperature drop.
Matthew G. Hilt, K. A. Pestka, G. D. Mahan, J. D. Maynard, D. Pickrell, B. Na, J. Tamburini   +6 more
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Streaming in thermoacoustic engines and refrigerators

AIP Conference Proceedings, 2000
The efficiency of thermoacoustic engines and refrigerators is now approaching 40% of the ideal efficiency allowed by the laws of thermodynamics. To achieve such high efficiency requires understanding and control of streaming. Sometimes, thermoacoustic phenomena cause unwanted streaming-driven convection of heat, which we strive to eliminate; in other ...
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Entrainment of two thermoacoustic engines

Journal of the Acoustical Society of America, 2016
In order to build more powerful sources of sound for energy conversion, the synchronization of two thermoacoustic heat engines has been studied. Experiments were performed on engines in the acoustic frequency range of 2.6 kHz and also on very small engines in the ultrasonic range of 24 kHz.
Orest G. Symko, Myra Flitcroft, Brenna Gillman, Ivan Rodriguez, Cedric C. Wilson   +4 more
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Radial wave thermoacoustic engines

The Journal of the Acoustical Society of America, 1992
Thermoacoustic heat engines are used to produce sound from heat and to transport heat using sound. Most previous work has concentrated on engines in plane-wave resonators. This paper is about the analysis of engines in radial mode cylindrical resonators.
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Parametric Optimization for Thermoacoustic Refrigerator Driven by Thermoacoustic Engine

International Conference on Fluid Flow, Heat and Mass Transfer, 2022
Ussama Ali, Md Islam, Isam Janajreh
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