Results 181 to 190 of about 2,856 (222)
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A thermoacoustic Stirling heat engine
Nature, 1999Electrical and mechanical power, together with other forms of useful work, are generated worldwide at a rate of about 1012 watts, mostly using heat engines. The efficiency of such engines is limited by the laws of thermodynamics and by practical considerations such as the cost of building and operating them.
S. Backhaus, G. W. Swift
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A high performance thermoacoustic engine
Journal of Applied Physics, 2011In 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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Liquid-sodium thermoacoustic engine
Applied Physics Letters, 1988We 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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Entrainment of two thermoacoustic engines
Journal of the Acoustical Society of America, 2016In 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 +4 more
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Streaming in thermoacoustic engines and refrigerators
AIP Conference Proceedings, 2000The 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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Simulating a Thermoacoustic Engine With PyFR
2023Thermoacoustic 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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Resonator coiling in thermoacoustic engines
The Journal of the Acoustical Society of America, 1995Coiling the resonator of a thermoacoustic engine is one way to try to minimize the engine’s size. However, flow in bent pipes is known to alter the fluid flow pattern because of centrifugal forces. Theory and measurements will be presented on the energy dissipation caused by oscillating flow in curved pipes.
Jeffrey R. Olson, Gregory W. Swift
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Radial wave thermoacoustic engines
The Journal of the Acoustical Society of America, 1992Thermoacoustic 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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Introduction to Thermoacoustic Engines and Refrigerators
Noise Control and Acoustics, 2001Abstract 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, 2006During 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 +6 more
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