Results 171 to 180 of about 2,856 (222)
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Working gases in thermoacoustic engines
The Journal of the Acoustical Society of America, 1999The best working gases for thermoacoustic refrigeration have high ratios of specific heats and low Prandtl numbers. These properties can be optimized by the use of a mixture of light and heavy noble gases. In this paper it is shown that light noble gas–heavy polyatomic gas mixtures can result in useful working gases.
J R, Belcher +4 more
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Non-linear phenomena in thermoacoustic engines
Journal of Non-Equilibrium Thermodynamics, 2004zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Rivera-Alvarez, Alejandro, Chejne, Farid
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A loaded thermoacoustic engine
The Journal of the Acoustical Society of America, 1995Measurements and analysis of the performance of a thermoacoustic engine driving a dissipative load are presented. The effect of the load can be explained qualitatively using a simple low-amplitude approximation and quantitatively by invoking a more accurate low-amplitude numerical solution. The heater power Q̇ and hot-end temperature TH are found to be
J. R. Olson, G. W. Swift
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Streaming in thermoacoustic engines
The Journal of the Acoustical Society of America, 1999Thermoacoustics utilizes an acoustic process to transport heat. Interestingly enough, sound sources that move essentially in a sinusoidal manner often do not yield flow fields of a sinusoidal nature. In addition to the oscillation of each fluid element contributing to the acoustic system, there can exist a pattern of steady vortices or other time ...
Gordon Smith, Richard Raspet, Henry Bass
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A Thermoacoustic Engine Design
Volume 2: 31st Computers and Information in Engineering Conference, Parts A and B, 2011This paper discusses basic standing wave theory as it relates to thermoacoustics as well as the design, construction, and testing of a simple thermoacoustic engine based upon these principles. This paper covers the design, construction, and testing of a proof-of-concept engine to demonstrate the possibility of converting heat energy into mechanical ...
Evan Wind +4 more
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The Journal of the Acoustical Society of America, 2003
Over the past several years, Los Alamos has successfully fabricated and tested traveling wave thermoacoustic heat engines having efficiencies much greater than those of traditional standing wave thermoacoustic engines. Unfortunately, Gedeon streaming effects present in these traveling wave engines has required using fluid flow ‘‘diodes’’ having greater
D. L. Gardner, G. W. Swift
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Over the past several years, Los Alamos has successfully fabricated and tested traveling wave thermoacoustic heat engines having efficiencies much greater than those of traditional standing wave thermoacoustic engines. Unfortunately, Gedeon streaming effects present in these traveling wave engines has required using fluid flow ‘‘diodes’’ having greater
D. L. Gardner, G. W. Swift
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The Journal of the Acoustical Society of America, 1988
Thermoacoustic engines, or acoustic heat engines, are energy-conversion devices that achieve simplicity and concomitant reliability by use of acoustic technology. Their efficiency can be a substantial fraction of Carnot’s efficiency. In thermoacoustic prime movers, heat flow from a high-temperature source to a low-temperature sink generates acoustic ...
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Thermoacoustic engines, or acoustic heat engines, are energy-conversion devices that achieve simplicity and concomitant reliability by use of acoustic technology. Their efficiency can be a substantial fraction of Carnot’s efficiency. In thermoacoustic prime movers, heat flow from a high-temperature source to a low-temperature sink generates acoustic ...
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Thermoacoustic engines and refrigerators
AIP Conference Proceedings, 2012Thermoacoustic engines and refrigerators use gas inertia and compressibility to eliminate many of the mechanical contrivances required by traditional engines and refrigerators while providing potentially attractive options that might reduce environmental impacts.
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Nonlinear processes in thermoacoustic engines
The Journal of the Acoustical Society of America, 1994In 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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Annular thermoacoustic engines
AIP Conference Proceedings, 2000The goal of this paper is to describe some of the properties of single- and dual-stack annular thermoacoustic engines. It is explained that the single-stack configuration is not well suited for operation under parameters typical of standing-wave thermoacoustics.
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