Results 151 to 160 of about 11,617 (186)
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An experimental thermoacoustically driven thermoacoustic refrigerator
The Journal of the Acoustical Society of America, 1996The construction of a thermoacoustically (heat) driven, thermoacoustic refrigerator (TADTAR) is nearing completion. The design utilizes a novel resonator topology and high-efficiency primary heat exchangers. Numerical models suggest a cooling power level of at least 500 W over a temperature span of 40 °C.
Thomas J. Hofler +3 more
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The Journal of the Acoustical Society of America, 2000
The ‘‘stack’’ used in conventional standing-wave thermoacoustics depends on intrinsic thermodynamic irreversibilities for its operation. One approach to increasing efficiency is to eliminate the stack, retaining a small gap between heat exchangers in a standing wave.
Ray Scott Wakeland, Robert M. Keolian
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The ‘‘stack’’ used in conventional standing-wave thermoacoustics depends on intrinsic thermodynamic irreversibilities for its operation. One approach to increasing efficiency is to eliminate the stack, retaining a small gap between heat exchangers in a standing wave.
Ray Scott Wakeland, Robert M. Keolian
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The Journal of the Acoustical Society of America, 2000
The high rate of heat transfer (up to 500 MW/m2) which can be achieved by explosive bubbles has long been recognized. This process finds a widening range of application from microsurgery to computer peripherals design. The best-known example is the thermal ink-jet printer, where an ultrahigh heat flux applied for short duration of about 6 μs induces ...
Ran Yaron +3 more
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The high rate of heat transfer (up to 500 MW/m2) which can be achieved by explosive bubbles has long been recognized. This process finds a widening range of application from microsurgery to computer peripherals design. The best-known example is the thermal ink-jet printer, where an ultrahigh heat flux applied for short duration of about 6 μs induces ...
Ran Yaron +3 more
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Applied Physics Letters, 2020
In this study, we developed microwave-induced thermoacoustic endoscopy (TAE), which employs a high-repetition-rate pulsed microwave generator for external excitation and a side-view focused ultrasound transducer for internal acoustic detection. The system yields a lateral resolution of 1.5 mm and an axial resolution of 0.35 mm.
Xiao Liang +5 more
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In this study, we developed microwave-induced thermoacoustic endoscopy (TAE), which employs a high-repetition-rate pulsed microwave generator for external excitation and a side-view focused ultrasound transducer for internal acoustic detection. The system yields a lateral resolution of 1.5 mm and an axial resolution of 0.35 mm.
Xiao Liang +5 more
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A cascade thermoacoustic engine
The Journal of the Acoustical Society of America, 2003A cascade thermoacoustic engine is described, consisting of one standing-wave stage plus two traveling-wave stages in series. Most of the acoustic power is produced in the efficient traveling-wave stages. The straight-line series configuration is easy to build and allows no Gedeon streaming.
Gardner, David Lee, Swift, Gregory
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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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The Journal of the Acoustical Society of America, 1999
The two procedures mainly used for determining ultrasonic power—the sound radiation force method and the planar scanning technique—are complicated, and require a relatively expensive measuring setup. These procedures are therefore unsuitable for the routine inspection of ultrasonic equipment used in medical and technical applications.
Burkhard Fay, Hans-Peter Reimann
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The two procedures mainly used for determining ultrasonic power—the sound radiation force method and the planar scanning technique—are complicated, and require a relatively expensive measuring setup. These procedures are therefore unsuitable for the routine inspection of ultrasonic equipment used in medical and technical applications.
Burkhard Fay, Hans-Peter Reimann
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Improvements in an experimental thermoacoustically driven thermoacoustic refrigerator
The Journal of the Acoustical Society of America, 1997A thermoacoustically (heat) driven, thermoacoustic refrigerator apparatus, having a novel topology, has produced significant cooling power and efficiency. It has achieved a cooling temperature span of 60 °C, and 91 W of cooling power at a span of 25 °C, with an overall COP of 0.15. These numbers were produced with a porous carbon refrigerator stack and
Thomas J. Hofler, Jay A. Adeff
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Thermoacoustically driven triboelectric nanogenerator: Combining thermoacoustics and nanoscience
Applied Physics Letters, 2017A thermoacoustic heat engine (TAHE) is a type of regenerative heat engine that converts external heat into mechanical power in the form of an acoustic wave with no moving mechanical components. One significant application of the TAHE is the generation of electricity by coupling an acoustic-to-electric conversion unit such as a linear motor or a ...
Shunmin Zhu +6 more
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Thermoacoustically driven refrigerator with double thermoacoustic-Stirling cycles
Applied Physics Letters, 2006Recently, considerable research efforts have been made to search substitution technologies for chlorofluorocarbon-based vapor compression cycles due to the concern over environmental issues. This letter introduces a helium-based thermoacoustic refrigeration system, which is a thermoacoustic-Stirling refrigerator driven by a thermoacoustic-Stirling heat
Ercang Luo +3 more
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