Results 161 to 170 of about 1,767 (217)
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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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SCALING OF THERMOACOUSTIC REFRIGERATORS
AIP Conference Proceedings, 2008The possibility of scaling-down thermoacoustic refrigerators is theor. investigated. Standing-wave systems are considered as well as traveling-wave. In the former case, a ref. system is taken that consists of a resonator tube (50 cm) with a closed end and a PVC stack (length 5 cm).
Y. Li +17 more
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Design and construction of a solar-powdered, thermoacoustically driven, thermoacoustic refrigerator
The Journal of the Acoustical Society of America, 2000A thermoacoustically driven thermoacoustic refrigerator powered by solar thermal energy has been successfully built and tested. A 0.457 m diameter Fresnel lens focuses sunlight onto the hot end of a 0.0254 m diameter reticulated vitreous carbon prime mover stack, heating it to 475 °C, thereby eliminating the need for the most troublesome component in a
Adeff, Jay A., Hofler, Thomas J.
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Thermoacoustic refrigeration for space applications
Space Programs and Technologies Conference, 1991A thermoacoustic refrigerator has been designed, tested, and certified by NASA to be flown aboard the space-shuttle get-away-special (GAS) payload program on STS-42 in January 1992. This thermoacoustic heat pump uses acoustic power to pump heat from a low-temperature source to a high-temperature sink. It has only 15 g of moving mass operating at 400 Hz,
Garrett, Steven L. +2 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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The Journal of the Acoustical Society of America, 1993
Similitude is applied to thermoacoustics without using the acoustic approximation. The equations which are important to thermoacoustics (continuity, motion, and heat transfer) are rewritten in dimensionless form, verifying that the list of dimensionless variables obtained from similitude is complete.
Jeffrey R. Olson, Gregory W. Swift
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Similitude is applied to thermoacoustics without using the acoustic approximation. The equations which are important to thermoacoustics (continuity, motion, and heat transfer) are rewritten in dimensionless form, verifying that the list of dimensionless variables obtained from similitude is complete.
Jeffrey R. Olson, Gregory W. Swift
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A nonlinear model of thermoacoustic devices
The Journal of the Acoustical Society of America, 2002This paper presents a nonlinear, time-domain model of thermoacoustic devices based on cross-sectional averaged equations. Heat transfer perpendicular to the device axis—which lies at the core of thermoacoustic effects—is modeled in a novel and more realistic way. Heat conduction in the solid surfaces surrounding the fluid medium is included.
Karpov, Sergey, Prosperetti, Andrea
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Thermal Field Measurements of a Thermoacoustically Driven Thermoacoustic Refrigerator
Journal of Thermal Science and Engineering Applications, 2010Thermoacoustic refrigerator is a device that transfers heat from a low temperature medium to a high-temperature medium by using sound energy as work input. We have designed and tested a simplified thermally driven thermoacoustic refrigerator. Our refrigerator is easy to make, uses no moving parts, and has proved to be an impressive illustration of ...
Syeda Humaira Tasnim +1 more
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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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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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