thermoacoustic devices
Heat transfer processes in parallel-plate heat exchangers of thermoacoustic devices - Numerical and experimental approaches
... It is worth noting at this point that compared to the well-known types of HXs for steady flows HXs in the thermoacoustic context provide a range of new challenges. This is due to the fact that the flow is ...
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CFD study of oscillatory flow through 90º bends of thermoacoustic devices
... The current 3D CFD simulation study is performed to investigate the oscillatory flow behaviour through 90 degree bends with two different curvature radii: 1.5 and 3.6 times the pipe diameter. Time dependent flow fields ...
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Development of thermoacoustic devices for power generation and refrigeration
... suitable thermoacoustic engine topology and control measures; design of suitable heat exchanger configurations from initial use of electrical heaters to heat input through propane combustion; and characterisation ...
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Evaluation of heat exchanger on thermoacoustic performance
... for thermoacoustic devices are different from traditional ones in several key ...the thermoacoustic working fluid takes place in oscillating flow characterized by zero mean and very low instantaneous ...
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Fabrication and Performance Evaluation of Thermoacoustic Refrigerator
... The thermoacoustic devices contain no adverse chemicals or environmentally unsafe elements that are characteristics of the current refrigeration ...thennoacoustic devices: thermoacoustic ...
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Thermoacoustic refrigerator driven by a combustion-powered thermoacoustic engine - Demonstrator of device for rural areas of developing countries
... of thermoacoustic engine and refrigerator prototypes in several institutes around the world ...the thermoacoustic devices can be utilized in practical ...travelling-wave thermoacoustic engine ...
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Environmentally friendly refrigeration with thermoacoustic
... Since thermoacoustic is a new field even with respect to the rest of the world, much of the fundamentals behind its operation is still ...USA. Thermoacoustic effects involve heat exchanging process between ...
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Two-stage Looped-tube Thermoacoustic Cooler –
... makes thermoacoustic devices environmentally friendly due to the absence of the ozone depleting ...of thermoacoustic refrigerator that could be further developed into a means of thermal management of ...
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Characteristics of Acoustic Drivers for Efficient Coupling to Thermoacoustic Machines
... the thermoacoustic effect, whereby the high temperature gradient imposed on the solid material placed in gaseous medium generates sound ...reverse thermoacoustic process is possible, whereby the acoustic ...
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Development and assessment of two-stage thermoacoustic electricity generator
... in thermoacoustic technology must have flexure bearings and gas clearance seals, which require no lubrication, to make them compatible with the low-maintenance requirements of thermoacoustic ...
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A Review on Thermoacoustic Refrigeration System
... methods. Thermoacoustic engines and refrigerators were already being considered for a few years ago for specialized applications, where their simplicity, lack of lubrication and sliding seals, and their use of ...
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Design of thermoacoustic rig for the analysis of thermal and hydraulic performance of heat exchangers in oscillatory flow
... Practical thermoacoustic devices often operate at high pressures because power density is proportional to the mean pressure in the system [1], thus the rig is designed to use helium gas at mean pressure ...
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Study on A Standing Wave Thermoacoustic Refrigerator Made of Readily Available Materials
... size thermoacoustic devices can be built to operate as prime-movers or ...practical thermoacoustic apparatus in the early eighties at LANL, thermoacoustic technology has received an increasing ...
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Online Full Text
... Heat exchanger (HX) is an energy transfer component of TA system, through which heat is supplied (hot heat exchanger) or removed (cold heat exchanger) from the system. This simply means that the effectiveness of HX will ...
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Standing-wave thermoacoustic engines
... a thermoacoustic effect. We explore the basic principles of thermoacoustic engines and primarily we focus on a quarter-wavelength closed-open thermoacoustic engine as a prime mover, where temperature ...
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Thermal Management for Low-Power Handheld Electronic Devices using Thermoacoustics and Forced Convection by Vibrating Cantilever Beam.
... A thermoacoustic cooling system does not involve moving mechanical parts, except for the acoustic drivers used for producing acoustic ...makes thermoacoustic cooling systems extremely competitive compared ...
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Multiple scattering in dispersions, for long wavelength thermoacoustic solutions
... The motivation behind this work is the need to develop a theory for thermoacoustic scattering in colloids that is accurate for high concentrations. In figure (1) we compare the attenuation predicted by the ECAH ...
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Comparison of Radar and Thermoacoustic Technique in Microwave Breast Imaging
... permittivity at 3.1 GHz, is 50.3 mm. The simulation domain is truncated by 12 uniaxial perfectly-matched layers placed at half of this wavelength away from the source [21]. The parameters of the perfectly- matched layers ...
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Experimental Investigation of Thermoacoustic Driven Thermoacoustic Refrigerator
... The bottom side of the taper was welded to the small diameter tube which was made of stainless steel. The inner and outer diameter of the tube was 0.02 m and 0.024 m respectively. This 0.2 m length smaller diameter tube ...
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Measuring Sound Pressure Levels during Thermoacoustic Instabilities in Large Engines: Case Study
... Several mechanisms contribute to the occurrence of thermoacoustic instabili- ties [11]: fluctuations in the air/fuel ratio, acoustic-convective waves and entropy waves. Eddies detachment was suggested as the cause ...
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