Experimental study on resonance frequency of loop-tube-type thermoacoustic cooling system

Sakamoto, Shinichi; Watanabe, Yoshiaki

doi:10.1250/ast.27.361

Cited by 28 publications

(35 citation statements)

References 10 publications

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“…We can see now in this case that 𝛿 𝜈 < 𝑟 ef which means the viscous effect is relatively small and therefore the thermoacoustic prime mover is able to produce the sound with the second order requencies. This result is similar to that of Sakamoto and Watanabe (2006) that the second order frequency is generated by thermoacoustic prime mover because the working gases adjust from the viscous penetration depth by increasing their frequency to produce sound. The difference is that their experiment was carried out with a traveling wave thermoacoustic device with looped-tube configuration.…”

Section: Resultssupporting

confidence: 84%

Experimental Study of Resonance Frequency at Prime Mover Thermoacoustic Standing Wave

Cahyadi

Adhitama

Setiawan

et al. 2017

J. Phys.: Theor. Appl.

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<p class="Abstract">Thermoacoustic prime movers work by using thermal energy to produce acoustic energy in the form of sound wave through thermoacoustic effect which occurs in a porous medium called stack. This paper describes an experimental study on the relation between the order of resonance frequencies generated by a thermoacoustic prime mover and the length of the resonator and the viscous penetration depth. Extending the resonator length will decreasing the resonance frequency which result in the increasing in the viscous penetration depth. Generally, the generated sound consists of only one frequency, that is the first-order one. However, under certain conditions, the sound has only the second-order frequency or comprises two frequencies of the first-order and second-order resonance frequencies. This phenomenon can be explained by considering the comparison between the effective hydraulic radius of stack () and the viscous penetration depth (). It is found that the first-order frequency appears when , while when (with calculated by using the first-order frequency) then the second order frequency is produced so that is back to a smaller value and therefore the condition of is recovered. In addition, when of the thermoacoustic prime mover will<em> </em>generate the first and second order frequencies together.</p>

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Section: Resultssupporting

confidence: 84%

Experimental Study of Resonance Frequency at Prime Mover Thermoacoustic Standing Wave

Cahyadi

Adhitama

Setiawan

et al. 2017

J. Phys.: Theor. Appl.

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“…These can be addressed by the implementation of thermoacoustic systems. [1][2][3][4][5][6][7][8][9][10][11] A thermoacoustic system operates on the thermoacoustic phenomenon, [1][2][3][4]12) which involves mutual energy conversion and energy transport between heat and sound. The thermoacoustic phenomenon is caused by a device that consists of stacks of several cylindrical narrow channels.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it is expected to be a new energy generation method that reduces environmental impact. [9][10][11]13,14) However, several issues must be addressed before a thermoacoustic system can be used practically. One of them is that the system is large, over several meters, thereby limiting its practicality.…”

Section: Introductionmentioning

confidence: 99%

Fundamental study for heat pump stack length determination with complex flow paths in a compact thermoacoustic system

Ono¹,

Sakamoto²

2023

Jpn. J. Appl. Phys.

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The miniaturization of thermoacoustic systems is expected to find practical applications in various fields. To achieve miniaturization, we focused on the relation of the sound wave in the tube and the length of the heat-pump stack. Accordingly, three types of metal meshes with different channel diameters were prepared, and thermoacoustic systems were designed considering ωτ, a dimensionless quantity. In the experiment, the stack length was varied and the stack temperature difference and heat flow were measured. Consequently, temperature difference and heat flow with respect to the stack length were studied. In addition, even when the stack was short, temperature difference at both ends of the stack was formed. The better stack length in terms of energy efficiency was also examined. Accordingly, we confirmed that the ratio of stack length to wavelength is in the range of 0.2–0.6 %.

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“…The thermoacoustic cooling system has been studied by some research groups, [1][2][3][4][5][6] and we have also been involved with the development of a loop-tube-type thermoacoustic cooling system. [7][8][9][10][11] A temperature decrease of 40 C has been observed with our loop-tube-type thermoacoustic cooling system.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Cooling Effect of Loop-Tube-Type Thermoacoustic Cooling System Applying Phase Adjuster

Sakamoto

Imamura

Watanabe

2007

jjap

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A phase adjuster (PA) is proposed to improve the cooling effect of a loop-tube-type thermoacoustic cooling system. A PA is a device for accelerating the particle velocity. The PA is embedded in the loop tube and narrows the cross-sectional area of the part of the loop tube. The PA creates a strong boundary condition in which the particle velocity is accelerated. It is confirmed that the phases of the sound pressure and particle velocity are adjusted so that the sound generated in the loop tube is resonated with the total tube length at one-wavelength resonance. This results in a great improvement in the cooling effect of the thermoacoustic cooling system.

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Experimental study on resonance frequency of loop-tube-type thermoacoustic cooling system

Cited by 28 publications

References 10 publications

Experimental Study of Resonance Frequency at Prime Mover Thermoacoustic Standing Wave

Experimental Study of Resonance Frequency at Prime Mover Thermoacoustic Standing Wave

Fundamental study for heat pump stack length determination with complex flow paths in a compact thermoacoustic system

Improvement of Cooling Effect of Loop-Tube-Type Thermoacoustic Cooling System Applying Phase Adjuster

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