Gap separation effect on thermoacoustic wave generation by heated suspended CNT nano-thinfilm

Tong, L. H.; Lim, C.W.; Lai, Shih-Kung; Li, Y. C.

doi:10.1016/j.applthermaleng.2015.04.031

Cited by 26 publications

(15 citation statements)

References 26 publications

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“…These studies demonstrate the influence of frequency, input power, microstructure and backing on the acoustics performance of the carbon nanostructured materials, obtained from the conducted experiments. An extensive theoretical analysis of the thermoacoustic sound generation in many different configurations is available [4,16,[28][29][30][31][32][33][34]. However, due to the unique and complex microstructure of 3D-C, very few models have been adapted to fit its geometry precisely.…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization of three-dimensional Graphene’s thermoacoustic response and its theoretical modelling

Ngoh

Guiraud

Tan

et al. 2020

Carbon

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In the past decade, a lot of research has been conducted on the potential of carbon nanostructured materials to emit sound via thermoacoustics through both simulations and experiments. However, experimental validation of simulations for three-dimensional graphene (3D-C), which has a complicated 3D structure, has yet to be achieved. In this paper, 3D-C is synthesized via thermal chemical vapor deposition and its microstructure and quality tested using Scanning Electron Microscopy and Raman spectroscopy respectively. Then, a two temperature model is used to predict the effects of numerous parameters: frequency, input power, sample size, connection area, connection path, pores per inch, thickness, compression as well as the addition of a backing on the acoustic performance and temperature of the 2 sample. The experimental results presented in this paper validate the predictions of the adopted two temperature model. The efficiency of 3D-C is then compared with results presented in other studies to understand how the presented 3D-C fared against ones from the literature as well as other carbon nanostructured materials.

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Section: Introductionmentioning

confidence: 99%

Experimental characterization of three-dimensional Graphene’s thermoacoustic response and its theoretical modelling

Ngoh

Guiraud

Tan

et al. 2020

Carbon

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“…Because the contribution of the varying acoustic pressure to the temperature field is insignificant [21], the coupled term ∂ P /∂t in Eq. (1) can be omitted, then the nonhomogeneous term in Eq.…”

Section: Solid Cylindrical Thermo-acoustic Transductionmentioning

confidence: 99%

“…6 for different solids. The rate of heat loss per unit area β 0 is chosen as 15 W/m 2 /K [21]. The thinfilm is still the monolayer graphene.…”

Section: Acoustic Pressure Of Thinfilm-solid Cylindrical Transductionmentioning

confidence: 99%

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Theory and modeling of cylindrical thermo-acoustic transduction

et al. 2016

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“…17 The same approach has been adopted to study the plane waves propagation in different thermophone configurations, such as the free field geometry, 18 and the thermophone on substrate with an air gap. 19 Lastly, a multilayer model taking the wave propagation in the solid thermophone layer into account has been proposed. 20 In most models, the generating thermophone layer is considered as a homogeneous solid material.…”

Section: Introductionmentioning

confidence: 99%

Two temperature model for thermoacoustic sound generation in thick porous thermophones

Guiraud

Giordano

Matar

et al. 2019

Journal of Applied Physics

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The thermoacoustic sound generation offers a promising wideband alternative to mechanically driven loudspeakers. Over the past decade, the development of nanomaterials with new physico-chemical properties promoted a wide interest in the thermophones technology. Indeed, several thermophone structures based on suspended nanowires, graphene sheets, highly porous foams or sponges have been investigated. At the same time, theoretical models have been developed to predict the frequency and power spectra of these devices. However, most of models have taken into consideration a solid homogeneous material for representing the thermophone generating layer, and its microstructure was therefore neglected. If this assumption holds for thin dense materials, it is not acceptable for thick and porous thermophone devices. Hence, a model able to describe the behavior of highly porous foam-or sponge-like generating layers is proposed. It is based on a two temperature scheme since the thermal equilibrium is not typically attained between the foam material and the embedded air. To do this, the fluid equations for the air are coupled with the heat equation for the solid foam through boundary conditions mimicking the energy exchange at the contact surface between them. The behavior of the main physical variables within the porous generating layer is explained and comparisons with recent experimental results are thoroughly discussed.

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Gap separation effect on thermoacoustic wave generation by heated suspended CNT nano-thinfilm

Cited by 26 publications

References 26 publications

Experimental characterization of three-dimensional Graphene’s thermoacoustic response and its theoretical modelling

Experimental characterization of three-dimensional Graphene’s thermoacoustic response and its theoretical modelling

Theory and modeling of cylindrical thermo-acoustic transduction

Two temperature model for thermoacoustic sound generation in thick porous thermophones

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