Plane wave analysis of acoustic wedges using the boundary-condition-transfer algorithm

Kar, T.; Munjal, ML

doi:10.1016/j.apacoust.2005.11.009

Cited by 13 publications

(4 citation statements)

References 13 publications

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“…This idea is inspired by the wide using of a wedged surface material in sound absorption design, in which the sound waves hit a surface without generating any audible sound in an anechoic room. It is reported that the acoustic wedged surface structure can efficiently muffle sound waves of different frequencies [28]. A similar morphology should also be functional in trapping light, although it has rarely been used in this way so far.…”

Section: Enhanced Light Absorbance Using Wedged Surface Tio 2 Nanopormentioning

confidence: 99%

A Highly Efficient Dual Rotating Disks Photocatalytic Fuel Cell with Wedged Surface TiO2 Nanopore Anode and Hemoglobin Film Cathode

Chen

et al. 2016

Catalysts

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In this study, a dual rotating-disk photocatalytic fuel cell using TiO 2 on Ti plate with a wedged surface as the anode and hemoglobin (Hb) on graphite as the cathode was investigated and found to show excellent performance of simultaneous organic pollutant degradation and electricity generation. This study is based on a well-developed photocatalytic fuel cell equipped with dual rotating disks for wastewater treatment that we developed previously, and the innovation of this new device is using a hemoglobin on graphite cathode for in situ hydrogen peroxide (H 2 O 2) generation. The result proved with confidence that H 2 O 2 was generated in situ on a cathode surface with the exited electron transferred from organic oxidation in a photoanodic half cell, and the organic pollutants were removed by the reaction with H 2 O 2 and¨OH in a cathodic half cell. This design uses the invalid excited electron from the photoanode and enhances the overall performance of Rhodamine B degradation compared with the cells using the cathode without Hb. Compared with traditional photocatalytic reactors, the photocatalytic fuel cell developed above shows much better utilization efficiency of incident light and a higher degradation performance of organic pollutants and a larger photocurrent.

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Section: Enhanced Light Absorbance Using Wedged Surface Tio 2 Nanopormentioning

confidence: 99%

A Highly Efficient Dual Rotating Disks Photocatalytic Fuel Cell with Wedged Surface TiO2 Nanopore Anode and Hemoglobin Film Cathode

Chen

et al. 2016

Catalysts

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“…Over the past few decades, a considerable number of studies have been carried out on the performance of single-inlet and -outlet mufflers via different numerical analyses, such as the finite element method (FEM) [1][2][3], the boundary element method (BEM) [4][5][6][7][8] and plane wave theory [9][10][11][12]. The two schemes, FEM and BEM, are widely adopted for acoustic attenuation over the frequency range of interest, including higher-order mode effects.…”

Section: Introductionmentioning

confidence: 99%

“…The transfer matrix method [5][6][7][8][9][10][11][12] is a widely used technique for predicting the performance of mufflers; however, this technique is limited in studying mufflers with single-inlet and -outlet. The modal meshing approach [23][24][25][26], which is based on the concepts of Munjal [27], was adopted by Wu et al for the performance of a cylindrical expansion-chamber muffler with singleinlet and double-outlet, but it encounters difficulty in carrying out the transmission loss of complicated mufflers.…”

Section: Introductionmentioning

confidence: 99%

Application of Fast Multipole Method for Parallel Mufflers

Wu¹,

Wang²

2012

J. mech.

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The purpose of this study is to examine the acoustic performance of parallel simple expansion mufflers by a new approach for an acceleration of computational time required. The fast multipole method separated the field points and source points into two terms by means of addition theorem. When the boundary is divided into uniform meshes, the integration of source element can be calculated fast. Therefore, the fast multipole method, when compared with the boundary element method, reduces CPU time from an order of N 2 to Nlog  N, where N is the number of unknowns and  is a constant. The numerical results have been compared with experiments and analytical approaches based on pressure and velocity continuity, as well as the modal meshing approach; the results clearly show that the agreements are good.

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“…A second unconventional photoelectrode with pyramid surface structure was also fabricated as a comparison. Although the wedge structure covered with different sound absorption materials has been widely used in anechoic chambers and noise control due to the fact that the acoustic wedges can efficiently eliminate the sound wave with different frequency, , it is rarely used in photocatalytic treatment and light absorption. When using the new electrodes, as shown in Figure (b), light is reflected multiple times on the electrode surface and therefore utilized multiple times, resulting in enhanced light utilization efficiency.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Rhodamine B Using an Unconventional graded Photoelectrode with Wedge Structure

et al. 2011

Environ. Sci. Technol.

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A graded TiO(2)/Ti round disk photoelectrode with a wedge structure is proposed, fabricated, and used in a rotating disk photoelectrocatalytic (PEC) reactor for the first time. In addition to improved light utilization efficiency resulting from multiple reflections of radiation light on the wedge surface, enlarged surface area enables the electrode to carry more pollutants for treatment. Compared with the conventional planar electrode with same diameter, the wedge-surface electrode showed much lower light reflectivity (<0.014 versus 0.306), larger photocurrent and better treatment performance. For model dye wastewater containing Rhodamine B (RB) at concentrations ranging from 20 to 150 mg · L(-1), wedge-surface electrode removed 100-79% total color in 60 min and 93-28% COD in 150 min, much higher than 69-28% and 50-4% obtained using the planar electrode under the same experimental conditions. Experimental results demonstrated that the wedge-surface electrode works efficiently and has great potential for treating high concentration dye wastewater.

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Plane wave analysis of acoustic wedges using the boundary-condition-transfer algorithm

Cited by 13 publications

References 13 publications

A Highly Efficient Dual Rotating Disks Photocatalytic Fuel Cell with Wedged Surface TiO2 Nanopore Anode and Hemoglobin Film Cathode

A Highly Efficient Dual Rotating Disks Photocatalytic Fuel Cell with Wedged Surface TiO2 Nanopore Anode and Hemoglobin Film Cathode

Application of Fast Multipole Method for Parallel Mufflers

Degradation of Rhodamine B Using an Unconventional graded Photoelectrode with Wedge Structure

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