Numerical Modelling of Flow through Perforated Plates Applied to Electrostatic Precipitator

Swaminatha, M. R.; Mahalakshm, N. V.

doi:10.3923/jas.2010.2426.2432

Cited by 12 publications

(3 citation statements)

References 8 publications

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“…The gas cleaning process also depends on the capture performance of fly ash particles. Usually, the flow is very turbulent; the Reynolds number exceeds the value of Re > 10 5 [6]. The velocity distribution influences turbulence in the vicinity of the collecting electrodes.…”

Section: Introductionmentioning

confidence: 99%

Numerical Prediction of Homogeneity of Gas Flow through Perforated Plates

et al. 2021

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Vanes and baffles are often used as flow distributors where uniform flow is required in the apparatus of large cross-section surface areas. As an alternative, perforated plates with a range of open area ratios are applied to produce required gas flow homogeneity. Usually, the plates with various open area ratios are combined into large panels, of which total surface area can reach hundreds of square meters for large-sized industrial apparatus. Numerical modelling of the flow through such panels can be thought of as overly complex, time-consuming, and inefficient due to numerous small open area ratios in the plates and large differences in dimensions between open area ratios and free-stream areas. For this reason, numerical models of gas flow are limited to single plates only with constant open area ratios. A new indirect modelling approach of gas flow through the perforated plates panel with structural elements and various open area ratios with application of the porous media model is proposed. A perforated plate was experimentally investigated in terms of pressure drop and velocity distribution. The data obtained were used for the validation of the numerical results, which differed from the experimental results by less than 5%. In the next step, numerical analyses were performed for plates with open area ratios in the range of 30 to 70% for gas velocities of 5 and 10 m/s. A general correlation for pressure drop as a function of open area ratio was proposed. Finally, systematic numerical studies of the flow through both perforated and porous plates including structural elements were performed. The internal resistance of the porous core was calculated by means of a developed correlation. A good agreement between results with an error lower than 15% was observed.

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Section: Introductionmentioning

confidence: 99%

Numerical Prediction of Homogeneity of Gas Flow through Perforated Plates

et al. 2021

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“…Therefore, to seek the essence of flow homogenization, exploration should be done from the perspective of fluid mechanics. Take the perforated plate as an example (which is a representative flow distributor in chemical apparatus and a basic element for the study of fluid mechanics), Laws and colleagues 18 reviewed many studies focusing on the perforated plate as a distributor for flow distribution and sum- Many researchers tried to establish the relationship between the resistance and flow uniformity (Guo et al,19,20 Özahi, 21 Bae and Kim, 22 Sahin and Ward-Smith, 23 and Swaminathan and Mahalakshmi 24 ), but most of these results are inaccurate and can only cover a small range of geometrical parameters, because the two effects have no direct relation but are, respectively, determined by the geometries of the perforated plate. Even though Laws mentioned that the two parameters should be independently considered to achieve low cost and better flow uniformity, this problem cannot be resolved by the technology at that time.…”

Section: Introductionmentioning

confidence: 99%

“…Flow resistance is caused by the local resistance of plate and flow deflection is the adjustment of flow field which can promote the flow uniformity under certain conditions. Many researchers tried to establish the relationship between the resistance and flow uniformity (Guo et al, Özahi, Bae and Kim, Sahin and Ward‐Smith, and Swaminathan and Mahalakshmi), but most of these results are inaccurate and can only cover a small range of geometrical parameters, because the two effects have no direct relation but are, respectively, determined by the geometries of the perforated plate. Even though Laws mentioned that the two parameters should be independently considered to achieve low cost and better flow uniformity, this problem cannot be resolved by the technology at that time.…”

Section: Introductionmentioning

confidence: 99%

A CFD‐based design scheme for the perforated distributor with the control of radial flow

2020

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In the present study, flow homogenization by distributors in chemical apparatus is studied as a process of flow control and its mechanism is reconsidered from the model of resistance to the model of radial flow. This process is composed of four consecutive behaviors: the generation, distribution, conversion of the radial flow and the momentum transfer of axial flow. Based on these flow behaviors, the novel distributor is designed as the combination of perforated plate in the center area and vertical guiding baffles around. Taking the wire‐screen catalytic reactor as a case study, numerical simulation is employed to optimize the structure of distributor and a CFD‐based design scheme called “flow field analysis scheme” is proposed. Numerical simulation is conducted in the apparatus with a diffuser (inlet D0 = 500 mm, main part D1 = 3,000 mm) under the gas velocity of 3.6 m/s (corresponding Re ≈ 12,000). The numerical results from optimized distributor show that compared with the traditional perforated plate, the flow field adjusted by the novel distributor can achieve a better flow uniformity with lower energy consumption. The theoretical analysis and numerical results are also validated and proved by the experimental results.

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Multi-scale simulation of the gas flow through electrostatic precipitators

Guo

et al. 2016

Applied Mathematical Modelling

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Numerical Modelling of Flow through Perforated Plates Applied to Electrostatic Precipitator

Cited by 12 publications

References 8 publications

Numerical Prediction of Homogeneity of Gas Flow through Perforated Plates

Numerical Prediction of Homogeneity of Gas Flow through Perforated Plates

A CFD‐based design scheme for the perforated distributor with the control of radial flow

Multi-scale simulation of the gas flow through electrostatic precipitators

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