Investigation on media pack configurations for air filtration devices

Khaw, Ji Wei (2020) Investigation on media pack configurations for air filtration devices. Final Year Project, UTAR.

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Abstract

The increasing need for clean air has highlighted the importance of air filtration devices in improving air quality. Generally, resistance is produced when air is moved through an air filter media which contains large density of fibres. In air filtration system, one of the performance parameters is indicated by the amount of pressure drop across the filter media. Thus, this study aims to investigate the influence of media pack configuration on the performance of air filtration device. In this study, the filter media was made into pleated model by using Solidworks, while the fluid flow was simulated on a commercially available filter media by using Ansys Fluent software. The filter media was treated as a porous medium throughout the entire study. To ensure that minimum pressure drop is attained, the effects of pleat shape, pleat distance, and pleat height on the filter media were examined. It was found that when the flat sheet filter media was made into pleated shape, the pressure drop was reduced due to increased filtration area. However, pressure drop would rise with viscous drag effect when pleat space became too narrow that the contraction and expansion of flow was significant. The typical U-shaped curve generated in the results is in strong agreement with the findings of Chen, Pui and Liu (1995). Therefore, this implies that the minimum pressure drop is attained when trade-off between the effects of filtration area and viscous drag on media is achieved by the optimal interaction between pleat distance and pleat height.

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