Volume No. 7 Issue No.: 1 Page No.: 146-152 July-September, 2012

 

MIXED FIBROUS FILTER MEDIA FOR SEPARATION OF MOST PENETRATING PARTICLES

 

Das Dipayan*, Pradhan Arun Kumar, Chattopadhyay R.1 and Singh S. N.2

1. Department of Textile Technology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi (INDIA)
2. Department of Applied Mechanics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi (INDIA)

 

Received on : July 05,2012

 

ABSTRACT

 

The quality of human health and well-being can be improved by providing more healthy, comfortable and productive environment. Air quality is one of the prime concerns among many environmental factors as the air is highly polluted today due to presence of numerous contaminants. The size of contaminants present in the air varies from a few micrometers to a few milimeters. The fibrous filter media are known to capture finer to coarser particles effectively, but the higher filtration efficiency is often associated with the higher pressure drop. This ultimately leads to reduction in the quality of the filter media. The mixed fibrous filter media composed of finer and coarser fibres improve the filter quality by optimizing the filtration efficiency and the pressure drop. In this study, a series of virtual three-dimensional mixed fibrous filter media were generated on computer by varying the percentage of finer and coarser fibres in the media. A structure generator based on the three-dimensional voxel model was used. The Stokes flow was computed to determine the permeability and the pressure drop characteristics of the filter media. The Lagrangian formulation of particle transport was used to simulate the filtration efficiency of the filter media at the most penetrating particle size. It was observed that the mixed filter media made from a specific mixing composition of finer and coarser fibres showed the highest quality factor.

 

Keywords : Air filtration, Mixed fibrous media, Simulation, Quality factor, Lagrangian formulation

 

 

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