Pressure drop in honeycomb adsorption filters filled with granular activated carbon

The adsorption filters used for cleaning indoor air are often made as a thin honeycomb skeleton filled with granular adsorbents. The resistance of honeycomb adsorption filters is one of the main parts for sizing the blowers. But currently no method is available to predict it accurately. Therefore, the pressure drop of honeycomb adsorption filters with different structures and geometric parameters was experimentally studied. The particles in the adsorption filters had mesh number of 2.5 to 20 and shapes of sphere, column and irregular fragment. The void ratio ranged from 0.293 to 0.919, and the Reynolds number was 13 to 862. The effects of the vertical placement when partially filled were also investigated. According to the measured data, an improved friction factor correlation was obtained. And its prediction accuracy is acceptable for the commonly used honeycomb adsorption filters. (c) 2021 Elsevier B.V. All rights reserved.