Evaluation of Adhesion Characteristics under High-temperature Based on the Force Balance Between Fluid Resistance and Adhesion

Abstract

New evaluation method of particle adhesion characteristics based on fluid penetration method has been proposed. We presumed that the pressure drop of airflow in a particle bed is equivalent to the stress on the particles induced by the airflow passing through the void in the particle bed. It was also assumed that the particle bed collapses when the stress is equal to the strength of the particle bed expressed by Rumpf equation. Based on these assumptions, we defined the adhesion characteristic value as a ratio of adhesive force to particle surface area. It was confirmed that the adhesive characteristic values measured for spherical Silica particles having different sizes were equivalent to the theoretical values of van der Waals force. The fact implies that the proposed method can be applied to the evaluation of the adhesion characteristics.