다공성 재료의 표면에 연속 충돌하는 액적의 크기 및 속도가 재료 내부 침투에 미치는 영향

Abstract

In the present study, effects of drop size and impinging velocity on penetration into a porous medium were experimentally investigated. Melamine foam with 99 % of porosity and 7.568 × 10⁻¹⁰㎡ of permeability was used as porous medium. The range of impinging velocity and drop size were 0.74 - 1.36 ㎧ and 1.9 - 3.0 ㎜, respectively. Penetration velocity was increased as drop size became smaller while little affected by the impinging velocity. As maximum surface wetted area became smaller, penetration velocity increased and ratio between diameter of the surface wetted area and drop diameter approached 4 regardless of drop size.