표면 처리 기법을 이용해 제작된 평판의 항력 감소

Abstract

The objective of present paper is to reduce drag acting on a flat plate with changing the surface morphology based on the concept of self-cleaning feature of lotus leaf. Main idea is to enhance hydrophobicity of the surface and to reduce surface energy with fabricating nano structures. The level of hydrophobicity was evaluated with the measurement of contact angle. The hydrophobic surface we made decreases the surface energy efficiently enough to have large contact angle. In addition to the hydrophobic surface coating, we changed surface morphology to have nano-scale structure with special surface treatment (patent pending). The modified surface with enhanced hydrophobicity and nano-scale roughness reduces surface energy largely. The hydrodynamic force acting on the plasma-treated surface was measured directly and the drag was reduced 39.9% at maximum.