Abstract
Biomimetics allows one to mimic nature to develop materials and devices of commercialinterest for engineers. Drag reduction in fluid flow is one of the examples found in nature.In this study, nano, micro, and hierarchical structures found in lotus plant surfaces, as wellas shark skin replica and a rib patterned surface to simulate shark skin structure werefabricated. Drag reduction efficiency studies on the surfaces were systematically carried outusing water flow. An experimental flow channel was used to measure the pressure drop inlaminar and turbulent flows, and the trends were explained in terms of the measured andpredicted values by using fluid dynamics models. The slip length for various surfaces inlaminar flow was also investigated based on the measured pressure drop. Forcomparison, the pressure drop for various surfaces was also measured using airflow.
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