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조서현(Seohyun Cho),심창휘(Chang-Hwi Sim),김성진(Seong Jin Kim),정석(Seok Chung),문명운(Myoung-Woon Moon) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Adhesion skimmer is widely used in diverse environmental and industrial fields, such as oil spill clean-up and primary treatment of industrial oily wastewater. The adhesion skimmer works by allowing oils to adhere to the oleophilic surface of a rotating drum, belt, or disk on the water surface. However, the adhesion-based mechanism is ineffective for collecting highly viscous oils, such as low-sulfur fuel oil (LSFO) that is increasingly being used under the IMO 2020 regulation, because they tend to slide off the skimmer surface by forming thick heavy clumps rather than an oil film. In the present work, we provide a hydrophilic ratchet skimmer that collects oil by scooping it rather than relying on the previous adhesion mechanism. The scooped oil then can be completely detached from the hydrophilic ratchet, without using an additional scraper, by inducing a capillary impulse on the ratchet tip, which prevents an oil fouling on the skimmer surface. The hydrophilic ratchet skimmer is found to produce a higher oil recovery rate than the traditional adhesion-type skimmer regardless of oil viscosity.