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미세자성구슬 움직임에 따른 두 액체 사이의 계면 변화 현상 분석
한규현(Gyuhyeon Han),송륜근(Ryungeun Song),이진기(Jinkee Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
We carried out the experiment investigation for magnetic bead movement while it penetrates the interface of two immiscible fluids (water and oil). During the movement of magnetic bead, the multiple forces are effective; magnetic dipole force, gravitational force, buoyant force, drag force and interfacial force. Here we have imaged the bead penetration of oil/water interface using the high speed camera and analyzed using the force balance and scaling law. The results showed that the four different regime exist during the penetration process 1) approach 2) passing with assisting interfacial force 3) passing with hindering interfacial force and 4) penetration.
Design Pin Fin Sink for the Nature-Inspired Water Collecting from the Air
Gyuhyeon Han(한규현),Cheonji lee(이천지),Sungjong Oh(오선종),Seonju Yeo(여선주),Jinkee Lee(이진기),Hyuneui Lim(임현의) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Up to now, many researchers have reported the water scarcity warning around the world. To overcome this problem, various techniques have been introduced such as purification, water collecting from the air, desalination, etc. Especially, the water collecting techniques from the air are cheap and promising than others due to no limit of sources and locations. In this study, we have designed the nature-inspired pin fin sink arrays for the water collecting from the air and studied several factors to enhance the water collecting efficiencies. We have investigated the water collecting behavior under each condition by tuning the design and surface wettability of the pin fin sink. The number, height, and gap of the pin fin arrays are optimized according to condensation environments. The stable surface wettability enables the increase the water collecting efficiency comparing with a bare pin fin.