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알루미늄 평판 및 50 ㎛ 간격 격자 표면에 대한 에탄올 액적 충돌 거동 가시화
강동국,권대희,천두만,염은섭,Kang, Dongkuk,Kwon, Daehee,Chun, Doo-Man,Yeom, Eunseop 한국가시화정보학회 2020 한국가시화정보학회지 Vol.18 No.1
The droplet impact behavior is dominated by some parameters such as surface temperature, We number, surface and fluid property. Especially, Leidenfrost effect which prevents the contact between surface and droplet is very powerful phenomenon for determining droplet impact behavior. Due to this effect, the impact regime is divided into contact boiling regime and film boiling regime whether the droplet contact with the surface. Many studies have found that surface micro-structures which processed by surface processing are effective to overcome the Leidenfrost effect. In this study, droplet impact behaviors were compared using ethanol both on flat and laser-ablated Al surface. On the flat surface, impact regime was mainly divided by surface temperature. And there is key dominant parameter for each regime. On the laser-ablated surface, we could see changed impact regime and different impact behavior such as jetting and ejection of tiny droplets despite of same impact conditions.
강동국(Dongkuk Kang),권대희(Daehee Kwon),염은섭(Eunseop Yeom) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Phenomenon of drop impingement is found in numerous industrial applications, and nature. Most applications of the drop impingement involve high temperatures including fuel drop impingement in internal-combustion engines, water droplet impingement on steam turbine blades and in quenching metal castings and extrusions. The droplet impingement on heated wall can induce different behavior compared to that under room temperature. To see these different behavior, the droplet impingement on aluminum plate with and without heating was captured by using high-speed camera at 5,000 fps. To obtain quantitative information, image processing was applied to raw images. The velocity and size of droplet before the impact were varied due to the hot air flow around the droplet. The maximum spreading diameter after the impact was analyzed. In case of the drop impingement on the hot plate, Leidenfrost phenomenon prevented droplet from reaching the plate. The obtained data were well matched with previous literatures. This image processing progress based on matlab program could be utilized as a tool with advantages in term of easy-to-apply, easy-to-access, and transformations. It will be a great help in visualization and quantitative information analysis of two phase flows.
알루미늄 평판 및 50 μm 간격 격자 표면에 대한 에탄올 액적 충돌 거동 가시화
강동국(Dongkuk Kang),권대희(Daehee Kwon),천두만(Doo-Man Chun),염은섭(Eunseop Yeom) 한국가시화정보학회 2020 한국가시화정보학회지 Vol.18 No.1
The droplet impact behavior is dominated by some parameters such as surface temperature, We number, surface and fluid property. Especially, Leidenfrost effect which prevents the contact between surface and droplet is very powerful phenomenon for determining droplet impact behavior. Due to this effect, the impact regime is divided into contact boiling regime and film boiling regime whether the droplet contact with the surface. Many studies have found that surface micro-structures which processed by surface processing are effective to overcome the Leidenfrost effect. In this study, droplet impact behaviors were compared using ethanol both on flat and laser-ablated Al surface. On the flat surface, impact regime was mainly divided by surface temperature. And there is key dominant parameter for each regime. On the laser-ablated surface, we could see changed impact regime and different impact behavior such as jetting and ejection of tiny droplets despite of same impact conditions.