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A study of a nano-sized water droplet’s transition from a flat surface to a pillared surface
매튜스탠리암브로시아 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.2
The ability to control the hydrophobicity of a surface is of importance to many industries. The dynamic behavior of nano-sized water droplets moving from a flat surface to a pillared surface using molecular dynamics simulations was investigated. Simulations were carried out in two steps. In the first computational step, the initial group of water molecules reached equilibrium on a flat graphite surface. In the second computational step, a constant force was applied to the water droplet and the motion of the water droplet was evaluated as it moved from the flat surface to the pillar-type surface. The movement of the water droplet could be grouped into three different categories and depended on the pillar height and the magnitude of the applied force. The results showed the strongest body force with a pillar height of 6 graphite layers allowed most of the water molecules to move along the top of the pillars. In conclusion, a strong force and pillar height approximately half of the droplet height displayed the best transition from a flat surface to a pillared surface.
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Wind Turbine Placement Optimization at the Catholic University of Pusan Using 3-D Drone Mapping
매튜스탠리암브로시아 한국환경과학회 2021 한국환경과학회지 Vol.30 No.1
To reduce pollution, decrease the production of carbon dioxide, and to maintain a secure supply of energy, interest continues to grow in the area of renewable energy especially since there is a finite supply of cheap oil. Wind energy is one of the most viable options to consider and supply part of the energy needed to reduce dependence on foreign oil. However, it is difficult to predict the wind speed in an environment with many obstacles such as buildings and trees and getting accurate dimensions of those obstacles is difficult particularly on sloped mountainous terrain. In this study a drone was used to create a 3-D map of the campus of the Catholic University of Pusan. The dimensions and elevations for the 3-D map were used to make a model of the school campus in the CFD program Envi-met. Simulations were run for five different wind directions and 4 different elevations to find the location that would give the highest electrical output for a wind turbine. When considering all of these variables it was found that the optimal location was above the Student Union which had a 40% higher wind speed and could produce 274% more electrical power than the original wind speed.
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Dynamic hydrophobicity of heterogeneous pillared surfaces at the nano-scale
권태우,매튜스탠리암브로시아,장준경,하만영 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
In this study, the static and dynamic behaviors of nano-scale water droplets on heterogeneous surfaces were investigated using moleculardynamics simulations. The surface consisted of a flat plate and pillar structures. The surface was designed with four pillar heights andthree pillar characteristic energies. Simulations were first run so that the water droplet reached the static equilibrium state. Once the staticwater droplets were in Cassie-Baxter state, increasing the pillar height had very little effect on the contact angle. Droplets on the surfacewith the strongest pillar characteristic energy never reached the Cassie-Baxter state and contact angles tended to decrease with increasingpillar height. Then five forces were applied to the water droplets parallel to the surface to observe the dynamic behavior of the droplets. Then, the effect of the pillar characteristic energy on the behavior of the dynamic water droplet was discussed using the contact anglehysteresis ( cosqRe - cosqAd ) as the pillar height and the magnitude of the applied force varied. When compared to the homogeneouscases, it was found that except at the lowest pillar height all of the lower pillar characteristic energy cases were hydrophobic and did notdepend much on pillar height or magnitude of force. Whereas the higher pillar characteristic energy cases were generally hydrophilic andthe hydrophobicity depended greatly on the magnitude of the force.
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유민정,매튜스탠리암브로시아,권태우,장준경,하만영 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.4
A numerical study was carried out using a molecular dynamics program to examine the wetting characteristics of nano-sized water droplets on surfaces with various pillar surface fractions under different conditions. Square-shaped pillars had surface fractions that increased from 11.1 % to 69.4 %. The pillars had 4 different heights and 3 different surface energies. When the pillar surface fraction changed, the contact angle of a water droplet also changed due to the attraction between the droplet and the pillar surface or the inner attraction of the water molecules. The pillar height also has different effects on the water droplet depending on the magnitude of surface energy.
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Study of the wetting characteristics of water droplet on a heterogeneous pillared surface
고정안,권태우,매튜스탠리암브로시아,하만영 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.3
We investigated the wetting characteristics of a water droplet on a heterogeneous pillared surface at the nano-scale including contactangle, molecule inflow percentage and density fields and compared them with the wetting characteristics of a water droplet on a homogeneouspillared surface. Molecular dynamics simulations were employed to analyze the wetting behavior of water droplets on surfaceswith pillar structures by considering different potential energies including bond, angle, Lennard-Jones and Coulomb to calculate the interactingforces between water molecules and the surface. The heterogeneous surfaces considered had pillars with a different surfaceenergy than the base surface. It was found that the difference in surface energy between the base surface and pillar had little effect on thehydrophobicity of the surface at low pillar heights. However cases with pillar heights over H = 4.24 Å, the pillar surface energy has alarger effect on the molecule inflow percentage with the maximum differences in the range from 33.8% to 47.2% depending on the basesurface energy. At a pillar height of H = 16.96 Å, the pillar surface energy has a large effect on the contact angle of the water droplet withthe maximum differences in the range from -26.1% to -40.62% depending on the base surface energy. There was a large variation in thecontact angle of the droplet as the pillar height increased when there was a large difference in the surface energies between the base andthe pillars.
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