• Journal of Power System Engineering
• /
• v.5 no.1
• /
• pp.64-72
• /
• 2001

According to the regulation of IMO, oil discharge from ships is allowed under 15ppm only and an oil filtering equipment is essential. However, for large ships using heavy fuel oil of over S.G 0.98 and viscosity 380cSt and system oil, it has been in difficulty to process with existing filtering type of oily water separator. A parallel plate type oily water separator which is one of gravity type separators can be used as an assistant equipment for the oil filtering system to meet the present IMO standard of 15 ppm, because it is an efficient method in dealing with a large amount of rich oil with high specific gravity. This work is focused on the fundamental investigation of the performance of the plate type oily water separator by visualization method and PIV(Particle Image Velocimetry) measurement to acquire multi-point velocity data simultaneously. The experimental results showed that the space of the plates acts a significant role in separating process and it was found that an important point to minimize a vortex flow is to flow a large amount of fluid in space of the plates in order to promote the efficiency of separation.

• Composites Research
• /
• v.32 no.5
• /
• pp.222-228
• /
• 2019

The proton exchange membrane fuel cell (PEMFC) system has many potential uses as an environmentally friendly power source. Carbon fiber composite bipolar plates are highly corrosion resistant and have high specific strength and stiffness in acidic environments, however, the relatively low electrical conductivity is a major issue which reduces the efficiency of PEMFC. In this study, electrically conductive particles (graphite powder and carbon black) are applied to carbon-epoxy composite prepregs to reduce the electrical resistance of the bipolar plates. The electrical resistance and mechanical properties are measured using conventional test methods, and a unit cell performance evaluation of developed carbon composite bipolar plates is performed to compare with the conventional bipolar plate.

• Korean Journal of Food Science and Technology
• /
• v.21 no.4
• /
• pp.528-535
• /
• 1989

Starches isolated from Seipoong and Daeji potato were classified into small and large granules. The starch granule size for Seipoong and Daeji was in the range of $10-85\;{\mu}m$ and $13-90\;{\mu}m$, respectively. Seipoong starch contained more large granules $(>41\;{\mu}m)$ while Daeji starch had more small granules $(<30\;{\mu}m)$. There was no difference in water-binding capacity both between two starches and among granule sizes. Amylose content for toro starches was the same but was higher in large starch granules than small ones. Swelling powder at $80^{\circ}C$ for parent starches was essentially the same but small starch granules had much higher swelling powder than large ones. The large starch granules for Daeji showed higher peak viscosity by amylograph than small starch granules. No such difference was observed for Seipoong starch. The gelatinization temperature range of small starch granules was wider than that of large ones, but gelatinization enthalpy was the same between large and small starch granules. The starches regardless granule sizes were completely gelatinized at $70^{\circ}C$.

• Journal of the Korean Electrochemical Society
• /
• v.20 no.3
• /
• pp.49-54
• /
• 2017

We develop a ceramic composite separator prepared by coating $ZrO_2$ nanoparticles with a poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) copolymer on a polyvinyl alcohol (PVA) mechanical support prepared by electrospinning technique to improve thermal properties. The gurley number of the ceramic composite separator shows much lower value than that of a PE separator even though it possesses the polymeric coating layer with ceramic nanoparticles. In addition, the proposed sample shows higher electrolyte uptake than PE separator, leading to enhancing the ionic conductivity of the proposed sample and, by extension, the rate discharge properties of lithium ion batteries. Thermal stability of the ceramic composite separator is dramatically improved without any degradation in electrochemical performance compared to the performance of conventional PE separators.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2002.05a
• /
• pp.44-44
• /
• 2002

• 한국생물공학회:학술대회논문집
• /
• 2000.04a
• /
• pp.446-448
• /
• 2000

In this study, we investigated the theoretical and experimental study for separation of solid-liquid suspensions of water and fine particles using acoustic standing wave. When the acoutic force was not applied, the separation efficiency was decreased as flow rate was increased. When it was applied, the separation efficiency was maintained over 95%.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2013.05a
• /
• pp.585-586
• /
• 2013

• Journal of the Korean Ceramic Society
• /
• v.15 no.3
• /
• pp.127-134
• /
• 1978

탄도충격에 의하여 파괴된 단결정 alumina의 파면조직을 광학 및 투과 전자현미경으로 연구 분석하였다. 파면의 주된 파괴 양상은 결정 입개면의 분리 또는 결정입내 파괴로 구성되어 있고 이러한 파괴과정은 복잡한 cleavage 양상과 결정입자 내에서의 소성변형을 수반하고 있다. 미세조직 관찰 결과에 의하면 alumina ceramics의 충격 파괴과정에서 에너지의 흡수가 국부적인 소성변형으로 나타나고 있음을 알 수 있었다.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2009.06a
• /
• pp.881-882
• /
• 2009

• Proceedings of the Membrane Society of Korea Conference
• /
• 2008.05a
• /
• pp.141-144
• /
• 2008