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Raghu Palani,Nallusamy Nallusamy,Pitchandi K 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10
The combustion and emission characteristics of inedible oils and their derivatives are quite different from those of mineral diesel; inparticular, inedible oils and their derivatives present higher molecular, relative density, and vaporization characteristics. These propertiesexert great impacts on the fuel spray as well as the interactions of this spray with air in the combustion chamber. Thus, examining spraycharacteristics, including spray cone angle, spray tip penetration, spray area, and fuel atomization, is necessary. The spray characteristicsof fuel mainly depend on the fuel injection pressure, density, viscosity, ambient pressure, and temperature. Among these parameters, fuelinjection pressure significantly affects the spray structure. In this study, experiments were conducted using diesel, jatropha oil methylester, karanja oil methyl ester, and two biodiesel blended fuels (JB20 and KB20)] as fuels in a diesel engine with different injection pressures. Optical techniques for spray visualization and image processing are very efficient tools for analyzing the spray parameters of thetested fuels. Macroscopic spray properties, such as spray tip penetration, spray cone angle, and spray area, were acquired from imagescaptured by a high-speed video camera. The Sauter mean diameter and spray volume of all of the tested fuels were also estimated. Experimentalresults showed that the biodiesel blends demonstrate features different from those of diesel fuel. KB100 presented the highestspray tip penetration and spray area, followed by JB100 JB20, KB20 and diesel. Diesel fuel showed the best spray parameters, followedby JB20, KB20, KB100 and JB100. The tested fuels exhibited better spray characteristics at higher injection pressures than at lower ones.
Antimicrobial Drug Release Scaffolds of Natural and Synthetic Biodegradable Polymers
Prabu, Periasamy,Kim, Kwan-Woo,Dharmaraj, Nallusamy,Park, Jong-Hoon,Khil, Myung-Seob,Kim, Hak-Yong The Polymer Society of Korea 2008 Macromolecular Research Vol.16 No.4
A series of biodegradable polymeric scaffolds was prepared by using a combination of natural (collagen) and synthetic (poly(caprolactone)) (PCL) polymers in various compositions. These scaffolds were soft, spongy, porous and transparent in nature and were characterized by thermogravimetric analysis (TGA) and Fourier transform infrared (FT-IR) spectroscopy. The entrapment efficiency and drug release activity of the scaffolds were analyzed using penicillin and tetracycline as antimicrobial drugs. The drug release activity of the scaffolds with various combinations of collagen and PCL were studied by measuring the optical density in a spectrophotometer at the following time intervals: 1,4, 24, 48 and 60 h. These scaffolds showed better and continuous drug release for up to 60 h. Even after such a long duration, a portion of the drug remained entrapped in the scaffolds, indicating that they can be utilized for wound healing applications.
S. Sridhar,S. Nandhakumar,M. Nallusamy,R. Maguteeswaran 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.4
The glass fiber provides lots of health problem during its production and testing. Our aim is to replace the glass fiber bynatural fiber that will survive for an automotive industry by easily recycling and excellent strength to weight ratio. This workis the investigation of the hybrid composite by reinforcing it with flax, Luffa fiber & sisal fiber. Also in this work, the naturalfibers are treated to remove the impurities and increase the bonding strength and tensile strength. The mechanical andphysical properties for the above hybrid composites are investigated.