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RISS 인기검색어
- 검색키워드
- 저자 : Pitchandi K (검색결과 2 건)
- 무료
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- 유료
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T. Mothilal,K. Pitchandi 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10
Present work elaborates the effect of inlet velocity of air and solid particle feed rate on holdup mass and heat transfer characteristics ina cyclone heat exchanger. The RNG k-ɛ turbulence model was adopted for modeling high turbulence flow and Discrete phase model(DPM) to track solid particles in a cyclone heat exchanger by ANSYS FLUENT software. The effect of inlet air velocity (5 to 25 m/s)and inlet solid particle feed rate of (0.2 to 2.5 g/s) at different particle diameter (300 to 500 μm) on holdup mass and heat transfer rate incyclone heat exchanger was studied at air inlet temperature of 473 K. Results show that holdup mass and heat transfer rate increase withincrease in inlet air velocity and inlet solid particle feed rate. Influence of solid particle feed rate on holdup mass has more significance. Experimental setup was built for high efficiency cyclone. Good agreement was found between experimental and simulation pressure drop. Empirical correlation was derived for dimensionless holdup mass and Nusselt number based on CFD data by regression technique. Correlationpredicts dimensional holdup mass with +5% to -8% errors of experimental data and Nusselt number with +9% to -3%.
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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.
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