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RISS 인기검색어
- 검색키워드
- 저자 : Abhay Mohan (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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A Fundamental Study on Droplet Evaporation in Wet Compression Systems
Abhay Mohan,Palani Kumar Chidambaram,Abhilash Suryan,Heuy Dong Kim(김희동) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
For the current investigation, the gas liquid two-phase media are modeled as air involving fine droplet or droplets of water. A cylinder-piston system is modeled which contains air with single or multiple droplets of water. The compression process is achieved by the movement of the piston. During the compression process, thermodynamic properties such as temperature and pressure are investigated in detail. Analytical equations have been derived to obtain the transformation in fluid properties. The results thus obtained are discussed for different conditions of overspray and initial absolute humidity of the air inside the cylinder. The thermodynamic curves obtained are seen to deviate significantly from the dry isentropic curve ( PVγ=constant) with decreasing droplet diameters and increasing mass of droplets. This deviation can be associated with the latent heat absorbed by the evaporating droplets during the process of compression.
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Compression Process of the Moist Air with Water Droplet
Abhay Mohan,Abhilash Suryan,Heuy Dong Kim 한국가시화정보학회 2016 한국가시화정보학회 학술발표대회 논문집 Vol.2016 No.12
A conventional gas turbine system uses more than 60% of the output power to run the compressor in the turbine cycle. Wet compression systems are utilized in conventional gas turbine systems in order to decrease the compressor work and increase the amount of useful work. They work via the evaporation of water droplets sprayed inside the compressor, which in turn reduces the temperature of the working fluid (air). It is known that the temperature of the working fluid is directly proportional to the thermodynamic work. Thus any reduction in the temperature of the air decreases the power requirement of the compressor. Actual wet compression process differs from the conventional single phase compression in view of the latent heat component of the evaporating droplets and therefore cannot be assumed to be isentropic. In this study, the gas-liquid two phase has been modeled as water droplets suspended in air inside a simple cylinder-piston system. The axial movement of the piston achieves the wet compression process. Thermodynamic properties such as temperature and pressure are investigated in detail for different rates of compression of the working fluid. Requisite thermodynamic curves are generated and the deviations of the curves from dry air curves are studied.
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Thermo-fluid dynamic analysis of wet compression process
Abhay Mohan,Palani Kumar Chidambaram,Abhilash Suryan,Heuy Dong Kim 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.12
Wet compression systems increase the useful power output of a gas turbine by reducing the compressor work through the reduction of air temperature inside the compressor. The actual wet compression process differs from the conventional single phase compression process due to the presence of latent heat component being absorbed by the evaporating water droplets. Thus the wet compression process cannot be assumed isentropic. In the current investigation, the gas-liquid two phase has been modeled as air containing dispersed water droplets inside a simple cylinder-piston system. The piston moves in the axial direction inside the cylinder to achieve wet compression. Effects on the thermodynamic properties such as temperature, pressure and relative humidity are investigated in detail for different parameters such as compression speeds and overspray. An analytical model is derived and the requisite thermodynamic curves are generated. The deviations of generated thermodynamic curves from the dry isentropic curves (PV γ = constant) are analyzed.
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S. Zafar Haider,Manindra MOHAN,Abhay K. PANDEY,Pooja SINGH 한국곤충학회 2017 Entomological Research Vol.47 No.5
In this study, repellent and fumigant activities of Tanacetum tomentosum and Ta. dolichophyllum essential oils were investigated against Tribolium castaneum. Results showed that both oils had effective fumigant and repellent activities. Tanacetum tomentosum oil emerged as more potent than Ta. dolichophyllum oil with LC50 values of 6.85 and 4.32 μL/0.25 L air after 24 and 48 h of exposure, respectively. Ta. tomentosum oil also showed more repellent activity than Ta. dolichophyllum oil by exhibiting repellent activity in the range of 38.70–82.35%. Chemical analysis of both oils revealed that β‐bisabolene (50.0%) was the major component of Ta. tomentosum oil and that β‐eudesmol (31.4%) and α‐bisabolol (10.7%) were the major components of Ta. dolichophyllum oil. Doses of 40 and 80 μL/0.5 L air of both oils significantly protected 500 g of wheat grains for up to 6 months from insect infestation, without causing any side effects in the germination rates; the order of germination rates was Ta. tomentosum (89.45%) > Ta. dolichophyllum (86.78%). Thus, this study suggests that essential oils from Ta. tomentosum and Ta. dolichophyllum can be used as potential alternative botanical fumigants for controlling Tr. castaneum.
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