• Title/Summary/Keyword: Kinematic Momentum Flux

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Technique for Estimating $CO_2$ and $H_2O$ Exchange between the Atmosphere and the Biosphere : Eddy Covariance Method (광합성과 증발산의 미기상학적 측정기술)

  • Wonsik Kim
    • Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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    • 2003.09a
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    • pp.115-128
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    • 2003
  • o What is the flux \ulcorner Flux is the transfer of a quantity per unit area per unit time. The quantities are mass, heat, moisture, momentum and pollutant in micrometeorology. Kinematic flux (Fluid). The reduction in wind speed due to frictional drag transfers momentum from the atmosphere to the surface, creating turbulence that mixes the air and transports heat and water from the surface into the lower atmosphere. (omitted)

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Simulation of Spray Behaviors by Injection Rate Shapes in Diesel Injection System (분사율 형상에 따른 디젤분사계의 분무거동에 관한 시뮬레이션)

  • Wang, W.K.;Jang, S.H.;Koh, D.K.;Ahn, S.K.
    • Journal of Power System Engineering
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    • v.3 no.3
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    • pp.36-43
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    • 1999
  • Many of thermodynamic-based diesel combustion simulations incorporated a model of fuel spray which attempts to describe how the spray develops according to time. Because the spray geometry is an essential aspect of the fuel-air mixing process, it is necessary to be calculated quantitatively for the purpose of heat release and emission analysis. In this paper, we proposed the calculating method of non-evaporation spray behaviors by injection rate shapes under actual operating conditions of diesel engine. We confirmed the utility of this calculating model as the calculated results were compared with the measured results. This calculating program can be applied usefully to study on the diesel spray behavior.

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