The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Rolf Karlsson - One of the best experts on this subject based on the ideXlab platform.
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Proceedings of Turbine-99 - Workshop 2 : The second ERCOFTAC Workshop on Draft Tube Flow, Älvkarleby, Sweden, June 18-20 2001
2016Co-Authors: T. Fredrik Engström, Håkan Gustavsson, Rolf KarlssonAbstract:Proceedings of Turbine-99 - Workshop 2 : The second ERCOFTAC Workshop on Draft Tube Flow, Alvkarleby, Sweden, June 18-20 2001
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Proceedings of Turbine-99 : workshop on draft Tube Flow
2016Co-Authors: Rikard Gebart, Håkan Gustavsson, Rolf KarlssonAbstract:The Turbine 99 workshop, held in Porjus, Sweden, 20-23 June 1999, was organized to determine the state-of-the-art of CFD simulations of draft Tube Flows. A total of 16 groups accepted the invitatio ...
Liu Jia - One of the best experts on this subject based on the ideXlab platform.
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The Development and Application of Small Tube Flow Irrigation
Agricultural Science&Technology and Equipment, 2009Co-Authors: Liu JiaAbstract:The small Tube Flow irrigation is a kind of modern saving water irrigation methods. This paper introduces thoroughly the characters of the small Tube Flow irrigation. It has many good characters, such as water-saving, strong anti-blockage capability, energy-saving, irrigation uniform and strong adaptability. Moreover, it summarizes the application status、research development and application of the small Tube Flow irrigation. The analysis shows that the method of the small Tube Flow irrigation is easy to do and can be accepted by many users, its operation cost is low and it has realized water-saving. Meanwhile, it has increased agricultural level of science and technology.
Jyh-shyan Lin - One of the best experts on this subject based on the ideXlab platform.
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Thermophoretic particle deposition efficiency in turbulent Tube Flow
Journal of The Chinese Institute of Chemical Engineers, 2008Co-Authors: Jyh-shyan Lin, Chuen-jinn Tsai, Kuo-lun Tung, Hann-chyuan ChiangAbstract:Abstract This study investigated the thermophoretic particle deposition efficiency numerically. The critical trajectory was used to calculate thermophoretic particle deposition in turbulent Tube Flow. The numerical results obtained in turbulent Flow regime in this study were validated by particle deposition efficiency measurements with monodisperse particles (particle diameter ranges from 0.038 to 0.498 μm) in a Tube (1.18 m long, 0.43 cm i.d., stainless-steel Tube). The theoretical predictions are found to fit the experimental data of Tsai et al. [Tsai, C. J., J. S. Lin, S. G. Aggarwal, and D. R. Chen, “Thermophoretic Deposition of Particles in Laminar and Turbulent Tube Flows,” Aerosol Sci. Technol. , 38 , 131 (2004)] very well in turbulent Flows. In addition, an empirical expression has been developed to predict the thermophoretic deposition efficiency in turbulent Tube Flow.
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Short communication Thermophoretic particle deposition efficiency in turbulent Tube Flow
2008Co-Authors: Jyh-shyan Lin, Chuen-jinn Tsai, Kuo-lun Tung, Hann-chyuan ChiangAbstract:This study investigated the thermophoretic particle deposition efficiency numerically. The critical trajectory was used to calculate thermophoretic particle deposition in turbulent Tube Flow. The numerical results obtained in turbulent Flow regime in this study were validated by particle deposition efficiency measurements with monodisperse particles (particle diameter ranges from 0.038 to 0.498 mm) in a Tube (1.18 m long, 0.43 cm i.d., stainless-steel Tube). The theoretical predictions are found to fit the experimental data of Tsai et al. [Tsai, C. J., J. S. Lin, S. G. Aggarwal,andD.R.Chen,‘‘ThermophoreticDepositionofParticlesinLaminarandTurbulentTubeFlows,’’AerosolSci.Technol.,38,131(2004)] very well in turbulent Flows. In addition, an empirical expression has been developed to predict the thermophoretic deposition efficiency in turbulent Tube Flow. # 2008 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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Suppression of particle deposition in Tube Flow by thermophoresis
Journal of Aerosol Science, 2004Co-Authors: Jyh-shyan Lin, Chuen-tinn Tsai, Cheng Ping ChangAbstract:Suppression of particle deposition from Flow through a Tube with circular cross-section was investigated numerically and experimentally for the case when the wall temperature exceeds that of the gas. Particle transport equations for convection, diffusion and thermophoresis were solved numerically to obtain particle concentration profiles and deposition efficiencies. The numerical results were validated by particle deposition efficiency measurements with monodisperse particles. For all particle sizes, the particle deposition efficiency was found to decrease with increasing Tube wall temperature and gas Flow rate. Particle deposition was suppressed completely when the Tube wall was heated to a certain temperature slightly above that of the gas Flow. An empirical expression has been developed to predict the dimensionless temperature difference needed for zero deposition efficiency in a laminar Tube Flow for a given dimensionless deposition parameter.
Hann-chyuan Chiang - One of the best experts on this subject based on the ideXlab platform.
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Thermophoretic particle deposition efficiency in turbulent Tube Flow
Journal of The Chinese Institute of Chemical Engineers, 2008Co-Authors: Jyh-shyan Lin, Chuen-jinn Tsai, Kuo-lun Tung, Hann-chyuan ChiangAbstract:Abstract This study investigated the thermophoretic particle deposition efficiency numerically. The critical trajectory was used to calculate thermophoretic particle deposition in turbulent Tube Flow. The numerical results obtained in turbulent Flow regime in this study were validated by particle deposition efficiency measurements with monodisperse particles (particle diameter ranges from 0.038 to 0.498 μm) in a Tube (1.18 m long, 0.43 cm i.d., stainless-steel Tube). The theoretical predictions are found to fit the experimental data of Tsai et al. [Tsai, C. J., J. S. Lin, S. G. Aggarwal, and D. R. Chen, “Thermophoretic Deposition of Particles in Laminar and Turbulent Tube Flows,” Aerosol Sci. Technol. , 38 , 131 (2004)] very well in turbulent Flows. In addition, an empirical expression has been developed to predict the thermophoretic deposition efficiency in turbulent Tube Flow.
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Short communication Thermophoretic particle deposition efficiency in turbulent Tube Flow
2008Co-Authors: Jyh-shyan Lin, Chuen-jinn Tsai, Kuo-lun Tung, Hann-chyuan ChiangAbstract:This study investigated the thermophoretic particle deposition efficiency numerically. The critical trajectory was used to calculate thermophoretic particle deposition in turbulent Tube Flow. The numerical results obtained in turbulent Flow regime in this study were validated by particle deposition efficiency measurements with monodisperse particles (particle diameter ranges from 0.038 to 0.498 mm) in a Tube (1.18 m long, 0.43 cm i.d., stainless-steel Tube). The theoretical predictions are found to fit the experimental data of Tsai et al. [Tsai, C. J., J. S. Lin, S. G. Aggarwal,andD.R.Chen,‘‘ThermophoreticDepositionofParticlesinLaminarandTurbulentTubeFlows,’’AerosolSci.Technol.,38,131(2004)] very well in turbulent Flows. In addition, an empirical expression has been developed to predict the thermophoretic deposition efficiency in turbulent Tube Flow. # 2008 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
Andreas Ibrom - One of the best experts on this subject based on the ideXlab platform.
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attenuation of concentration fluctuations of water vapor and other trace gases in turbulent Tube Flow
Atmospheric Chemistry and Physics, 2008Co-Authors: W J Massman, Andreas IbromAbstract:Recent studies with closed-path eddy covariance (EC) systems have indicated that the attenuation of fluctuations of water vapor concentration is dependent upon ambient relative humidity, presumably due to sorption/desorption of water molecules at the interior surface of the Tube. Previous studies of EC-related Tube attenuation effects have either not considered this issue at all or have only examined it superficially. Nonetheless, the attenuation of water vapor fluctuations is clearly much greater than might be expected from a passive tracer in turbulent Tube Flow. This study reexamines the turbulent Tube Flow issue for both passive and sorbing tracers with the intent of developing a physically-based semi-empirical model that describes the attenuation associated with water vapor fluctuations. Toward this end, we develop a new model of Tube Flow dynamics (radial profiles of the turbulent diffusivity and Tube airstream velocity). We compare our new passive-tracer formulation with previous formulations in a systematic and unified way in order to assess how sensitive the passive-tracer results depend on fundamental modeling assumptions. We extend the passive tracer model to the vapor sorption/desorption case by formulating the model's wall boundary condition in terms of a physically-based semi-empirical model of the sorption/desorption vapor fluxes. Finally we synthesize all modeling and observational results into a single analytical expression that captures the effects of the mean ambient humidity and Tube Flow (Reynolds number) on Tube attenuation.
