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Atomization mechanism of a charged viscoelastic liquid sheet

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Chinese Journal of Aeronautics 2015年第2期28卷 403-409页

作者： Liu Lujia Liu Yingjie Lu Lipeng School of Astronautics Beihang University School of Energy and Power Engineering Beihang University

In order to study atomization mechanism of a viscoelastic liquid sheet in an electric field, the spatial-temporal stability analysis of a viscoelastic liquid sheet injected into a dielectric station- ary ambient gas in the presence of a vertical electric field is conducted. The dispersion relations of both sinuous and varicose disturbance modes are solved to explore the spatial-temporal instability of a charged viscoelastic sheet, by setting both the wave number and frequency complex. A para- metric study is performed to test the influence of the dimensionless parameters on the absolute instability of the sheet. The results show that the increase of liquid Weber number and time constant ratio, or decrease of gas to liquid density ratio and Reynolds number, can damp the absolute insta- bility. The effect of the liquid elasticity depends on the value of time constant ratio： when time con- stant ratio is small, the increase of liquid elasticity could amplify absolute growth rate, but the effect is weak when the elasticity number is relatively large; when time constant ratio is large, the increase of liquid elasticity cannot affect the absolute growth rate. Moreover, the variation of electrical Euler number can hardly influence the absolute instability of a charged viscoelastic sheet.

关键词： absolute growth rate absolute instability Electrified sheet Spatial-temporal instability Viscoelastic liquid

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THE SPATIO-TEMPORAL STRUCTURE OF BINARY FLUID CONVECTION WITH HORIZONTAL FLOW

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Journal of Hydrodynamics 2004年第2期16卷 151-157页

作者： NINGLi-zhong YOSHIFUMIHarada HIDEOYahata LIJian-zhong InstituteofWaterResourcesandHydroelectricEngineering Xi＇anUniversityofTechnologyXi＇an710048China DepartmentofAppliedPhysics FacultyofEngineeringFukuiUniversityBunkyo3-9-11Fukui910Japan DepartmentofMaterialsScience FacultyofScienceHiroshimaUniversityHigashi-Hiroshima739Japan InstituteofWaterResourcesandHydroelectricEngineering Xi＇anUniversityofTechnologyXi＇an710048China

The convection structure in a rectangular channel with a horizontal flow forΓ = 12 was studied. The simulations were preformed by solving the hydrodynamic equations using theSIMPLE method. The convective behavior in an absolutely and convectively unstable regime wasstudied. The results show that the two types of convection patterns in this system appear dependingon the convection intensity and horizontal flow. A periodically localized traveling wave state wasfound in this system.

关键词： convection horizontal flow localized traveling wave absolute instability convective instability

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The absolute and Convective Secondary Instabilities in the Conduction Regime

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Communications in Nonlinear Science and Numerical Simulation 1999年第1期4卷 34-38页

作者： Jianjun TAO and Dachun YAN (Dept. of Mechanics & Engineering Sciences,Peking University, Beijing 100871, China) Dept. of Mechanics & Engineering Sciences Peking University Beijing 100871 China

Convective and absolute instabilities in the conduction regime of a vertical heated slot are investigated. It is found that in a large range of Prandtl number (0 12, a secondary instability appears with stationary mo... 详细信息

Convective and absolute instabilities in the conduction regime of a vertical heated slot are investigated. It is found that in a large range of Prandtl number (0 instability mode has different characteristics: the stationary mode is absolute instability while the traveling wave mode is convective instability. When Pr > 12, a secondary instability appears with stationary mode, and it is proven that even at large Prandtl numbers the stationary mode still exists.

关键词： absolute instability convective instability conduction regime

Control of Karman Vortex Street behind a Thin Airfoil at Low Reynolds Number

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Journal of Flow Control, Measurement & Visualization 2016年第3期4卷 114-123页

作者： Shohei Takagi Yasufumi Konishi Shigeru Obayashi Masato Asai Department of Aerospace Engineering Tokyo Metropolitan University Tokyo Japan Institute of Flow Science Tohoku University Sendai Japan

To control the Karman vortex street formed behind a thin airfoil at a certain incidence, a control cylinder was placed at the suction side apart from the airfoil in the downstream region. Both smoke visualization and hot-wire measurements confirmed that the Karman vortex street was completely suppressed. The mechanism for suppression of the vortex street was examined with a hot-wire survey.

关键词： Karman Vortex Street Vortex Suppresion absolute instability Convective instability