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Investigation on Eccentric Agitation in the Stirred Vessel Using 3D-laser doppler velocimeter

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Chinese Journal of Chemical Engineering 2006年第5期14卷 618-625页

作者：王波张捷宇贺友多安胜利 Material and Metallurgical School Inner Mongolia University of Science & Technology School of Materials Science and Engineering Shanghai University

The spatial structure of the velocity field in a stirred vessel with water has been measured and analyzed using the laser doppler velocimeter technique, with the immersing depth and agitation speed of the impeller re-maining approximately constant. The experimental results were provided such as the mean velocity field, fluctuat-ing velocities, turbulent kinetic energy, Reynolds shear stress and time series of the velocity in the stirred tank. These results probably provided the valuable basis to further optimize and enlarge the stirred tank in the industrial process.

关键词： stirred vessel laser doppler velocimeter eccentric agitation mean velocity

Determination of relationship between Rayleigh waves velocity and stress with laser doppler velocimeter

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Determination of relationship between Rayleigh waves velocit...

USING laser ULTRASONICS FOR NONDESTRUCTIVE RESIDUAL STRESS EVALUATION

实验力学国际会议

作者： Shoichi Kobayashi Depatment of Construction Eng. Fukui Univ. of Tech. Fukui 910-8505 Japan

＜正＞ A non-contact measurement technique of Rayleigh wave velocity is proposed. In the non-contact measurement system, a laser doppler velocimeter is used to detect wave motions. With above technique, the relationship between Rayleigh wave velocity and stress for an aluminum alloy 5052 and steel SS400 is determined, and the results are in good agreement with that obtained by contact measurement method.

关键词： Rayleigh wave velocity laser doppler velocimeter stress-acoustic coefficient sing-around method non- contact measurement.

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Acta Mechanica Sinica 2002年第2期18卷 188-192页

作者：贺玲凤 College of Traffic & Communications South China University of TechnologyGuangzhou 510640China

A non-contact measuring technique of ultrasonic waves velocity isproposed,in which Rayleigh waves are detected by a laser doppler velocimeter andthe velocity is measured precisely by means of a sing-around unit and a digital *** the proposed technique,the acoustoelastic coefficient of Rayleighwaves in mild steel SS41 is obtained,which is in good agreement with that obtainedby the contact *** the non-contact technique is applied to evaluatethe residual stress in a butt-welded steel plate,the result is reasonable.

关键词： non-contact nondestructive test acoustoelasticity residual stress Rayleigh waves laser doppler velocimeter

Effect of Catch Cup Geometry on 3D Boundary Layer Flow over the Wafer Surface in a Spin Coating

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Journal of Thermal Science 2008年第1期17卷 56-60页

作者： Mizue MUNEKATA Seiichi KIMURA Hiroaki KURISHIMA Jinsuke TANAKA Sohei YAMAMOTO Hiroyuki YOSHIKAWA Kazuyoshi MATSUZAKI Hideki OHBA Department of Mechanical System Engineering 2-39-1 KurokamiKumamoto860-8555 Japan Assistant Professor Graduate School of Science and Technology Kumamoto University2-39-1 KurokamiKumamoto860-8555 Japan Tokyo Electron Kyushu LTD. 1-1 FukuharaKoushi-shiKumamoto861-1116 Japan Department of Mechanical System Engineering 2-39-1 KurokamiKumamoto860-8555 Japan Tokyo Electron LTD. 650 MitsuzawaHosaka-choNirasaki-shiYamanashi407-0192 Japan

Recently, development of high technology has been required for the formation of thin uniform film in manufacturing processes of semiconductor as the semiconductor instruments become more sophisticated. Spin coating is usually used for spreading photoresist on a wafer surface. However, since rotating speed of the disk is very high in spin coating, the dropped photoresist scarers outward and reattaches on the film surface. A catch cup is set up outside the wafer in spin coating, and scattered photoresist mist is removed from the wafer edge by the exhaust flow generated at the gap between the wafer edge and the catch cup. In the dry process of a spin coating, it is a serious concern that the film thickness increases near the wafer edge in the case of low rotating speed. The purpose of this study is to make clear the effect of the catch cup geometry on the 3D boundary layer flow over the wafer surface and the drying rate of liquid film.

关键词： Rotating disk Spin coating Boundary layer flow laser doppler velocimeter Infrared camera

Experimental and numerical study on the flapping motion of submerged turbulent plane jet

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Science China(Technological Sciences) 2013年第10期56卷 2391-2397页

作者： SUN JianHong ZHAO LiQing HSU ChinTsau College of Aerospace Engineering Nanjing University of Aeronautics & Astronautics Department of Mechanical Engineering Hong Kong University of Science & Technology

A submerged,vertical turbulent plane water jet impinging onto a free surface will be self-excited into a flapping oscillation when the jet velocity,leaving the jet orifice,exceeds a critical *** flapping phenomenon was verified simultaneously in this paper by laser doppler velocimeter measurement and numerical analyses with volume of fluid approach coupled with a large eddy simulation turbulent *** general agreement of mean velocities between numerical predictions and experimental results in self-similar region is good for two cases:Reynolds numbers 2090 and 2970,which correspond to the stable impinging jet and flapping *** show that the flapping jet is a new flow pattern for submerged turbulent plane jets with characteristic flapping frequency,and that the decay of the mean velocity along the jet centerline is considerably faster than that of the stable impinging state.

关键词： turbulent plane jet flapping motion laser doppler velocimeter volume of fluid large eddy simulation

TURBULENT SEPARATED REATTACHED FLOW IN A TWO-DIMENSIONAL CURVED-WALL DIFFUSER

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Acta Mechanica Sinica 1993年第2期9卷 117-123页

作者：尹军飞余少志 Department of Power Engineering Nanjing Aeronautical InstituteNanjing 210016 China

A turbulent separation-rcattachment flow in a two-dimensional asymmetrical curved-wall diffuser is studied by a two-dimensional laser doppler *** turbulent boundary layer separates on the lower curved wall under strong pressure gradient and then reattaches on a parallel *** the inlet of the diffuser,Reynolds number based on the diffuser height is 1.2×10~5 and the velocity is 25.2m/*** re- sults of experiments are presented and analyzed in new defined streamline-aligned *** experiment shows that after Transitory Detachment Reynolds shear stress is negative in the near-wall backflow region. Their characteristics are approximately the same as in simple turbulent shear layers near the maximum Reynolds shear stress.A scale is formed using the maximum Reynolds shear *** is found that a Reynolds shear stress similarity exists from separation to reattachment and the Schofield-Perry velocity law ex- ists in the forward shear *** profiles are used in the experimental work that leads to the design of a new eddy-viscosity *** length scale is taken from that developed by Schofield and *** composite velocity scale is formed by the maximum Reynolds shear stress and the Schofield Perry velocity scale as well as the edge velocity of the boundary *** results of these experiments are presented in this paper

关键词： separating flow boundary layer turbulent flow turbulence model laser doppler velocimeter two- dimensional diffuser