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Kim, Mirae,Li, Yongzeng,Peng, Di,Yeom, Eunseop,Kim, Kyung Chun Elsevier 2019 Experimental thermal and fluid science Vol.105 No.-
<P><B>Abstract</B></P> <P>When the circular jet impinges onto a cylinder, the three-dimensional (3D) curved wall jet was attached to the wall due to the Coanda effect and the flow separation was delayed with increasing Reynolds number and impinging angle. These interesting phenomena can be studied in depth through a variety of parameters and measurement methods. Time-resolved stereo PIV measurement was conducted to investigate the 3D flow characteristics with instantaneous velocity and vorticity fields. Pressure sensitive paint (PSP) method was used to examine the pressure distribution on the cylinder surface when a circular jet impinges on it. The effects of the impingement angle, Reynolds number, and diameter ratio between the jet nozzle and the cylinder (d/D) were examined at a fixed nozzle to wall distance ratio of two (H/d = 2). Experimental results show that the pressure gradient in the flow direction decreases and the separation is delayed when the Reynolds number and impingement angle are increased at the same distance ratio. As the diameter ratio decreases with the same impingement angle and Reynolds number, the maximum suction pressure increases, and the pressure gradient in the wall jet flow direction increases. The three-dimensional nature of the surface pressure distribution changes with the flow parameters, which are well explained with three-dimensional flow field measurements in the curved 3D wall jet due to the Coanda effect.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Surface pressure distribution was measured when a circular jet impinges on a cylinder. </LI> <LI> Effects of the impingement angle, Reynolds number, and diameter ratio were examined. </LI> <LI> Pressure gradient in flow direction decreases when the impingement angle increases. </LI> <LI> The three-dimensional nature of the surface pressure changes with the flow parameters. </LI> </UL> </P>
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Fangli Qiao,Jian Ma,Yongzeng Yang,Yeli Yuan 한국해양과학기술원 2004 Ocean science journal Vol.39 No.1
Based on the MASNUM wave-current coupled model, the temperature and salinity structures along 36°N in the Yellow Sea are simulated and compared with observations. Both the position and strength of the simulated thermocline are similar to data analysis. The wave-induced mixing is strongest in winter and plays a key role in the formation of the upper mixed layer in spring and summer. Numerical experiments suggest that in the coastal area, wave-induced mixing and tidal mixing control the vertical structure of temperature and salinity.
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Regulating the magnetic anisotropy by Hf thickness and heat treatment in Pt/Co/Hf films
Li Minghua,Zhang Shijie,Wang Shuanghai,Li Yongzeng,Liu Lu,Chen Yu,Shi Hui,Yu Guanghua 한국물리학회 2022 Current Applied Physics Vol.34 No.-
Pt/Co/Hf multilayers were prepared by magnetron sputtering, and the magnetic anisotropy was effectively regulated by Hf thickness and heat treatment in Pt/Co/Hf films. The interface microstructures were characterized. The influence of the interface microstructure on magnetic properties was studied. The results show that the magnetic anisotropy in Pt/Co/Hf films is closely related to the interface microstructure, which is influenced by Hf thickness and the heat treatment temperature. Microstructure analysis shows that after the Pt(3)/Co(1.5)/Hf (1) film is heat-treated, the CoOx content increases, more CoPt(111) forms, the interface is smoother and sharper, and the roughness of the Co/Hf interface decreases. Several factors work together to cause the magnetic anisotropy of the sample to change from in-plane magnetic anisotropy (IMA)to perpendicular magnetic anisotropy (PMA).
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