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The effect of gravity on self-similarity of Worthington jet after water entry of a two-dimensional wedge

Theoretical & Applied Mechanics Letters 2023年第5期13卷 382-386页

作者： Yan Du Jingzhu Wang Zhiying Wang Yiwei Wang Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Guangdong Aerospace Research Academy Guangzhou 511458China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China

The effect of gravity on the self-similarity of jet shape at late stage of Worthington jet development is investigated by experiment in the *** addition,the particle image velocimetry(PIV)method is introduced to analyze the development of flow *** is a linear scaling regarding the axial velocity of the jet and the scaling coefficient increases with the Froude number.

关键词： Wortington jet Self-similarity jet shape PIV

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Large angle radiation effect on jet measurement in pp collisions at s^(1/2)=7 TeV at the LHC

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Chinese Physics C 2018年第11期42卷 58-62页

作者： Ren-Zhuo Wan Si-Yuan Wang Shuang Li Yi-Ming Feng Feng Liu Fan Yang Dai-Cui Zhou Nano-Optical Material and Storage Device Research Center School of Electronic and Electrical Engineering Wuhan Textile UniversityWuhan 430200China Key Laboratory of Quark and Lepton Physics（MOE）and Institute of Particle Physics Central China Normal UniversityWuhan 430079China College of Science China Three Gorges UniversityYichang 443002China

jet measurement is an ideal probe to explore the properties of the hot dense matter created in ultra- relativistic heavy-ion collisions. Recent results at the LHC show that large angle radiation is non-negligible, but the mechanisms and phenomenology of large angle radiation are still unclear and hotly debated. Considering the coexistence and competition of different physics mechanisms qualitatively, it is assumed that the radiation angle is enhanced randomly over a wide range based on the collinear approximation. Its effects on di-jet momentum imbalance, jet fragmentation function and jet shape are studied in pp collisions at 7 TeV. The results show that di-jet asymmetry is insensitive to large angle radiation, while jet shape and jet fragmentation functions are more sensitive and could explain experimental data well. We conclude that de-collimated radiation cannot be ignored for soft jets, and there is a contribution from large angle radiation （Ф 〉 0.7） of about 8%, which is significant for jet intrinsic structure measurement at PT,jet 〈80 GeV/c.

关键词： quark gluon plasma jet quenching di-jet large angle radiation jet shape

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