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Analysis of the Hydraulic Performances of a New Liquid Emitter Based on a Leaf Vein Concept

Fluid Dynamics & Materials Processing 2023年第8期19卷 2147-2160页

作者： Tianyu Xu Zhouming Su Yanru Su Zonglei Li Quanjie Chen Shuteng Zhi Ennan Zheng Kaili Meng School of Hydraulic and Electric Power Heilongjiang UniversityHarbin150080China

The leaf-vein drip irrigation emitter is a new type of drip emitter based on a bionic structure able to support shunting,sharp turns,and increased *** the present work,the results of twenty-five tests executed in the framework of an orthogonal design strategy are presented in order to clarify the influence of the geometrical parameters of the flow channel on the hydraulic characteristics of such *** corresponding flow index and head loss coefficient are determined through numerical simulations and model *** results show that the flow index of the flow channel is 0.4970∼0.5461,which corresponds to good hydraulic *** head loss coefficient of the flow channel is 572.74∼3933.05,which in turn indicates a good energy dissipation *** order of influence of the leaf vein flow channel parameters on the flow index can be represented in a synthetic way as a>b>c>d>e,where(a)is the width of the inlet,(b)is the horizontal distance of the front water inlet,(c)is the vertical distance of the inner edge of the front end,(d)is the horizontal distance of the rear water outlet and(e)is the vertical distance of the outer edge of the front *** flow index increases with d,decreases with a,first decreases,and then increases with b,and first increases and then decreases with the increase of c and *** coefficient(R^(2))of the fitted model related to geometric parameters and flow index is *** relative errors among experimental testing,simulation calculation and predictive estimates are shown to be less than 5%.

关键词： Leaf vein flow channel geometrical parameters flow index energy dissipation

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Simulation of the Hydraulic Behavior of a Bionic-Structure Drip Irrigation Emitter

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Fluid Dynamics & Materials Processing 2022年第4期18卷 1169-1182页

作者： Tianyu Xu Yanru Su Zhouming Su Shuteng Zhi Ennan Zheng Chengcheng Yan School of Hydraulic and Electric Power Heilongjiang UniversityHarbin150080China School of Traditional Chinese Medicine Zhejiang Pharmaceutical CollegeNingbo315503China

The bionic structure drip irrigation emitter(BSDE)is a new-type emitter,by which better hydraulic performances can be *** the present work,twenty-five sets of orthogonal test schemes were implemented to analyze the influence of the geometric parameters of the flow channel on the hydraulic characteristics and energy dissipation efficiency of this *** numerical simulations and verification tests,the flow index and energy dissipation coefficient were *** to the results,the flow index of the BSDE is *** energy dissipation coefficient under the pressure head of 5-15 m is *** verification test has shown that the relative errors among measured values,simulated values and estimated values are less than 3%,which indicates that the flow index can be estimated reliably.

关键词： BSDE flow index energy dissipation numerical simulation verification test

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Reproducibility of Perfusion Parameters of Optic Disc and Macula in Rhesus Monkeys by Optical Coherence Tomography Angiography

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Chinese Medical Journal 2016年第9期129卷 1087-1090页

作者： Jing Li Yi-Quan Yang Di-Ya Yang Xiang-Xiang Liu Yun-Xiao Sun Shi-Fei Wei Ning-LiWang Beijing Tongren Eye Center Beijing Tongren Hospital Capital Medical University Beijing Ophthalmology and Visual Sciences Key Laboratory Beijing 100730 China Beijing Institute of Ophthalmology Beijing Tongren Hospitai Capital Medical University Beijing 100005 China

Background： Optical coherence tomography （OCT） angiography is a novel technique by which we can detect the local perfusion of fundus directly. The aim of this study was to evaluate the reproducibility of optic disc and macular flow perfusion parameters in rhesus monkeys using OCT angiography. Methods： Eighteen healthy monkeys （18 eyes） were subjected to optic disc and macula flow index measurements via a high-speed and high-resolution spectral-domain OCT XR Avanti with a split-spectrum amplitude de-correlation angiography algorithm. Right eye was imaged 3 times during the first examination and once during each of the two following examinations. The intra-visit and inter-visit intraclass correlation coefficients （ICCs） were both determined. Results： The average flow indices of the four optic disc area layers were 0.171 ± 0.009 （optic nerve head）, 0.015 ± 0.004 （vitreous）, 0.052 ±0.009 （radial peripapillary capillary）, and 0.167 ± 0.011 （choroid）. Average flow indices of the four macula area layers were 0,044 ± 0.011 （superficial retina）, 0.036 ± 0.011 （deep retina）, 0.016 ± 0.009 （outer retina）, and 0.155 ± 0.013 （choroid）. Intra-visit （1CC value： 0.821-0.954） and inter-visit （ICC value： 0.844±0.899） repeatability were both high. Conclusions： The study is about the reproducibility of optic disc and macular perfusion parameters as measured by OCT angiography in healthy rhesus monkeys. flow index measurement reproducibility is high for both the optic disc and macula of normal monkey eyes. OCT angiography might be a useful technique to assess changes when examining monkeys with experimental ocular diseases.

关键词： flow index Macula Optic Disc Optical Coherence Tomography Angiography

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