柔性圆柱体

1, a=radius). The experiments use conventional test methods in conjunction with Stereo Particle Image Velocimetry (SPIV) measurement techniques to evaluate the flow in the boundary region of a small diameter flexible cylinder towed in the high speed towing basin at the Naval Surface Warfare Center Carderock Division (NSWCCD). The flexible cylinders are approximately neutrally buoyant and have an initial length of 152 m and radii of 0.45 mm and 1.25 mm. The first objective for this experiment is to evaluate the streamwise development of wall shear stress (τw) and momentum thickness (θ) in axisymmetric turbulent boundary layers using drag measurements at 3.1, 5.2, 9.3 and 14.4 m/s for comparison to existing data. The second and primary objective for this experiment is to determine the streamwise development of the axisymmetric boundary layer flow and to evaluate relevant boundary layer parameters at 3.8, 7.7, 12.9 and 15.4 m/sec using SPIV images acquired over the entire length of the cylinders. Drag measurements reveal that the wall shear stress is large and that the momentum thickness grows slowly when compared to flat plate boundary layers. The velocity field data shows that the boundary flow remains turbulent over the entire length of the flexible cylinder and that the turbulent profile is different from that of flat plate boundary layers.

The focus of this study is an experimental apparatus thatserves as a model for studying blood flow in a total artificiallung (TAL), a prototype device intended to serve as a bridge tolung transplantation or that supports pulmonary function duringthe treatment of severe respiratory failure. The TAL consistsof hollow cylindrical fibers that oxygen-rich air flowsthrough and oxygen-poor blood flows around. Because gasdiffusivity in the TAL is very small, a convection mechanismdominates the gas transport, which is why we focus on thevelocity around the fibers (modeled as a 0.05-cm-in-diameterand 5-cm-long cylinder). We designed a low-speed watertunnel to study the flow mechanism around the cylinder,across which the flow is generated by a linear actuator thatallows different flow patterns to mimic the flow in a TAL. Wetested the flow in the test section by numerical simulation andby the particle image velocimetry method to study the flowprofile. The results show a uniform flow near the centerline ofthe water tunnel where the cylinder is placed. This decreasesthe effects of free-stream turbulence in the shear layers andreduces the uncertainty in determining the flow patternsaround the cylinder. Knowledge gained from the flow aroundone cylinder (fiber) is beneficial for understanding vortexformation around multiple cylinders. We present a summaryof vortex formation behind a cylinder for Reynolds numbers(Re) of 1, 3, and 5 and Stokes numbers (Ns) of 0.18 to 0.37 results show that higher Re and Ns favor vortex formation.These findings regarding the parameter range for vortex formationmay provide principles for designing artificial lungs toenhance convective mixing. We anticipate that the pulsatileflow circuit presented here can be used to mimic the flow notonly in TALs but in other physiological systems.

漆膜圆柱弯曲试验仪是检测仪器，用于测定色漆和清漆的涂膜柔韧性，是衡量涂料性能的主要指标之一，对于涂料品种的选择。

In order to avoid model support interference, the flow over cylinders of varying fineness ratio (length/diameter) aligned with the free stream were examined using a magnetic suspension and balance system. Thedrag coefficient variation of a right circular cylinder was obtained for a wide range of fineness ratios. ParticleImaging Velocimetry (PIV) was used to examine the flow field, particularly the behavior of the leading-edgeseparation shear layer and its effect on the wake. Reynolds numbers based on the cylinder diameter rangedfrom 5x104 to 1.1x105, while the major portion of the experiment was conducted at the ReD= 1.0x105. For themoderately large fineness ratio, the shear layer reattaches with subsequent growth of the boundary layer,whereas over shorter cylinders, the shear layer remains detached. Differences in the wake recirculation regionand the immediate wake patterns are clarified in terms of both the mean velocity and turbulent flow fields,including longitudinal vortical structures in the cross-flow plane of the wake. The minimum dragcorresponded to the fineness ratio where the separated shear layer reattached at the trailing edge of thecylinder. The base pressure was obtained with a telemetry technique. Pressure fields and aerodynamic forcefluctuations are also discussed.

The wakes of wall mounted circular cylinders of very lowaspect ratio have been investigated in a wind tunnel. Besidesplanar PIV, also high resolution tomographic PIV was usedto capture the flow phenomena downstream of the cylinder.By changing the velocity U￥ and the cylinder height h at aconstant aspect ratio L = h=D, a wide database of differentflow conditions was obtained. The resulting relative height ofthe boundary layer thickness d was 0:6 h=d 2:5, while theReynolds number based on the length l between leading edgeand cylinder centre Rel was 57 000 Rel 188 000. A pair ofcounter-rotating vortices was found in the wake of the cylinder.The rotation sense is such, that in the center of the wake apositive vertical velocity component results. Also horseshoevortices were found next to these trailing vortices. The relativeheight of the incoming boundary layer has a large impact on thedevelopment, strength and dissipation of the vortex system.

Vertical slot fish passes have been applied as a solution to mitigate fish migration problems in running waters, for overtwo decades. They are commonly used to enable target fish to ascend through obstacles in rivers. However, smallspecies are rarely considered in such fishways, of which the performance for small fish still remains unknown. Thisexperiment was to study the turbulence structure in a vertical slot fish pass concerning two different pool length/widthratios of 9 and 6.67 as well as the effect of installing a cylinder behind the slot in affecting the characteristics ofinstationary flow. Cylinders are considered an effective solution to modify the flow structure and to reduce velocity andturbulent energy in order to adapt the flow for the passage of small fish species. Flow visualization and particle imagevelocimetry were used to study the characteristics of mean flow and turbulence and particular emphasis on the unsteadyflow. The results show that flow patterns consist of a water jet and one or two recirculation zones depending on thelength/width ratio of the pool. The direction of the jet was strongly affected by the vertical cylinders. The frequenciesand spatio-temporal evolutions of the main jet beats were analyzed. Combining with the previous studies of fishmigration experiments, the results provide hydraulic evidence on the biological performance.

A survey is conducted to quantitatively visualise the wake flow behind a circular cylinder at Reynolds numbers of 180 to 2500. A time-resolved tomographic PIV method is used to measure thesequence of three-dimensional vector fields evolving in time. The attention is focused upon the unsteady 3D wake organization with the interaction of primary rollers (Karman-Benard) and the secondary vortices resulting from 3D instability of the vortex wake.

很多客户，尤其是纺织化纤、合成树脂等行业，在测量聚合物时，常常会发现用普通实验室粘度计测量时会发生物料爬杆的现象，得不到很好的测量结果。针对这类物料，不能采用同轴圆柱体转子，最简单的方法是采用R/S-CPS 锥板流变仪来进行测量。

混凝土徐变试验仪用于测定混凝土圆柱体或长方体试件在恒定的受压荷载作用下，随时间增长的变形，即混凝土的压缩徐变变形。

Reducing the deleterious effect of Vortex Induced Vibrations (VIV) in marine risers is animportant task for ocean engineers and many competing factors exist in the design ofVIV suppression devices. This thesis explores the experimental minimization of the dragforce and the disruption of v0l1ex formation by utilizing VIV suppression devices.Two series of tests are conducted-both utilizing separate testing designs. The first testsare the flexible cylinder experiments, detailed in Chapter 2, which determine the dragforce and vibration amplitude of numerous, original testing configurations. The secondseries of tests are the rigid cylinder, PIV experiments, detailed in Chapter 3. These testsmeasure both the drag force on the cylinder and the oscillating component of the liftforce, the latter of which is a good indication of v011ex formation. The Chapter 3 testsalso image the test section wake-providing helpful insight into the physical process ofvortex formation.In brief, this thesis presents a detailed description and results of the two series of originalVIV suppression tests. Many original configurations are tested, and the results arecontained herein.

篇文章由山东普创工业科技有限公司为您讲解圆柱形复合罐端盖脱离力测试：圆柱形复合罐端盖脱离力测试标准：GB/T 10440——2008

即使是最小的微粒也会给评价悬浮液和浆体的流动性带来很大的问题。传统的锥/板或同轴圆柱体测量系统并不适合于测量大于几百个微米的结块，因为这些结块易于堵塞狭窄的间隙。Brookfield公司新型的桨式软固体测试仪可以很容易地测量这些传统上难以测量的样品。

本文针对圆柱形锂离子电池整体导热系数测试方法，评论性概述了近些年的文献报道，研究分析了导热系数测试方法的特点，总结了圆柱形锂电池各向异性导热系数测试中存在的问题和面临的挑战，从热分析仪器市场化角度提出了迎接这些挑战的技术途径和新方法。

猪蹄铝塑复合膜包装的柔韧性对阻隔性影响的研究摘要：猪蹄用铝塑复合膜包装柔韧性对猪蹄包装阻隔性起着决定的作用。本文利用Labthink兰光FDT-02揉搓试验仪和VAC-V2压差法气体渗透仪测试猪蹄铝塑复合膜包装揉搓前后氧气透过率变化，并详细介绍了试验的基本过程、原理及试验设备的适用范围、设备参数等内容，企业在选择柔韧性能试验设备及测试方法时可加以参考。关键词：猪蹄、铝塑复合膜、保质期、柔韧性、阻隔性、抗揉搓性、氧气透过率、压差法气体渗透仪了解关于更多相关仪器信息，您可以登陆www.labthink.com查看具体信息或致电0531-85068566咨询。Labthink兰光期待与行业中的企事业单位增进技术交流与合作。

电子电气产品正在往轻量化、小型化、可折叠、便携带等方向发展，例如OLED柔性显示屏技术、可折叠、可穿戴新型电子装备等等。柔性线路板体积小、重量轻、厚度薄，可弯曲的优点，可以满足OLED产品的特点要求，是关键支撑技术之一。柔性线路板上的金属镀层、连接线等的质量，会影响到使用性能。能量色散型X射线荧光分析仪可以检测柔性线路板的金属镀层厚度、镀层构成元素成分，具有分析速度快，分析灵敏度高的优点。

采用LaVision的DaVis 8.0.8图像采集和分析处理软件平台，加上Imager pro HS 4M型相机，构成粒子成像测速（PIV)系统。利用该系统对从一个容器中掉落的圆柱形颗粒的流动分布进行了测量，并与离散元法模型法进行比对，从而优化离散元法模型法

本文特别针对圆柱形锂离子电池的径向导热系数，开展了测试方法研究。在不破坏电池和只有电池圆周外表面的边界条件下，分别采用了恒温和恒流两种测试方法建立了相应的测试模型和解析表达式，并通过有限元仿真来验证了测试模型和解析表达式的准确性，为测试仪器的设计提供了有效指导，为在其他规格锂电池热性能测试中的推广有重大意义。

耐揉搓性是包装材料使用过程中能否保持良好性能的重要影响因素，本文系统的介绍了基于ASTM F392标准测试柔性材料耐揉搓性的试验方法，包括揉搓过程、揉搓模式、验证方法等内容，并总结分析了Labthink兰光利用C681M揉搓试验仪测试包装材料耐揉搓性的试验结果，为柔性材料耐揉搓性的测试及质量控制提供方法及数据参考。

防水卷材低温柔性试验仪是根据中华人民共和国标准GB/T328.14-2007建筑防水卷材试验方法，第14部分：沥青卷材—低温柔性，对低温柔性试验装置的要求。是电动数显低温柔性试验仪的改款升级版，仪器采用不锈钢制作，独特的工艺保证了温度控制精度在 ±1℃，降温速度是普通冰柜的几倍，低温度可达-40℃。

FPC柔性线路板金相切片检测

圆珠笔和笔芯抗泄漏性检测方法与减压仪器介绍摘要：圆珠笔是现在生活以及商务活动中必不可少的一种文具工具，经常会在使用中发现圆珠笔和笔芯的墨水泄漏，不但影响正常使用，更会污染纸张或衣物。本文将结合济南兰光机电技术有限公司的MFY-01密封试验仪，对圆珠笔和笔芯的抗泄漏性能检测进行简单介绍。是笔芯质量的重要指标。关键词：笔芯，泄露，笔芯泄漏，密封试验仪，减压仪

混凝土徐变试验仪用于测定混凝土圆柱体或长方体试件在恒定的受压荷载作用下，随时间增长的变形，即混凝土的压缩徐变变形。适用于混凝土在恒温和绝湿条件下，测试单向受压的混凝土徐变试验。本设备能满足相关行业的科研院所、大专院校的设计、施工、质检等部门混凝土徐变试验的需要。

FPC——柔性印刷线路板。是由柔软的塑胶底膜、铜箔及粘合胶压合而成。具有优的灵活性 和可靠性。FPC按功能分，可分为很多种，如 FPC 天线、FPC触摸屏、FPC 电容屏等，FPC 排 线就是其中的一种，通俗点说，FPC 排线就是连接线。FPC排线的构成 FPC排线因为是 FPC 的 一种，因此，它的构成与 FPC的构成相同,FPC一般是长条形的。

耐揉搓性是包装材料使用过程中能否保持良好性能的重要影响因素，本文系统的介绍了基于ASTM F392标准测试柔性材料耐揉搓性的试验方法，包括揉搓过程、揉搓模式、验证方法等内容，并总结分析了Labthink兰光利用FDT-02揉搓试验仪测试包装材料耐揉搓性的试验结果，为柔性材料耐揉搓性的测试及质量控制提供方法及数据参考。

真空饱水率试验仪设备满足GB/T 17794-2008《柔性泡沫橡塑热制品》标准的要求，以上标准抽真空的要求自行设计生产的，真空压力，保持时间可以自行设置， 自动计时，自动断电，操作灵活，能耗低、噪音小、且安装方便，操作简单，安全性能高等优点。用于建筑材料技术领域，循环使用无气水，提高检测精度。

建立了法庭科学中蓝色圆珠笔色痕的激光剥蚀电感耦合等离子体质谱鉴别方法.对95种不同来源的蓝色圆珠笔进行了分析!依据所含金属元素种类的差别将,95种圆珠笔分为34类,其中26类圆珠笔根据元素种类的差别可直接区分!其余8类依据元素间响应值之比进行区分!对字痕载体纸张的考察结果表明了纸张对检测结果无影响.实验结果表明方法重现性良好!精密度10%,与传统分析技术相比!本方法可获得更好的鉴别结果,95种蓝色圆珠笔中有88种可使用该方法有效鉴别.该方法简便快速"精密度良好"对样本宏观无损!适合法庭科学对蓝色圆珠笔鉴定的需要.

整套系统的土壤传感器分为4种，共计144只，分别是TDR土壤水分、温度、电导率三参数传感器，土壤水势传感器，土壤温度传感器，以及土壤溶液自动取样系统。在安装之前，我们对所有的传感器进行了可靠性测试，已确保安装进柱体的传感器具有很好的一致性。

近年来，柔性表面增强拉曼(SERS)基底受到极大关注，尤其面对表面污染残留物的检测，可直接擦拭检测，且无损或极小损伤。目前常用的有纸基、玻璃纤维、棉织布等，制备方法主要是将贵金属纳米粒子组装在柔性基质表面。然而由于贵金属粒子裸露在表面，缺乏必要的保护，擦拭检测后贵金属粒子易受到损害，仅一次性使用，难于重复使用，难于满足一些特殊的、恶劣环境（如抗超声破坏、强酸碱介质、高温低温环境）的应用需求。?

R1 在光辐射调控中的应用。基于柔性量子点薄膜表面的介电微球腔阵列，分别利用介电微球腔的 WGM 效应和定向天线效应，调控了量子点的内量子效率和外量子效率，成功地将定向辐射角度控制在 9° 范围，实现量子点薄膜荧光性能 3 个数量级的提高。这为具有高效、柔性、全色、可穿戴特点的新一代量子点发光及显示器件，奠定了一定的研发基础。

电子产品在我们生活中扮演着重要的角色。我们每天使用的手机、数码相机、汽车和电脑中都存在柔性电路板。现在的FPC基本都使用聚酰亚胺或聚酯薄膜为基材。聚酰亚胺材料具有非易燃性，几何尺寸稳定，具有较高的抗拉强度，并且具有承受焊接温度的能力，是几乎所有芯片的首选材料。