导读:本文包含了流体阻力论文开题报告文献综述及选题提纲参考文献，主要关键词:水中舞台机械,流体力学,绕流阻力,理论分析
流体阻力论文文献综述
戴志荣[1]（2019）在《水中舞台机械的流体阻力分析与计算》一文中研究指出应用流体力学原理对水中舞台机械的运动阻力进行理论分析,建立数学计算模型;借鉴相关研究成果及实验数据对计算结果进行修正,使理论计算尽可能与实际模型相符,并通过算例举证说明。(本文来源于《演艺科技》期刊2019年10期）
郭婷,蔡旺锋,辛峰,王燕[2]（2019）在《叁维微观孔隙模型中流体阻力的评估》一文中研究指出通过叁维微观孔隙模型来评估碳纤维多孔介质中流体对材料结构和流体黏度的依赖性,并使用Python语言开发了一种新的多孔介质孔隙和骨架的分离方法。通过模拟发现,孔隙率对黏性阻力和惯性阻力起决定性的作用;黏度对惯性阻力的影响比对黏性阻力的影响大。(本文来源于《现代化工》期刊2019年11期）
仝志永,刘金标[3]（2019）在《水下浮筒平台流体阻力试验研究》一文中研究指出为研究水下浮筒平台在河道内受到的流体阻力,设计了水下浮筒平台模型流体受力水池试验,研究了不同流线体外型随河道流速变化的阻力系数和升力系数,为浮筒平台结构设计和水下平台外型设计提供了参考。(本文来源于《科技创新与应用》期刊2019年16期）
张亮,原亚东,孙志强,李徐佳,陈贺敏[4]（2019）在《通道形状对活塞冷却油腔内工作流体阻力及流动特性的影响》一文中研究指出为揭示通道形状对活塞冷却油腔内工作流体的阻力及流动特性的影响,将冷却油腔的直壁通道改为波壁通道,并采用压力差和可视化的方法对通道内工作流体的阻力及流动特性展开了实验研究。压力差实验结果表明,与水在直壁通道内的流动相比,水在波壁通道内层湍转捩点大大提前,将非牛顿流体替换水作为工作流体后,层湍转捩点再次提前;可视化实验结果表明,波壁通道内工作流体在雷诺数较低时就可呈现不稳定流动形态。为在较低雷诺数下继续强化活塞冷却油腔内的热质传递,进一步开展了脉动流场下非牛顿流体在波壁通道内的流动特性实验和数值模拟研究,结果表明:脉动流场的操作参数对波壁通道内非牛顿流体的流动不稳定率有较大影响,且影响了通道内非牛顿流体的质量传递。(本文来源于《中国机械工程》期刊2019年11期）
于海鹏,徐让书,钟超,刘春鹏[5]（2018）在《流体阻力系数迭代过程中连续性分析与处理》一文中研究指出根据尼古拉兹实验曲线以及对应的阻力系数经验公式计算阻力系数时,为保证阻力系数与传热方程迭代过程的连续性,对过渡区和湍流过渡区提出了新的阻力系数计算经验公式以及过渡区传热系数计算经验公式,新的阻力系数经验公式在雷诺数从小到大范围内连续,使传热方程与其迭代过程易于收敛。新的阻力系数经验公式计算结果与已知判据进行了验证,过渡区相对误差在5%以内,湍流过渡区相对误差在10%以内,满足工程计算要求,计算结果更为准确。(本文来源于《科学技术与工程》期刊2018年10期）
杨璋,蒋彦龙,王合旭,孙程斌[6]（2017）在《大型板式换热器流体阻力特性试验研究》一文中研究指出测试大型液-液无相变人字板式换热器不同板型、不同板片数样机的流体阻力性能,研究准则方程式法计算换热器压降与实测压降的关系。利用大型流体阻力测试装置搭建试验台,根据国标要求测试板片数分别为7片和99片,板型分别为高效-高效型、低效-低效型、高效-低效型时样机的流体阻力特性,结果显示样机板型不变板片数增多时,压降随流量增大而增加;样机板片数不变仅板型不同时,压降比基本稳定。实测某国产大型混装人字板式换热器不同流量下的压降,并与不同样机所得欧拉-雷诺准则方程计算的理论压降进行比较,发现样机板片数为7片时偏差大且不稳定;样机板片数为99片时,偏差小且稳定。偏差来源于板片间流速的不均匀分布,样机板片数与产品实际板片数相差太多时,不适于用雷诺-欧拉准则方法计算理论压降。(本文来源于《电站系统工程》期刊2017年02期）
张鑫鑫,彭枧明,杨冬冬,吴冬宇,孙强[7]（2016）在《冲锤处流体阻力对高能射流式液动锤性能影响》一文中研究指出应用计算流体动力学(computational fluid dynamics,简称CFD)动态分析技术,对SC-86H型高能射流式液动锤试验样机流场特性进行了研究,计算得出了相关性能参数,并通过实验装置对液动锤不同输入流量下的冲击频率进行了测试。将液动锤冲击频率的模拟计算结果与实测结果进行了对比,结果表明:若不考虑冲锤处流体阻力的影响,液动锤冲击频率计算值与实测值相比明显偏大,最小相对误差达18.9%;而将冲锤处流体阻力的作用考虑在内,冲击频率的计算值与实测值比较接近,最大相对误差为8.0%,大幅提高了数值计算结果与实测值之间的吻合程度。这说明冲锤高速运动产生的轴向流体阻力不容忽略,设法减小冲锤处流体阻力的大小,有望成为提高高能射流式液动锤冲击功和能量利用率的重要途径。(本文来源于《振动.测试与诊断》期刊2016年05期）
龙彪,龙伟[8]（2016）在《突缩截面的流体阻力数值模拟及优化》一文中研究指出流体流通截面面积缩小是引起局部阻力的一种常见形式,常用渐变管来减小其阻力。针对一种小型热解处理设备,在流道截面缩小比例较大和轴向距离受限的情况下,建立叁维数值计算模型,分析了不同结构参数对于局部阻力的具体影响。运用流体仿真软件,选用标准k-ε湍流模型,求解器采用高阶求解模式。计算得出内部流场的速度分布情况和局部全压降,对比分析出口圆角半径和直线渐缩管轴向距离对局部阻力系数的影响,为工程设计提供有益参考。(本文来源于《机械》期刊2016年05期）
徐洋,梅继仲,史科芬[9]（2015）在《流体阻力型健身器材的应用研究》一文中研究指出针对市面上弹簧类或重物类运动器材的不足之处,根据流体运动学和动力学的基本原理,研究流体流动阻力结构在人体运动健身器材上的应用可行性。介绍了流体运动阻力型运动器材的结构原理和特点,给出了流体阻力型运动器材的计算方法和机构设计的基本方案。(本文来源于《科技视界》期刊2015年28期）
Ahmad,Khurshid[10]（2015）在《基于AFM的流体阻力测量和相关影响因素分析》一文中研究指出Micro/nanofluidics is one of the recently developing fields of science, engineering and technology. Because of the high surface to volume ratios, the flow on micro/nanoscale can be strongly affected by the interfacial properties and the associated phenomena. Brief knowledge of liquid drag, hydrodynamic boundary conditions as well as characterization of surfaces and interfaces are key factors to the design of effective and efficient micro/nano fluid transport systems. In this pursuit, numerous research efforts have been made and interesting phenomena, including, boundary slip, gaseous layers and nanobubbles etc have been reported. These phenomena have been identified to be affecting the hydrodynamic drag at the solid liquid interface.Atomic force microscopy has been proven to be an excellent state of the art technique for the study and characterization of surfaces and interfaces. It can be used for acquiring direct as well as indirect information of the phenomena occurring at solid liquid interface. This technique can give the information of the interface properties and the associated phenomena on precisely small scale i.e. sub nanometer. However, several studies have debated its use for the measurement of boundary slip. Factors, like virtual deflection, shape of the AFM force cantilever and stiffness of the cantilever, have been proposed to be affecting the interpretation of the boundary slip.The factors affecting the measurement of slip provide an excellent scope for further study. Similarly, the relation of the slip with wettability, the mutual disagreement of the studies on the magnitude of slip on smooth hydrophobic surfaces and deviation from the theoretical prediction of slip on such surfaces are the problems that worth further investigation. Moreover, the slip on rough surfaces with different wetting characteristics, use of magnetic field to control the drag at the solid liquid interface and characterize the spherical domains formed on the hydrophobic thin polymers films are of interest to the subject field.In this study, a detailed analysis of the factors affecting the measurement and interpretation of hydrodynamic drag at solid liquid interface was conducted with the help of atomic force microscopy(AFM). This study firstly reports the analysis of the slip on smooth hydrophilic surfaces. Different types of cantilevers, with varying shape and stiffness were used to study its effect on the measurement of boundary slip. Various shear rates were used in order to study the effect of shear rate on the boundary slip. It was found that the drag on the cantilever is an important factor which can affect the interpretation of the boundary slip. The results showed that the drag on the cantilever increases in a direct fashion with an increase in the drive velocity. Neglecting the drag on the cantilever can make a reasonable explanation to the shear rate dependent slip. Moreover, no evidence was found to support that the slip can be affected by shape of the cantilever or the applied shear rate.Afterward, the slip on smooth hydrophobic surfaces was also studied. Hydrophobic surfaces were prepared with greatest possible care. Slippage of water as well as electrolytic solutions on these surfaces was studied with the help of different shaped colloidal probes. The effect of shear rate upon the slip on smooth hydrophobic surfaces was also studied. The slip results showed that the no-slip condition is applicable to the smooth hydrophobic surfaces. The results of this study were precisely close to the theoretical studies. Furthermore, it was found that the no-slip condition on smooth hydrophobic surfaces deviates to apparent slip in the case of the presence of contaminates on the probe or the surface.Moreover, the hydrodynamic flow over rough hydrophilic and hydrophobic surfaces was also studied. The study revealed that the effect of surface roughness on slip is dominated over the effect of hydrophobicity. The magnitude of the slip on the rough hydrophilic and the hydrophobic was in minimal difference. The small difference in the values suggested that the main factor, which causes a slip like behavior on the rough hydrophobic surfaces is the roughness and not the hydrophobicity. Furthermore, the hydrodynamic flow analysis on heterogeneously rough surfaces suggested that the nanoasperities give rise to a local slip behavior. In the presence of the nanoasperities, the slip become highly local and varies according the topographic features of the surface.This study also reports the analysis of the effect of magnetic field(range B≤0.6T) on the slippage of water and electrolytes over hydrophilic and hydrophobic surfaces. The feasibility of magnetic treatment of liquid for controlling the boundary slip and hydrodynamic drag at solid liquid interface was analyzed with the help of AFM. The hydrodynamic and electrostatic force data was analyzed, carefully. However, the analysis did not produce any clear evidence to support that the magnetic treatment of water and electrolytic solutions,(B≤0.6T), can result persistent and detectable change in the hydrodynamic dynamic boundary conditions as well as the hydrodynamic viscous drag. The results further showed that the viscosity of water remains unaltered after the magnetic treatment. Furthermore, the electrostatic force measurements revealed that the surface charge did not change in considerable manner. This suggested that there was no significant change in the electrical conductivity and the hydrogen bonding.Additionally, the formation of spherical domains, on the hydrophobic polystyrene(PS) thin film spin casted on silicon substrate, was briefly characterized with the help of AFM. The results showed that the spherical domains on the PS thin film have some characteristics identical to that of micro/nanobubbles, including, sphericity, smaller contact angle(measured from the inside on the spherical domain), lower line tension, phase contrast as well as the coalescence phenomenon. However, the insensitivity to the contact force/lateral force, absence of the long range hydrophobic attraction force and the presence of contaminant like objects and scratches on these domains suggested that these domains are most likely blisters. Furthermore, the analysis of the PS film before and after the contact with water suggested that the film stretches, deforms and bulges after being exposed to water. A reasonable explanation to the nucleation of these spherical domains can be the permeation of the water into to the PS film-silicon interface. The penetration of water, into the PS film-silicon interface, through osmosis or defects present on the film causes detachment of the film from the substrate and thus the film stretches and bulges out, thus producing micrometric sized blisters.(本文来源于《哈尔滨工业大学》期刊2015-10-01）
流体阻力论文开题报告
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流体阻力论文参考文献
[1].戴志荣.水中舞台机械的流体阻力分析与计算[J].演艺科技.2019
[2].郭婷,蔡旺锋,辛峰,王燕.叁维微观孔隙模型中流体阻力的评估[J].现代化工.2019
[3].仝志永,刘金标.水下浮筒平台流体阻力试验研究[J].科技创新与应用.2019
[4].张亮,原亚东,孙志强,李徐佳,陈贺敏.通道形状对活塞冷却油腔内工作流体阻力及流动特性的影响[J].中国机械工程.2019
[5].于海鹏,徐让书,钟超,刘春鹏.流体阻力系数迭代过程中连续性分析与处理[J].科学技术与工程.2018
[6].杨璋,蒋彦龙,王合旭,孙程斌.大型板式换热器流体阻力特性试验研究[J].电站系统工程.2017
[7].张鑫鑫,彭枧明,杨冬冬,吴冬宇,孙强.冲锤处流体阻力对高能射流式液动锤性能影响[J].振动.测试与诊断.2016
[8].龙彪,龙伟.突缩截面的流体阻力数值模拟及优化[J].机械.2016
[9].徐洋,梅继仲,史科芬.流体阻力型健身器材的应用研究[J].科技视界.2015
[10].Ahmad,Khurshid.基于AFM的流体阻力测量和相关影响因素分析[D].哈尔滨工业大学.2015