Spherical Bubble(球形气泡)研究综述
Spherical Bubble 球形气泡 - Neutron noise measurements for estimating void velocity in a void-containing water flow where spherical bubbles move upward are simulated using a continuous energy Monte Carlo method. [1] First, a spherical bubble that collapses and rebounds without the effects of gravity is computed to verify the accuracy of the model. [2] We consider the problem of the propagation of high-intensity acoustic waves in a bubble layer consisting of spherical bubbles of identical size with a uniform distribution. [3] The spectrum of such nanoscale thermal oscillations of the bubble surface presents several resonance peaks and reveals that the contact line of the hemispherical bubble is pinned on the substrate. [4] Gas-liquid mass transfer from spherical bubbles is studied by DNS for various Reynolds numbers ( 1 ⩽ Re ⩽ 300 ), Schmidt numbers ( 1 ⩽ Sc ⩽ 500 ) and bubble surface contamination degrees ( 0 ° ⩽ θ cap ⩽ 180 ° ). [5] For a spherical bubble, the direct numerical integration of Young-Laplace works very well in computing the bubble shape. [6] To gain insights into clustering mechanisms, we study the interaction of a pair of spherical bubbles rising in a vertical channel through combined experiments and modelling. [7] First, the trailing bubble decreases the drag coefficient relative to the case of a spherical bubble as a result of the increased vorticity generated at the leading bubble surface by its deformation. [8] We explore, by experiments and theoretical analysis, the morphological phase space of a filament confined to the surface of a spherical bubble. [9] For a spherical bubble, the entrapment condition depends on the balance between the buoyancy force and the force exerted by the yield stress of the viscoplastic material. [10] Their resonance frequency is well approximated by the formula for spherical bubbles with the same volume. [11] Bubble diameter distribution functions such as the Nukiyama-Tanasawa, Weibull, and lognormal distributions are validated with the chord length data of spherical bubbles where the Nukiyama-Tanasawa distribution appears to fit the chord length data the best. [12] The size distributions of the He platelets and spherical bubbles were evaluated as function of temperature and dose. [13] To validate the EMIS method, we compare microstreaming patterns generated by bubbles excited at four different values of resonance frequencies using a high-speed imaging setup: 1) fr,B, the theoretical fr assuming a spherical bubble, 2) fr,Beq, the theoretical fr based on the concept of an “equivalent spherical bubble” having a surface area equal to the vibrating air-water interface area, 3) fr,Pf, the EMIS-based fr of a piezoelectric transducer, and 4) fr,Cf, the EMIS-based fr of the microfluidic chip bonded with the transducer. [14] Both faceted and spherical bubbles are observed in all the three alloys, but the edges of the faceted bubbles have different preferential orientations: mostly in TiVTa, mostly in the V-alloy, and co-appearance in TiVNbTa. [15] It is investigated in detail on the influence of interfacial contamination degrees (described with the cap angle θ) on hydrodynamic characteristics of the spherical bubble when the bubble Reynolds number (Re) is larger than 200. [16] We experimentally observe and theoretically analyse oscillations of a spherical bubble in a gelatin gel under ultrasound irradiation to quantify viscoelastic effects on the nonlinear bubble dynamics. [17] Their surprising long-term stability remains controversial due to the widespread assumption that spherical bubbles cannot achieve stable equilibrium. [18] The motion of the spherical bubble in an aqueous solution of n-propanol and sodium dodecyl sulphate (SDS) was monitored by a high-speed camera. [19] Surprisingly, the theory also quantitatively accounts for the nontrivial dynamics observed in simulations of a model soap foam characterized by creation and destruction of spherical bubbles, which suggests that the two nonequilibrium systems belong to the same universality class. [20] The spherical bubbles consisting of OH-vacancy complexes grow by absorbing OH monomers and coalescing with other bubbles under annealing conditions. [21] In this paper, we present the study of the bevaiour of spherical bubble in N-dimensions fluid. [22] On the other hand, the Rayleigh Plesset ordinary differential equation was used to explain this phenomenon under spherical bubbles hypothesis. [23] In this work, a facile and scalable method to generate nonspherical bubbles with long-term stability is proposed. [24] Here, we develop a quasi-one-dimensional model of a seismic air gun coupled to a spherical bubble that accounts for gas dynamics and spatially variable depressurization inside the firing chamber in order to investigate controls on the initial peak of the source signature. [25] A fully resolved simulation is performed on the motion of spherical bubbles in homogeneous turbulence subject to a vertical flow that is uniformly sheared in a horizontal direction in order to understand the effect of turbulence on the transverse migration of rising bubbles. [26] We investigate the dynamics of the bubble collapse, which is qualitatively similar to the collapse of a spherical bubble. [27] The sum of gas and vapour partial pressures inside a spherical bubble (Pbub) of radius r exceeds the ambient barometric pressure (Pamb) and is given by the Young-LaPlace equation: Pbub = Pamb + 2γ/r for a bubble not in contact with a solid surface. [28] In the bubble model, spherical and non-spherical bubbles at random positions, sizes and shapes were produced by Monte Carlo method. [29] It was assumed that, in the accordance with known observations, cavities appear as spherical bubbles in the cores of vortices near the slot corners. [30] The results obtained for spherical bubbles are in agreement with predictions of Legendre et al. [31] The high extent of MMT intercalation and exfoliation may have enabled the formation of relatively uniform and spherical bubbles, mechanically strong films, and a viscoelastic continuous phase, all of which may have helped to stabilize bubbles against various destabilization mechanisms. [32] The equation of the dynamics of spherical bubbles was first derived and used by Rayleigh (1917) and then Plesset (1949). [33] In order to clarify the effect of bubble radius on submerged laser peening capacity, the fluid/material two-way coupled numerical analysis of a hemispherical bubble on the wall surface with changing the bubble radius was performed. [34] The limiting cases of a spherical bubble and soap film are considered. [35] The primary Bjerknes force acting on a spherical bubble is calculated by considering the translation simultaneously. [36] The petal-like shape is qualitatively described through the captured images, while the non-spherical bubbles are analyzed by the aspect ratio. [37]使用连续能量蒙特卡罗方法模拟用于估计球形气泡向上移动的含空隙水流中的空隙速度的中子噪声测量。 [1] 首先，计算一个在没有重力影响的情况下坍塌和反弹的球形气泡，以验证模型的准确性。 [2] 我们考虑高强度声波在由大小相同且分布均匀的球形气泡组成的气泡层中传播的问题。 [3] 气泡表面的这种纳米级热振荡的光谱呈现出几个共振峰，并揭示了半球形气泡的接触线固定在基板上。 [4] 通过 DNS 研究了球形气泡的气液传质，适用于各种雷诺数 ( 1 ⩽ Re ⩽ 300 )、施密特数 ( 1 ⩽ Sc ⩽ 500 ) 和气泡表面污染度 ( 0° ⩽ θ cap ⩽ 180° )。 [5] 对于球形气泡，Young-Laplace 的直接数值积分在计算气泡形状方面效果很好。 [6] 为了深入了解聚类机制，我们通过组合实验和建模研究了一对在垂直通道中上升的球形气泡的相互作用。 [7] 首先，尾随气泡相对于球形气泡的情况降低了阻力系数，这是由于其变形在前导气泡表面产生的涡量增加的结果。 [8] 我们通过实验和理论分析探索了限制在球形气泡表面的细丝的形态相空间。 [9] 对于球形气泡，截留条件取决于浮力和粘塑性材料屈服应力所施加的力之间的平衡。 [10] 它们的共振频率可以通过具有相同体积的球形气泡的公式很好地近似。 [11] 气泡直径分布函数（例如 Nukiyama-Tanasawa、Weibull 和对数正态分布）使用球形气泡的弦长数据进行验证，其中 Nukiyama-Tanasawa 分布似乎最适合弦长数据。 [12] He 血小板和球形气泡的尺寸分布被评估为温度和剂量的函数。 [13] 为了验证 EMIS 方法，我们使用高速成像装置比较了在四种不同的共振频率值下激发的气泡产生的微流模式：1）fr，B，假设球形气泡的理论 fr，2）fr，Beq，基于“等效球形气泡”概念的理论 fr，其表面积等于振动的空气-水界面面积，3) fr,Pf，基于 EMIS 的压电换能器 fr，和 4) fr,Cf，与换能器结合的微流控芯片的基于 EMIS 的 fr。 [14] 在所有三种合金中都观察到多面气泡和球形气泡，但多面气泡的边缘具有不同的优先取向：主要在 TiVTa 中，主要在 V 合金中，并在 TiVNbTa 中共同出现。 [15] 详细研究了气泡雷诺数（Re）大于200时界面污染程度（以帽角θ描述）对球形气泡流体动力学特性的影响。 [16] 我们通过实验观察和理论上分析了明胶凝胶中球形气泡在超声照射下的振荡，以量化粘弹性对非线性气泡动力学的影响。 [17] 由于普遍假设球形气泡无法达到稳定平衡，它们令人惊讶的长期稳定性仍然存在争议。 [18] 通过高速摄像机监测球形气泡在正丙醇和十二烷基硫酸钠 (SDS) 水溶液中的运动。 [19] 令人惊讶的是，该理论还定量地解释了在模拟肥皂泡沫模型中观察到的非平凡动力学，其特征是球形气泡的产生和破坏，这表明这两个非平衡系统属于同一普遍性类别。 [20] 由OH-空位复合物组成的球形气泡通过吸收OH单体并在退火条件下与其他气泡聚结而生长。 [21] 在本文中，我们介绍了对球形气泡形态的研究。 N维流体。 [22] 另一方面，Rayleigh Plesset 常微分方程用于解释球形气泡假说下的这一现象。 [23] 在这项工作中，提出了一种简便且可扩展的方法来生成具有长期稳定性的非球形气泡。 [24] 在这里，我们开发了与球形气泡耦合的地震气枪的准一维模型，该模型考虑了燃烧室内的气体动力学和空间可变减压，以研究对源特征初始峰值的控制。 [25] 为了了解湍流对上升气泡横向迁移的影响，对受水平方向均匀剪切的垂直流动影响的均匀湍流中球形气泡的运动进行了完全解析的模拟。 [26] 我们研究了气泡破裂的动力学，这在性质上类似于球形气泡的破裂。 [27] 半径为 r 的球形气泡 (Pbub) 内的气体和蒸汽分压之和超过环境大气压力 (Pamb)，由 Young-LaPlace 方程给出： Pbub = Pamb + 2γ/r固体表面。 [28] 在气泡模型中，随机位置、大小和形状的球形和非球形气泡通过蒙特卡罗方法产生。 [29] 据推测，根据已知的观察，空腔在槽角附近的涡旋核心中表现为球形气泡。 [30] 球形气泡获得的结果与 Legendre 等人的预测一致。 [31] MMT 嵌入和剥离的高度可能使形成相对均匀和球形的气泡、机械强度高的薄膜和粘弹性连续相成为可能，所有这些都可能有助于稳定气泡以抵抗各种不稳定机制。 [32] 球形气泡动力学方程首先由 Rayleigh (1917) 和 Plesset (1949) 推导出并使用。 [33] 为了阐明气泡半径对浸没式激光喷丸能力的影响，对壁面半球形气泡随气泡半径的变化进行了流体/材料双向耦合数值分析。 [34] 考虑了球形气泡和肥皂膜的极限情况。 [35] 通过同时考虑平移来计算作用在球形气泡上的主要 Bjerknes 力。 [36] 通过捕获的图像对花瓣状形状进行定性描述，而通过纵横比分析非球形气泡。 [37]
Small Spherical Bubble 小球泡
The experimental rising velocities of small spherical bubbles radius agreed well with the theoretical value by the Navier-Stokes equation. [1] In this paper we study finite particle Reynolds number effects up to $Re_p=50$ on the dynamics of small spherical bubbles and solid particles in an isotropic turbulent flow. [2] Solver Comsol Multiphysics was able to precisely calculate the movement of smaller and larger bubbles; due to the 2D rotational symmetry, better results were obtained for small spherical bubbles. [3] Nevertheless, this model has been developed for the simulation of small spherical bubbles, considered as a dispersed field. [4] The heat transfer governing mechanism of deformable vapor slugs is different from that of small spherical bubbles. [5]小球泡半径的实验上升速度与Navier-Stokes方程的理论值吻合较好。 [1] 在本文中，我们研究了高达 $Re_p=50$ 的有限粒子雷诺数对各向同性湍流中小球形气泡和固体粒子动力学的影响。 [2] Solver Comsol Multiphysics 能够精确计算越来越大的气泡的运动；由于二维旋转对称性，小球形气泡获得了更好的结果。 [3] 尽管如此，这个模型已经被开发用于模拟小球形气泡，被认为是一个分散的场。 [4] 可变形蒸汽段塞的传热控制机制与小球状气泡的传热控制机制不同。 [5]
Initially Spherical Bubble
We investigate the modes of deformation of an initially spherical bubble immersed in a homogeneous and isotropic turbulent background flow. [1] A simulation is conducted of the growth and collapse of an initially spherical bubble with an initial radius of 50 µm near a wall subjected to the acoustic field resulting from a transducer face oscillating with a frequency of 30 kHz and a displacement amplitude of 0. [2]我们研究了浸入均匀和各向同性湍流背景流中的初始球形气泡的变形模式。 [1] 对初始半径为 50 µm 的初始球形气泡在壁附近的生长和塌陷进行了模拟，该气泡受到由频率为 30 kHz 且位移幅度为 0 的换能器面产生的声场的影响。 [2]
Sized Spherical Bubble
The modified Rayleigh–Plesset equation is analyzed to determine the bubble growth rate by assuming equal-sized spherical bubble clouds. [1] The separation trajectory of sized spherical bubble ranging from 0. [2]通过假设相同大小的球形气泡云，分析修正的 Rayleigh-Plesset 方程以确定气泡的生长速率。 [1] 大小球形气泡的分离轨迹范围为 0。 [2]
Rising Spherical Bubble
The main objective of this work is to develop a numerical model to analyze heat transfer and condensation of a rising spherical bubble. [1] Then, we applied the method to the reconstruction of the three-dimensional trajectories of single rising spherical bubbles, whose results were in favorable agreement with previous studies. [2]这项工作的主要目的是开发一个数值模型来分析上升球形气泡的传热和冷凝。 [1] 然后，我们将该方法应用于单个上升球状气泡三维轨迹的重建，其结果与前人的研究结果一致。 [2]
Single Spherical Bubble 单球泡
Several studies have investigated the dynamics of a single spherical bubble at rest under a nonstationary pressure forcing. [1] Then, a sliding mode controller (SMC) is designed for the nonlinear system to regulate the radius of a single spherical bubble and prevent collapse occurrence, which has a great importance in some industrial applications. [2]几项研究已经研究了在非平稳压力强迫下静止的单个球形气泡的动力学。 [1] 然后，针对非线性系统设计了一种滑模控制器（SMC）来调节单个球形气泡的半径并防止坍塌的发生，这在一些工业应用中具有重要意义。 [2]
spherical bubble shape
In particular, we derive general expressions for the bubble collision mechanism in the envelope approximation and the so-called bulk flow model, and we also consider deformations from the spherical bubble shape. [1] The nanoparticle deposition was found to have a retarding effect on the bubble movement and led to a more elliptical shape rather than a spherical bubble shape. [2] Based on our observations, we deduce a stick-slip mechanism based on asymmetric fore-aft plasmonic heating: local evaporation at the front TPCL due to plasmonic heating de-pins and extends the front TPCL, followed by the advancement of the trailing TPCL to resume a spherical bubble shape to minimize surface energy. [3] Synthetic H$\alpha$ and 24 $\mu$m emission maps predict the same apparent spherical bubble shape with quantitative properties similar to observations. [4]特别是，我们推导了包络近似和所谓的体流模型中气泡碰撞机制的一般表达式，并且我们还考虑了球形气泡形状的变形。 [1] 发现纳米颗粒沉积对气泡运动具有阻滞作用，并导致气泡形状更接近椭圆形而不是球形。 [2] 根据我们的观察，我们推断出一种基于不对称前后等离子体加热的粘滑机制：由于等离子体加热在前 TPCL 处局部蒸发，使前 TPCL 脱销并延伸前 TPCL，随后尾随 TPCL 的推进恢复球形气泡形状以最小化表面能。 [3] 合成 H$\alpha$ 和 24 $\mu$m 发射图预测具有与观测相似的定量特性的相同明显球形气泡形状。 [4]
spherical bubble model 球泡模型
In this paper we make use of a suitably adapted spherical bubble model to account for these observations. [1] We find that for low We, as the bubble keeps spherical, its drag coefficients can be well predicted by the previous spherical bubble models. [2] To this end, a spherical bubble model is applied in statistical fashion. [3]在本文中，我们利用适当调整的球形气泡模型来解释这些观察结果。 [1] 我们发现，对于低 We，由于气泡保持球形，其阻力系数可以通过之前的球形气泡模型很好地预测。 [2] 为此，以统计方式应用球形气泡模型。 [3]
spherical bubble collapse
We numerically investigate the effect of non-condensable gas inside a vapor bubble on bubble dynamics, collapse pressure and pressure impact of spherical and aspherical bubble collapses. [1] Vortex ring appears after aspherical bubble collapses. [2]我们通过数值研究了蒸汽泡内的不凝性气体对气泡动力学、塌陷压力以及球形和非球面气泡塌陷的压力影响的影响。 [1] 非球面气泡破裂后出现涡环。 [2]