Jove
Visualize
联系我们

相关概念视频

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.3K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.3K
Turbulent Flow01:24

Turbulent Flow

281
Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent...
281
Laminar and Turbulent Flow01:07

Laminar and Turbulent Flow

9.1K
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
9.1K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.7K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
3.7K
Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

391
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
391
Euler's Equations of Motion01:28

Euler's Equations of Motion

567
In fluid mechanics, shear stresses arise from viscosity, which represents a fluid's internal resistance to deformation. For low-viscosity fluids, like water, these stresses are minimal, simplifying flow analysis by allowing the fluid to be treated as inviscid, or frictionless. In an inviscid fluid, shear stresses are absent, leaving only normal stresses, which act perpendicularly to fluid elements. Notably, pressure — defined as the negative of the normal stress — remains...
567

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Design of an accessible turbulence chamber for laboratory experiments.

HardwareX·2026
Same author

The mechanics of the squash nick shot.

Proceedings of the National Academy of Sciences of the United States of America·2025
Same author

Fluid Flow Analysis of Neonatal Dual-Lumen Cannulas for Venovenous Extracorporeal Membrane Oxygenation.

Journal of biomechanical engineering·2023
Same author

Force and torque-free helical tail robot to study low Reynolds number micro-organism swimming.

The Review of scientific instruments·2022
Same author

Texture Analysis of Dried Droplets for the Quality Control of Medicines.

Sensors (Basel, Switzerland)·2021
Same author

Lifetime of Surface Bubbles in Surfactant Solutions.

Langmuir : the ACS journal of surfaces and colloids·2020
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关实验视频

Updated: Sep 13, 2025

Non-chromatographic Purification of Recombinant Elastin-like Polypeptides and their Fusions with Peptides and Proteins from Escherichia coli
07:35

Non-chromatographic Purification of Recombinant Elastin-like Polypeptides and their Fusions with Peptides and Proteins from Escherichia coli

Published on: June 9, 2014

21.9K

在聚合物溶液中的弹性伪旋风.

Mithun Ravisankar1, Roberto Zenit1

  • 1Brown University, School of Engineering, 184 Hope St, Providence, Rhode Island 02912, USA.

Physical review letters
|July 31, 2025
PubMed
概括
此摘要是机器生成的。

聚合物添加剂改变了液体中的泡诱导的流. 即使没有剪切,聚合物也会产生更的能量光谱,增强流程连贯性,并在多相系统中表现出粘弹性效应.

更多相关视频

Molecular Entanglement and Electrospinnability of Biopolymers
07:59

Molecular Entanglement and Electrospinnability of Biopolymers

Published on: September 3, 2014

14.8K
Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

12.2K

相关实验视频

Last Updated: Sep 13, 2025

Non-chromatographic Purification of Recombinant Elastin-like Polypeptides and their Fusions with Peptides and Proteins from Escherichia coli
07:35

Non-chromatographic Purification of Recombinant Elastin-like Polypeptides and their Fusions with Peptides and Proteins from Escherichia coli

Published on: June 9, 2014

21.9K
Molecular Entanglement and Electrospinnability of Biopolymers
07:59

Molecular Entanglement and Electrospinnability of Biopolymers

Published on: September 3, 2014

14.8K
Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

12.2K

科学领域:

  • 流体动力学 流体动力学
  • 类风病学 类风病学 类风病学
  • 多相流程 多相流程

背景情况:

  • 液体中的泡群会产生伪流.
  • 众所周知,聚合物添加剂可以改变流体特性.

研究的目的:

  • 调查聚合物添加剂对泡诱导的伪流的影响.
  • 描述能量光谱和流程连贯性的变化.

主要方法:

  • 在聚合物溶液中对气泡群的实验研究.
  • 分析速度波动和能量谱的分析.
  • 拉格朗的拉伸统计来评估流程的一致性.

主要成果:

  • 临界聚合物度会导致更的能量光谱 (k缩放).
  • 这种新的缩放是独立于惯性极限中的气体体积分.
  • 聚合物增强了流程连贯性,拉格朗拉伸统计数据证明了这一点.

结论:

  • 粘弹性效应显著改变泡引起的流,即使在无剪切条件下.
  • 聚合物添加剂在改变多相流特性方面发挥着至关重要的作用.
  • 这些发现为复杂流体中的弹性应力提供了新的见解.