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Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

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 purely axial,...
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
Laminar Flow01:27

Laminar Flow

Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
Laminar and Turbulent Flow01:07

Laminar and Turbulent Flow

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 streamlines...

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相关实验视频

Updated: Jul 12, 2026

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
08:10

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas

Published on: May 25, 2021

实验中使用受控的朗格穆尔血液循环.

A J Faller

    Science (New York, N.Y.)
    |August 18, 1978
    PubMed
    概括
    此摘要是机器生成的。

    实验室实验证实了Langmuir循环,这种现象发生在风和波浪模式相互作用时. 这些循环涉及水的向下运动,支持现有的数学模型.

    更多相关视频

    Image-based Lagrangian Particle Tracking in Bed-load Experiments
    10:32

    Image-based Lagrangian Particle Tracking in Bed-load Experiments

    Published on: July 20, 2017

    Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
    10:29

    Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames

    Published on: June 1, 2016

    相关实验视频

    Last Updated: Jul 12, 2026

    Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
    08:10

    Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas

    Published on: May 25, 2021

    Image-based Lagrangian Particle Tracking in Bed-load Experiments
    10:32

    Image-based Lagrangian Particle Tracking in Bed-load Experiments

    Published on: July 20, 2017

    Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
    10:29

    Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames

    Published on: June 1, 2016

    科学领域:

    • 流体动力学 流体动力学
    • 海洋学 海洋学 海洋学
    • 大气科学 大气科学

    背景情况:

    • 兰木尔环流是风驱动的地表水动态的一个关键特征.
    • 它们的形成机制,特别是风和海浪之间的相互作用,需要进一步的经验验证.
    • 以前的理论模型,如克雷克-莱博维奇模型,为这些循环提出了解释.

    研究的目的:

    • 通过实验证明正规,稳定和可重复的兰木尔循环的存在.
    • 调查Langmuir循环发生的条件.
    • 将实验观测与克雷克-莱博维奇数学模型的预测进行比较.

    主要方法:

    • 进行实验室实验,在规则的交叉波模式上控制风流.
    • 使用风和波浪水箱来模拟地表水的条件.
    • 测量观察到的循环的尺寸和行为,包括它们的波长和垂直下降运动的深度.

    主要成果:

    • 在特定的风和波的同时存在的条件下,Langmuir循环一直被观察到.
    • 循环表现出一个稳定的横风波长44厘米.
    • 血液循环中的垂直下降运动被测量到达39厘米的深度.

    结论:

    • 这些实验清楚地证明了可重复的兰格穆尔循环的存在.
    • 这些发现与克雷克-莱博维奇数学模型的一般预测一致.
    • 进一步的实验调查是必要的,以充分验证分析模型及其参数.