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相关概念视频

General External Flow Characteristics01:26

General External Flow Characteristics

The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
Boundary Layer Characteristics01:18

Boundary Layer Characteristics

When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
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.
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,...
Precipitation Processes01:12

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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:

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相关实验视频

Updated: Jul 11, 2026

Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction
08:14

Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction

Published on: September 16, 2016

来自自然气流冷却塔的降雪观测.

M L Kramer, D E Seymour, M E Smith

    Science (New York, N.Y.)
    |September 24, 1976
    PubMed
    概括

    大型自然通风冷却塔可能会导致降雪. 这种在1975-1976年观察到的现象导致了积雪,并在发电厂附近的可见性降低.

    科学领域:

    • 环境科学 环境科学
    • 大气科学 大气科学
    • 工程 工程师 工程师 工程师

    背景情况:

    • 大型自然通风冷却塔在发电厂中用于散发废热.
    • 冷却塔羽毛对大气的影响,特别是在冬季,需要研究.

    研究的目的:

    • 记录和分析归因于冷却塔羽毛的降雪的发生情况.
    • 评估积雪的程度及其对可见度的影响.

    主要方法:

    • 在1975-1976年冬季进行的观测研究.
    • 在冷却塔附近对积雪和可见度的现场测量.

    主要成果:

    • 观察到来自冷却塔羽毛的降雪.
    • 在距离塔楼的距离上,积雪积累在地面上达到了2.5厘米.
    • 可见度降低到1600米以下,在地平面附近的烟雾中.

    结论:

    • 冷却塔的羽毛可能导致局部降雪事件.
    • 这些事件可能会影响地面条件和可见度,需要进一步研究减缓策略.

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    Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction
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    Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
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    Published on: June 1, 2016

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    Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

    Published on: April 30, 2018