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相关概念视频

Buoyancy and Stability for Submerged and Floating Bodies01:11

Buoyancy and Stability for Submerged and Floating Bodies

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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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Buoyancy00:59

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When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy.  The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
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When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The...
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When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
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Excess Pressure Inside a Drop and a Bubble01:13

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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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Design Example: Application of Archimedes' Principle01:11

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Archimedes' principle is fundamental in analyzing the buoyant force and stability of floating bodies. In this example, a wooden block with a rectangular section floats in seawater. Based on the block's dimensions, its specific gravity and the specific weight of seawater are used to find the volume of water displaced and the center of buoyancy.
The volume of seawater displaced by the block is determined by first calculating the block's weight. This is done by multiplying the...
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相关实验视频

Updated: Jul 16, 2025

Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions
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通过浮力和棒跳溶解的相互作用发射一个滴.

Binglin Zeng1, Haichang Yang1,2, Ben Bin Xu3

  • 1Department of Chemical and Materials Engineering, University of Alberta, Edmonton, T6G 1H9, Canada.

Small (Weinheim an der Bergstrasse, Germany)
|September 19, 2023
PubMed
概括

一滴溶解聚合物溶液在水中只有在显著收缩后才升起,这违背了典型的浮力原理. 这种现象是由棒跳溶解动力学和足够的浮力力量驱动的,用于可编程的落下运动.

关键词:
放下分离的脱落.在点滴反应反应反应.阶段分离的阶段分离.棒跳跳溶解溶解的方法

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科学领域:

  • 物理化学 物理化学
  • 流体动力学 流体动力学
  • 材料科学 材料科学 材料科学

背景情况:

  • 阿基米德的原理通常规定浮力取决于物体的大小和相对于流体的密度.
  • 在溶液中溶解物体可以表现出由化学反应和流体相互作用影响的复杂行为.
  • 了解掉落动态对于微流体和材料加工中的应用至关重要.

研究的目的:

  • 为了研究一种新奇的现象,即溶解滴在水性酸溶液中呈现延迟升高.
  • 阐明控制溶解滴自发上升运动的关键物理机制.
  • 为了探索这种可编程下降起的潜力,用于微尺度工程应用.

主要方法:

  • 观察和分析一种溶解的聚合物溶液在酸性水性介质中的基质上掉落.
  • 滴溶解,微滴形成和与周围流体相互作用的表征.
  • 确定影响下降动态的关键因素,包括跳杆行为和阿基米德数.

主要成果:

  • 溶解滴只有在达到显著较小的大小后才会升起,这与预期的浮力行为相反.
  • 跌升是由棒跳溶解和足够的浮力力 (阿基米德数>1) 的组合启动的.
  • 滴水上升的时间可以通过初始滴水大小及其化学反应速度来控制.

结论:

  • 已经发现了一个可编程滴升的新机制,由化学溶解和流体动力学驱动.
  • 这种现象为密集介质中微观物体的控制运动提供了一种新的方法.
  • 潜在的应用包括微流体学,微机器人学和设备工程,利用自发掉落脱离.