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相关概念视频

Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Mechanism of heat transfer01:19

Mechanism of heat transfer

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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
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Joule-Thomson Effect01:21

Joule-Thomson Effect

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The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
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Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

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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,...
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相关实验视频

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The Diffusion of Passive Tracers in Laminar Shear Flow
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在线摩尔热传输中的局部消散.

Guoqiang Xu1, Shuihua Yang2, Xue Zhou3

  • 1School of Electronic Science & Engineering, Southeast University, Nanjing, China. guoqiang.xu@seu.edu.cn.

Nature communications
|December 14, 2025
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概括

研究人员通过工程扩散性在线系统中证明了moiré诱导的热局部化. 这一突破使莫雷物理学在静态,无动量热传输中成为可能,为可编程控制铺平了道路.

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Characterization of Thermal Transport in One-dimensional Solid Materials
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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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Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames

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相关实验视频

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Characterization of Thermal Transport in One-dimensional Solid Materials
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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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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学 材料科学 材料科学
  • 热传输是一种热传输方式.

背景情况:

  • 莫伊尔超级格子对平面带至关重要,使量子和拓系统中的定位成为可能.
  • 以前的方法依赖于非线性相互作用,这对散射系统 (如导热) 构成挑战.
  • 在热传输的线性,无动量状态下实施莫雷物理学仍然是一个重大障碍.

研究的目的:

  • 在线系统中证明莫雷诱导的热局部化.
  • 为了克服扩散式传输现象中非线性相互作用的局限性.
  • 在静态,线性系统中建立莫雷物理学的新范式.

主要方法:

  • 在线配对的双层导电系统中设计出空间变化的扩散性.
  • 调整扭转角度,以创建相称和不相称的莫雷图案.
  • 分析了调制波向量在控制周期性和局部结构中的作用.

主要成果:

  • 在不依赖于非线性相互作用的情况下实现了moiré诱导的热局部化.
  • 在不相称的准晶体中观察到无周期性热局部.
  • 将本地化过渡值与新出现的格子常数联系起来.

结论:

  • 为在静态,线性和无动量扩散系统中实施莫伊尔物理学建立了一个范式.
  • 在热量和质量运输中展示了几何可编程的非平衡控制.
  • 通过使用moiré图案,为设计具有量身定制的热性质的材料开辟了新的途径.