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相关概念视频

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.
4.3K
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

3.3K
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...
3.3K
Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

6.7K
Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
6.7K
Mechanism of heat transfer01:19

Mechanism of heat transfer

1.2K
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...
1.2K
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

339
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...
339
Thermal Strain01:19

Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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相关实验视频

Updated: Jul 13, 2025

Characterization of Thermal Transport in One-dimensional Solid Materials
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Characterization of Thermal Transport in One-dimensional Solid Materials

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在没有宏观温度梯度的情况下,可调节的导热力.

Haohan Tan1, Yuguang Qiu1, Liujun Xu2

  • 1Department of Physics, State Key Laboratory of Surface Physics, and Key Laboratory of Micro and Nano Photonic Structures (MOE), Fudan University, Shanghai 200438, China.

Physical review. E
|October 18, 2023
PubMed
概括
此摘要是机器生成的。

研究人员在介电晶体中发现了没有温度梯度的导热力. 这个力,这个力.

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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

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A Gusseted Thermogradient Table to Control Soil Temperatures for Evaluating Plant Growth and Monitoring Soil Processes
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科学领域:

  • 固态物理 固态物理
  • 音频电子系统 音频电子系统
  • 材料科学 材料科学 材料科学

背景情况:

  • 导热力在工程和生物化学中至关重要.
  • 由于固定的方向和温度梯度要求,当前的方法面临着调节这种力的挑战.

研究的目的:

  • 为了研究在零平均温度梯度条件下存在的导热力.
  • 为了探索热导力力方向的可调性.

主要方法:

  • 基于声子气体的动量守恒定律的分析.
  • 考虑波形导热,特别是平面,零级贝塞尔和第一级贝塞尔第二声模式.

主要成果:

  • 在没有净温度梯度的介电晶体中证明了导热力.
  • 展示了高度可调的力方向,可控制沿着或对抗第二声传播.

结论:

  • 导热力可以存在,甚至在温度波动的情况下也可以被操纵.
  • 开辟了控制晶体局部导热率的途径,用于新的应用.