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Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

3.2K
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...
3.2K
Radiation: Applications01:17

Radiation: Applications

1.1K
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
1.1K
Absorption of Radiation01:05

Absorption of Radiation

703
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
703
Dual Nature of Electromagnetic (EM) Radiation01:10

Dual Nature of Electromagnetic (EM) Radiation

1.9K
Electromagnetic (EM) radiation consists of electric and magnetic field components oscillating in planes perpendicular to each other and mutually perpendicular to radiation propagation through space. EM radiation can be classified as a wave, characterized by the properties of waves such as wavelength (denoted as λ) and frequency (represented by ν).
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the...
1.9K
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 Transfer I01:14

Mechanisms of Heat Transfer I

4.1K
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.
4.1K

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相关实验视频

Updated: Jun 4, 2025

Characterization of Thermal Transport in One-dimensional Solid Materials
05:20

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

17.3K

有扭曲的热辐射

Sathwik Bharadwaj1, Zubin Jacob1

  • 1School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.

Science (New York, N.Y.)
|December 19, 2024
PubMed
概括

扭曲的碳纳米管丝在高温下产生旋转的热波. 这一发现为纳米材料的热传输提供了新的见解.

科学领域:

  • 材料科学
  • 纳米技术
  • 物理

背景情况:

  • 碳纳米管 (CNT) 是具有独特热性质的先进纳米材料.
  • 了解纳米结构的热行为对于开发新技术至关重要.

研究的目的:

  • 研究扭曲的碳纳米管纤维的热发射特性.
  • 在高温下探索CNT中旋转的热波现象.

主要方法:

  • 具有特定扭曲几何形状的碳纳米管丝的制造.
  • 测量热辐射的高温实验.
  • 热浪传播和特征的分析.

主要成果:

  • 有扭曲几何形状的碳纳米管丝已经成功制造出来.
  • 在高温下观察这些细丝发出的旋转热波.
  • 发射热波的频率和振幅的表征.

结论:

  • 碳纳米管纤维的扭曲几何结构显著影响它们的热辐射.
  • 旋转热浪是CNT中一种新型的热传输方式.
  • 这些发现为使用工程纳米材料的新型热管理应用提供了基础.

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