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Mechanisms of Heat Transfer II01:20

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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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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.
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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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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).
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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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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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Characterization of Thermal Transport in One-dimensional Solid Materials
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Thermal radiation with a twist.

Sathwik Bharadwaj1, Zubin Jacob1

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

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|December 19, 2024
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Summary
This summary is machine-generated.

Twisted carbon nanotube filaments generate spinning heat waves at high temperatures. This discovery offers new insights into thermal transport in nanomaterials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physics

Background:

  • Carbon nanotubes (CNTs) are advanced nanomaterials with unique thermal properties.
  • Understanding thermal behavior in nanostructures is crucial for developing new technologies.

Purpose of the Study:

  • To investigate the thermal emission characteristics of twisted carbon nanotube filaments.
  • To explore the phenomenon of spinning heat waves in CNTs at elevated temperatures.

Main Methods:

  • Fabrication of carbon nanotube filaments with a specific twisted geometry.
  • High-temperature experiments to measure thermal emission.
  • Analysis of heat wave propagation and characteristics.

Main Results:

  • Carbon nanotube filaments with twisted geometry were successfully fabricated.
  • Observation of spinning heat waves emitted from these filaments at high temperatures.
  • Characterization of the frequency and amplitude of the emitted heat waves.

Conclusions:

  • The twisted geometry of carbon nanotube filaments significantly influences their thermal emission.
  • Spinning heat waves represent a novel mode of thermal transport in CNTs.
  • Findings provide a basis for novel thermal management applications using engineered nanomaterials.