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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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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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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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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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Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
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Updated: Sep 19, 2025

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Nonclassical Heat Transfer and Recent Progress.

Chuanjin Su1, Huan Wu1, Lingyun Dai1

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Explore non-classical heat transfer in solids beyond Fourier's law, including ballistic transport and phonon hydrodynamics. Understanding phonon dual nature is key for advanced materials and thermal management applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Traditional heat transfer models like Fourier's law assume local equilibrium and diffusive transport.
  • Nanotechnology and novel materials exhibit non-classical heat transfer phenomena.
  • These phenomena include ballistic transport, phonon hydrodynamics, and Anderson localization.

Purpose of the Study:

  • To review state-of-the-art findings in non-classical heat transfer in solids.
  • To highlight the importance of phonons' dual particle-wave nature.
  • To discuss emerging areas like chiral and topological phonons.

Main Methods:

  • Boltzmann transport equation
  • Molecular dynamics simulations
  • Advanced spectroscopy techniques

Main Results:

  • Non-classical heat transfer phenomena extend beyond diffusive transport.
  • Phonon dual nature (particle-like and wave-like) is crucial for understanding these phenomena.
  • New research areas like chiral and topological phonons offer advanced phonon engineering.

Conclusions:

  • Integrating particle and wave models is essential for complex heat transfer in modern materials.
  • Advancements enable designing materials with tailored thermal properties.
  • Potential applications include thermal management, energy technologies, and quantum science.