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Related Concept Videos

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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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 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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Radiation: Applications01:17

Radiation: Applications

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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.
The average...
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Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Updated: Nov 4, 2025

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Near-Field Radiative Heat Transfer Eigenmodes.

Stephen Sanders1, Lauren Zundel1, Wilton J M Kort-Kamp2

  • 1Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87106, USA.

Physical Review Letters
|May 28, 2021
PubMed
Summary
This summary is machine-generated.

Near-field electromagnetic interactions significantly boost radiative heat transfer beyond blackbody limits. This study introduces a theoretical framework to analyze the temporal dynamics of heat transfer in nanostructures, revealing key thermalization principles.

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Area of Science:

  • Physics
  • Nanotechnology
  • Thermodynamics

Background:

  • Far-field blackbody radiation sets limits on heat transfer.
  • Near-field electromagnetic interactions enable enhanced radiative heat transfer at the nanoscale.

Purpose of the Study:

  • To develop a theoretical framework for analyzing the temporal dynamics of radiative heat transfer in nanostructure ensembles.
  • To identify fundamental principles governing the thermalization of nanostructures.

Main Methods:

  • Utilized an eigenmode expansion of governing equations.
  • Developed a theoretical framework for temporal dynamics analysis.
  • Applied to ensembles of nanostructures.

Main Results:

  • Identified fundamental principles of nanostructure thermalization.
  • Revealed general, often counterintuitive, dynamics of near-field heat transfer.
  • Demonstrated enhanced radiative heat transfer surpassing far-field limits.

Conclusions:

  • The developed formalism provides an elegant and precise approach.
  • Enables efficient analysis of near-field radiative heat transfer dynamics in large nanoparticle systems.