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Related Concept Videos

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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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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Mechanism of heat transfer01:19

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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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Mechanisms of Heat Transfer I01:14

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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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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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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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Attenuating Super-Planckian Radiative Heat Transfer in Nanoscale Structures.

Ayan Majumder1, Kanishka Panda1, Rohith Mittapally1

  • 1Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.

Nano Letters
|December 31, 2025
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Summary
This summary is machine-generated.

Researchers found that polymers can reduce super-Planckian radiative heat transfer, a phenomenon limiting nanoscale thermal sensors. Using Parylene-C instead of silicon nitride significantly suppresses this enhanced thermal coupling, improving calorimeter performance.

Keywords:
Parylene-Cguided mode transporthigh resolution calorimetryradiative heat transfersilicon nitridesuper-Planckiansuspended membranes

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Radiative heat transfer between nanoscale structures can exceed the blackbody limit, known as super-Planckian radiative heat transfer.
  • This phenomenon limits the performance of high-resolution calorimeters used in nanoscale thermal sensing, often fabricated from silicon nitride (SiN).

Purpose of the Study:

  • To investigate the attenuation of super-Planckian radiative heat transfer using polymers.
  • To demonstrate improved performance in nanoscale thermal sensing devices by suppressing enhanced thermal coupling.

Main Methods:

  • Computational modeling to analyze the density of guided-modes and absorption spectra of materials.
  • Experimental fabrication and testing of devices using Parylene-C and silicon nitride (SiN).

Main Results:

  • Calculations showed Parylene-C has fewer guided-modes and lower absorption, suppressing super-Planckian coupling up to 10-fold compared to SiN.
  • Experiments confirmed that Parylene-C devices exhibit attenuated radiative coupling compared to SiN devices.

Conclusions:

  • Employing polymers like Parylene-C can significantly attenuate super-Planckian radiative heat transfer.
  • This attenuation leads to improved performance in high-resolution calorimeters for nanoscale thermal sensing.