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Related Concept Videos

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 Use of High-resolution Infrared Thermography HRIT for the Study of Ice Nucleation and Ice Propagation in Plants
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A Triple-Mode Midinfrared Modulator for Radiative Heat Management of Objects with Various Emissivity.

Haoming Fang1,2, Wanrong Xie1,3, Xiuqiang Li1

  • 1Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, United States.

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|April 26, 2021
PubMed
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This study introduces a versatile triple-mode infrared modulator for radiative heat management. The device offers dynamic heating and cooling adaptable to any surface emissivity, advancing thermal control technologies.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Optics

Background:

  • Radiative heat management is crucial for modern technology and sustainability.
  • Current methods face challenges with varying object emissivities.
  • A universal solution for dynamic thermal control is needed.

Purpose of the Study:

  • To develop a dynamic and universal radiative heat management device.
  • To create a triple-mode mid-infrared modulator.
  • To enable passive heating and cooling for all surface emissivities.

Main Methods:

  • Fabrication of a surface-textured infrared-semiabsorbing elastomer with a metallic back reflector.
  • Utilizing biaxial strain to switch between emission, reflection, and transmission modes.
  • Analyzing and optimizing optical and mechanical properties for performance.

Main Results:

  • Demonstrated a triple-mode mid-infrared modulator.
  • Achieved significant contrast in emittance (Δε = 0.58), transmittance (Δτ = 0.49), and reflectance (Δρ = 0.39).
  • Device is suitable for all object surface emissivities.

Conclusions:

  • The developed modulator offers a new paradigm for radiation heat regulation.
  • Potential applications include wearable technology, robotics, and camouflage.
  • The device provides a universal solution for dynamic thermal management.