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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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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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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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Thermal Stress01:09

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
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Updated: Jul 19, 2025

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Visibly transparent multifunctional camouflage coating with efficient thermal management.

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    This study introduces a novel coating for high-temperature infrared (IR) camouflage and thermal management. The material effectively conceals objects by reflecting IR radiation and enabling radiative cooling, significantly reducing surface temperatures.

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    Area of Science:

    • Materials Science
    • Optics
    • Thermal Engineering

    Background:

    • High-temperature infrared (IR) camouflage is essential for concealing objects but is challenging due to intense thermal radiation.
    • Existing camouflage methods struggle with the high temperatures involved, where radiation scales with the fourth power of temperature.

    Purpose of the Study:

    • To develop a novel coating for effective high-temperature IR camouflage and efficient thermal management.
    • To investigate the coating's potential for radiative cooling and applications in smart windows and water purification.

    Main Methods:

    • Fabrication of a composite coating integrating hyperbolic metamaterial (HMM), gradient epsilon near zero (G-ENZ) material, and polymer.
    • Analysis of the coating's optical properties, including visible transparency and IR reflectivity.
    • Calculation of surface temperature reduction using emissivity characteristics and combination with silica aerogel.

    Main Results:

    • The HMM component provides visible transparency and IR reflectivity for camouflage.
    • G-ENZ and polymer components enable radiative cooling via specific mode support and vibrational absorption.
    • A combined silica aerogel and coating system reduced surface temperature from 2000 K to 750 K.

    Conclusions:

    • The proposed multifunctional coating achieves high-temperature IR camouflage and efficient thermal management.
    • The coating shows potential for visible-transparent radiative cooling, smart windows, and water condensation/purification applications.