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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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Mechanisms of Heat Transfer01:14

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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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The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
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Related Experiment Video

Updated: Dec 9, 2025

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Effective medium theory for thermal scattering off rotating structures.

Jiaxin Li, Ying Li, Wuyi Wang

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    This summary is machine-generated.

    This study introduces a new theory for heat transfer in rotating structures, crucial for developing advanced thermal metamaterials. The findings enable precise control over thermal energy, enhancing efficiency and flexibility in smart devices.

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    Area of Science:

    • Materials Science
    • Thermodynamics
    • Applied Physics

    Background:

    • Artificial functional materials offer promising avenues for efficient thermal energy utilization.
    • Thermal metamaterials manipulate heat conduction, with effective medium theory approximating composite parameters.
    • Recent interest in moving components for thermal devices highlights limitations in current theories.

    Purpose of the Study:

    • To establish a theoretical framework for heat transfer in mechanically rotating structures.
    • To address the gap in effective medium theory for dynamic thermal systems.
    • To provide a design methodology for novel thermal metamaterials and meta-devices.

    Main Methods:

    • Development of a rigorous theoretical description for effective thermal conductivity in rotating structures.
    • Formulation of analytical expressions for multi-layered rotating structures.
    • Numerical validation of the proposed theory and demonstration of temperature distributions.

    Main Results:

    • Effective thermal conductivity of rotating structures can be accurately described in the complex plane.
    • Analytical expressions reveal the influence of rotating multi-layered structures on surrounding temperature fields.
    • Numerical simulations confirm the theoretical predictions for both rotated and unrotated configurations.

    Conclusions:

    • The developed theory provides a robust method for analyzing heat transfer in rotating thermal metamaterials.
    • This work bridges the gap between theory and application for dynamic thermal devices.
    • The findings are expected to guide the design of next-generation smart thermal management systems.