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Related Concept Videos

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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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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Joule-Thomson Effect01:21

Joule-Thomson Effect

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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.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
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Heat Flow and Specific Heat01:12

Heat Flow and Specific Heat

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Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
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Characterization of Thermal Transport in One-dimensional Solid Materials
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Analysis for Heat Transfer in a High Current-Passing Carbon Nanosphere Using Nontraditional Thermal Transport Model.

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    This study explores heat transfer in hollow spheres for supercapacitor electrodes. A nontraditional model shows heat transfer decreases with increasing Knudsen number at the nanoscale.

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    Area of Science:

    • Thermal transport phenomena
    • Nanoscale heat transfer
    • Materials science for energy storage

    Background:

    • Hollow carbon spheres are crucial for supercapacitor electrodes, requiring efficient heat dissipation.
    • Traditional heat conduction models (Fourier's law) fail to accurately predict thermal behavior in the nanoscale regime.
    • Understanding thermal transport is vital for optimizing supercapacitor performance (capacitance, cycle life, power density).

    Purpose of the Study:

    • To investigate thermal transport in hollow micro/nanoscale spheres under an electrical heat source.
    • To apply a nontraditional thermal transport model for accurate nanoscale predictions.
    • To analyze the influence of various parameters on heat transfer characteristics.

    Main Methods:

    • Utilizing a nontraditional thermal transport model.
    • Simulating heat transfer in hollow spheres with electrical heat sources.
    • Analyzing the impact of parameters like Knudsen number and sphere radius.

    Main Results:

    • The nontraditional model provides accurate predictions where traditional models deviate.
    • Heat transfer into the sphere's interior decreases with increasing Knudsen number.
    • Temperature and heat flux within the hollow sphere diminish as Knudsen number rises when sphere radius approaches the mean free path of heat carriers.

    Conclusions:

    • Nontraditional thermal transport models are essential for accurate analysis of nanoscale heat transfer in hollow spheres.
    • Knudsen number is a critical parameter influencing thermal behavior in these systems.
    • Findings are relevant for designing advanced materials for high-performance energy storage devices.