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Related Concept Videos

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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Conduction, Convection and Radiation: Problem Solving01:20

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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.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
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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

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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Current Density01:21

Current Density

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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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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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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

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Heat conduction in a one-dimensional aperiodic system.

Yong Zhang1, Hong Zhao

  • 1Department of Physics, Lanzhou University, Lanzhou 730000, China.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 21, 2002
PubMed
Summary
This summary is machine-generated.

Quasiperiodic and fractal lattice models show unique low-temperature energy transport, unlike periodic or disordered ones. At high temperatures, all models exhibit similar energy transport properties, relating to localization theory.

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Characterization of Thermal Transport in One-dimensional Solid Materials
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Characterization of Thermal Transport in One-dimensional Solid Materials
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Area of Science:

  • Condensed matter physics
  • Statistical mechanics
  • Nonlinear dynamics

Background:

  • Understanding energy transport in materials is crucial for thermal management and energy harvesting.
  • One-dimensional lattice models provide a simplified yet powerful framework for studying fundamental physical phenomena.
  • Aperiodic structures, including quasiperiodic and fractal lattices, present unique challenges and opportunities in condensed matter physics.

Purpose of the Study:

  • To investigate and compare the energy transport properties of one-dimensional nonlinear aperiodic lattice models.
  • To identify unique behaviors in quasiperiodic and fractal lattices compared to periodic and disordered systems.
  • To explore the relationship between observed energy transport phenomena and localization theory.

Main Methods:

  • Simulation of one-dimensional nonlinear lattice models.
  • Analysis of energy transport properties across different temperature regimes (low and high).
  • Comparison of aperiodic (quasiperiodic, fractal) models with periodic and disordered counterparts.

Main Results:

  • Quasiperiodic and fractal models exhibit critical macroscopic behavior in the low-temperature region.
  • All studied models (periodic, disordered, quasiperiodic, fractal) display similar energy transport properties in the high-temperature region.
  • The observed macroscopic behaviors are discussed in the context of localization theory.

Conclusions:

  • Aperiodic lattice structures possess distinct energy transport characteristics, particularly at low temperatures.
  • Temperature plays a critical role in determining the energy transport behavior of these lattice models.
  • The findings contribute to the understanding of energy localization and transport in complex, disordered, and quasiperiodic systems.