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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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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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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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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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Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Heating mechanism affects equipartition in a binary granular system.

Hong-Qiang Wang1, Narayanan Menon

  • 1Department of Physics, University of Massachusetts, Amherst, MA 01003-3720, USA. hqwang@physics.umass.edu

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|June 4, 2008
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Summary
This summary is machine-generated.

Differential heating in granular systems causes unequal particle energies, even when heating is rare. This study reveals how boundary heating mechanisms impact energy distribution in granular materials.

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Area of Science:

  • Physics
  • Granular Materials Science

Background:

  • Granular systems often exhibit energy nonequipartition between particle species, deviating from equilibrium predictions.
  • Experimental granular systems typically involve unequal heating of different species at system boundaries.

Purpose of the Study:

  • To investigate how the heating mechanism influences the nonequipartition of kinetic energy in binary granular systems.
  • To determine if differential boundary heating affects energy distribution throughout the granular system.

Main Methods:

  • Event-driven simulations of binary granular systems.
  • Analysis of numerical and solvable stochastic models lacking spatial dimensions.

Main Results:

  • Differential boundary heating significantly impacts kinetic energy nonequipartition, extending even to the bulk of the system.
  • The influence of the heating mechanism on energy distribution persists even when heating events are infrequent compared to particle collisions.

Conclusions:

  • The heating mechanism plays a crucial role in establishing and maintaining energy nonequipartition in granular systems.
  • Even subtle differences in boundary heating can lead to observable macroscopic effects on granular system dynamics.