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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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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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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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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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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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Characterization of Thermal Transport in One-dimensional Solid Materials
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Thermal transport in model copper-polyethylene interfaces.

Yuanyang Ren1, Kai Wu1, David F Coker2

  • 1State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, 28 Xianning West Road, Xi'an 710049, Shaanxi, China.

The Journal of Chemical Physics
|November 10, 2019
PubMed
Summary
This summary is machine-generated.

Optimizing thermal transport at copper-polyethylene interfaces is crucial. Perpendicular lamellar polymer orientation significantly enhances thermal conductivity, with electronic contributions further boosting heat flux.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Understanding thermal transport at metal-polymer interfaces is key for advanced material design.
  • Traditional models often simplify the complex interplay of electronic and phonon contributions.

Purpose of the Study:

  • To investigate thermal transport mechanisms at copper-polyethylene interfaces.
  • To explore the impact of polymer phase and orientation on thermal conductivity.
  • To evaluate the role of electron-phonon coupling in copper's thermal properties.

Main Methods:

  • Utilized two-temperature nonequilibrium molecular dynamics (TTNEQMD) simulations.
  • Compared TTNEQMD results with standard nonequilibrium molecular dynamics (NED) simulations.
  • Investigated crystalline, amorphous, and lamellar polymer phases and their orientations.

Main Results:

  • Interface thermal conductivity increased over 40-fold with perpendicular lamellar polymer orientation compared to amorphous or parallel crystalline phases.
  • Phonon contribution to copper's thermal conductivity enhanced up to threefold with electron-phonon coupling.
  • Incorporating electronic thermal transport in copper significantly increased overall heat flux.

Conclusions:

  • Polymer chain orientation dramatically influences metal-polymer interface thermal conductivity.
  • Electron-phonon coupling and electronic transport in metals are critical for efficient heat dissipation.
  • Findings guide the design of materials with tailored thermal and electrical properties.