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Related Concept Videos

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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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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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
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Heat transfer behavior caused by temperature difference in reciprocating sliding contact.

Yuwei Liu1, Fuhao Ye2, Weizheng Zhang3

  • 1School of Mechanical Electronic and Information Engineering, China University of Mining and Technology, Beijing, China.

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Summary

This study analyzes heat transfer between rough surfaces. Higher frequency and amplitude increase heat flux, which stabilizes at higher interface conductance values.

Keywords:
Frequencyamplitudereciprocating sliding contactthermal contact conductance

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Area of Science:

  • Thermal Engineering
  • Surface Science
  • Computational Fluid Dynamics

Background:

  • Understanding heat transfer between contacting rough surfaces is crucial for various engineering applications.
  • Sliding motion and varying bulk temperatures introduce complex thermal phenomena.
  • Thermal contact conductance significantly influences heat dissipation at interfaces.

Purpose of the Study:

  • To investigate the heat transfer characteristics between two contacting rough surfaces under sliding reciprocating motion.
  • To analyze the impact of dimensionless amplitude, dimensionless frequency, and interface conductance on heat flux.
  • To develop a two-dimensional heat transfer model for simulating these phenomena.

Main Methods:

  • A two-dimensional heat transfer model was employed for numerical simulations.
  • The model considered different bulk temperatures and sliding reciprocating motion.
  • Simulations covered a wide range of operating parameters, including dimensionless amplitude, frequency, and interface conductance.

Main Results:

  • Dimensionless average heat flux increases with dimensionless frequency and amplitude.
  • Heat flux shows a sharp rise at lower interface conductance values.
  • The dimensionless average heat flux approaches a steady state at higher values of interface conductance and amplitude/frequency.

Conclusions:

  • The study provides insights into the complex heat transfer mechanisms at rough surface interfaces.
  • Operating parameters like frequency and amplitude are key drivers of heat transfer efficiency.
  • Interface conductance plays a critical role in heat flux, with saturation effects observed at higher values.