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Related Concept Videos

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A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
Whenever we consider heat engines (and associated devices such as refrigerators and heat pumps), we do not use the standard sign convention for heat and work. For convenience, we assume that the symbols Qh, Qc, and W represent only the amounts of heat transferred...
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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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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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Mechanism of heat transfer01:19

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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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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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Nanoelectromechanical Heat Engine Based on Electron-Electron Interaction.

A Vikström1, A M Eriksson1, S I Kulinich2

  • 1Department of Physics, Chalmers University of Technology, Kemigården 1, SE-412 96 Göteborg, Sweden.

Physical Review Letters
|December 24, 2016
PubMed
Summary
This summary is machine-generated.

A novel nanoelectromechanical system actuation mechanism uses heat flow, not electric current, via electron-electron interactions. This heat-driven system offers a new pathway for nanoelectromechanical device operation and study.

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Area of Science:

  • Solid State Physics
  • Nanotechnology
  • Thermodynamics

Background:

  • Nanoelectromechanical systems (NEMS) typically rely on electrical or magnetic fields for actuation.
  • Existing NEMS actuation mechanisms often involve electronic current or external alternating fields.
  • A need exists for alternative, potentially more efficient, actuation methods in NEMS.

Purpose of the Study:

  • To theoretically demonstrate mechanical actuation of a nanoelectromechanical system using heat flow.
  • To explore a novel actuation mechanism based on electron-electron interactions and deflection-dependent tunneling.
  • To establish the feasibility of such a system as a nanoelectromechanical heat engine.

Main Methods:

  • Theoretical analysis of a nanoelectromechanical system subjected to heat flow.
  • Modeling of electron-electron interactions mediating heat transfer.
  • Derivation of criteria for mechanical instability and oscillation amplitude estimation.

Main Results:

  • Demonstration of mechanical actuation solely by heat flow via electron-electron interaction.
  • Identification of deflection-dependent tunneling rates as a key mechanism.
  • Establishment of a criterion for mechanical instability leading to self-sustained oscillations.

Conclusions:

  • A new mechanism for mechanical actuation in nanoelectromechanical systems driven by heat flow is theoretically proposed.
  • The proposed system functions as a nanoelectromechanical heat engine, distinct from current-driven devices.
  • The phenomenon is theoretically predicted to be observable with current experimental techniques.