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An Otto engine is a four-stroke engine that uses a mixture of gasoline and air as the working fuel. The fuel is injected into the cylinder, and the piston is moved completely down so that the cylinder is at maximum volume. By moving the piston up, adiabatic compression takes place. The spark plug ignites the gasoline-air mixture, and the burning fuel adds heat to the system at a constant volume. The heated mixture expands adiabatically and gets further cooled by exhausting heat, and this cyclic...
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Multilayer Graphene as an Endoreversible Otto Engine.

Nathan M Myers1, Francisco J Peña2,3, Natalia Cortés4,5

  • 1Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA.

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|May 13, 2023
PubMed
Summary
This summary is machine-generated.

Layered graphene in magnetic fields enhances heat engine efficiency. Multilayer graphene engines can outperform classical cycles, offering potential for advanced quantum devices.

Keywords:
graphenemagnetic cyclequantum Otto cyclequantum thermodynamics

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Area of Science:

  • Thermodynamics
  • Materials Science
  • Quantum Devices

Background:

  • Graphene's unique electronic properties make it a candidate for advanced thermal machines.
  • The behavior of multilayer graphene is significantly influenced by external magnetic fields.
  • Endoreversible thermodynamic cycles provide a framework for analyzing heat engine performance.

Purpose of the Study:

  • To investigate the performance of a finite-time, endoreversible Otto heat engine using graphene as the working medium.
  • To explore the impact of external magnetic fields and the number of graphene layers on engine efficiency.
  • To compare the efficiency of graphene-based engines with classical Otto cycles.

Main Methods:

  • Modeling a finite-time, endoreversible Otto heat engine.
  • Utilizing graphene (monolayer, bilayer, trilayer) as the working medium.
  • Subjecting the graphene working medium to an external magnetic field.

Main Results:

  • Engine efficiency shows a simple relationship with the number of graphene layers.
  • Bilayer and trilayer graphene engines exhibit maximum power efficiency exceeding classical Otto cycles.
  • Monolayer graphene engines show efficiency at maximum power identical to classical cycles.

Conclusions:

  • Layered graphene, particularly in multilayer forms, can enhance heat engine efficiency.
  • The number of graphene layers and magnetic field strength are critical parameters for optimizing engine performance.
  • Graphene-based thermal machines show promise for applications in quantum devices.