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Related Concept Videos

The Carnot Cycle and the Second Law of Thermodynamics01:20

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The Carnot engine works between two heat reservoirs of fixed temperatures. The Carnot cycle begs the following question: Is it possible to devise a heat engine that is more efficient than a Carnot engine between two fixed temperatures? The answer lies in designing a Carnot refrigerator.
Since the individual steps in a Carnot cycle can be reversed, the entire cycle is, thus, reversible. If a Carnot cycle is reversed, it becomes a Carnot refrigerator. It extracts heat Qc from a cold reservoir at...
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The Carnot Cycle01:30

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Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
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Bernoulli's Equation00:59

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In the middle of the nineteenth century, it was observed that two trains passing each other at a high relative speed get pulled towards each other. The same occurs when two cars pass each other at a high relative speed. The reason is that the fluid pressure drops in the region where the fluid speeds up. As the air between the trains or the cars increases in speed, its pressure reduces. The pressure on the outer parts of the vehicles is still the atmospheric pressure, while the resultant...
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Bernoulli's Principle01:01

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Bernoulli's equation incorporates how fluid pressure changes across a static, incompressible fluid by equating the kinetic energy contribution to zero. It is also helpful in analyzing horizontal flows in which the gravitational energy density is constant throughout. The latter equation is so useful that it is called Bernoulli's principle. According to Bernoulli's principle, the fluid pressure drops if the speed increases and vice versa.
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Heat Engines01:10

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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.
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The hypothetical Carnot cycle consists of an ideal gas subjected to two isothermal and two adiabatic processes. Since the internal energy of an ideal gas depends only on its temperature, which is the same before and after the completion of the Carnot cycle, there is no change in its internal energy. Hence, using the first law of thermodynamics, the total heat exchanged by the ideal gas equals the total work done. Thus, we can quantify the efficiency of the Carnot cycle via the heat exchanged...
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A Rapid Method for Modeling a Variable Cycle Engine
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Brownian Carnot engine.

I A Martínez1,2, É Roldán1,3,4, L Dinis4,5

  • 1ICFO-Institut de Ciències Fotòniques, Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain.

Nature Physics
|June 23, 2016
PubMed
Summary
This summary is machine-generated.

Researchers experimentally demonstrated a microscopic Carnot engine using a single Brownian particle. This engine can surpass the Carnot efficiency limit for short cycles, offering insights into nano-motor design.

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Area of Science:

  • Thermodynamics
  • Statistical Mechanics
  • Nanotechnology

Background:

  • The Carnot cycle sets the theoretical efficiency limit for heat engines.
  • Microscopic engines operate under stochastic thermodynamics, influenced by thermal fluctuations.
  • Understanding efficiency limits at the nanoscale is crucial for developing new technologies.

Purpose of the Study:

  • To experimentally realize and study a microscopic Carnot engine.
  • To investigate the energetics and efficiency fluctuations of a single-particle engine.
  • To explore potential violations of the Carnot limit at microscopic scales.

Main Methods:

  • Utilized a single optically trapped Brownian particle as the working substance.
  • Conducted an exhaustive study of the engine's energetics.
  • Analyzed the fluctuations of finite-time efficiency.

Main Results:

  • Demonstrated an experimental realization of a microscopic Carnot engine.
  • Showed that the Carnot efficiency bound can be surpassed for a limited number of non-equilibrium cycles.
  • Characterized the engine's energetics and sources of irreversibility.

Conclusions:

  • Microscopic engines can exceed classical efficiency limits due to thermal fluctuations.
  • The study provides fundamental insights into the operation of nanoscale energy transducers.
  • Results can inform the design of more efficient nano-motors.