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Related Concept Videos

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Heat Engines

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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 Transfer01:14

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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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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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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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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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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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Updated: Jan 11, 2026

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
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Microscopic heat engines with hydrodynamic flow.

P S Pal1, Sourabh Lahiri2, Arnab Saha3

  • 1Korea Institute for Advanced Study, School of Physics, Seoul 02455, Korea.

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|November 18, 2025
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Summary
This summary is machine-generated.

Hydrodynamic flows significantly impact stochastic heat engines. Deviations from circular flow allow harnessing work from the flow field, but high spinning frequencies prevent thermodynamic work production.

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Area of Science:

  • Colloidal science
  • Statistical mechanics
  • Thermodynamics

Background:

  • Colloidal particles are key components in stochastic heat engines.
  • Hydrodynamic flows are commonly observed in colloidal suspensions.
  • The influence of these flows on engine performance is not fully understood.

Purpose of the Study:

  • To investigate how hydrodynamic flows affect the output parameters of colloidal stochastic heat engines.
  • To analyze the work done by external shear flows and internal trap forces.
  • To explore an extended model with a spinning particle influencing the engine dynamics.

Main Methods:

  • Studying a single colloidal particle in a time-periodic harmonic trap under steady linear shear flow.
  • Analyzing different flow natures: circular, elliptic, and hyperbolic.
  • Simulating an extended model with a spinning particle influencing colloidal particle dynamics.

Main Results:

  • In the quasistatic limit, flow work dominates over trap work for non-circular flows.
  • Work done by elliptic flow is positive; hyperbolic flow can yield negative work (harnessing energy).
  • In the extended model, high spinning frequencies lead to flow work dominance, preventing thermodynamic work.

Conclusions:

  • The nature of hydrodynamic flow critically determines energy dynamics in colloidal heat engines.
  • External flows can be harnessed for work, especially hyperbolic flows, under specific conditions.
  • Engine performance is limited by flow dominance at high spinning frequencies in extended systems.