Pulling or pushing a piston slowly - Heat transferred?

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SUMMARY

The discussion centers on the thermodynamic principles governing the movement of a piston in a cylinder, specifically focusing on the heat transfer during slow movements. When a piston is pushed or pulled slowly, heat transfer occurs, distinguishing it from the adiabatic process where no heat is exchanged. The conversation highlights the importance of heat capacity and heat conduction in scenarios that fall between adiabatic and isothermal processes, complicating the analysis of heat transfer. Most physics literature primarily addresses the extremes of rapid (adiabatic) and very slow (isothermal) piston movements.

PREREQUISITES
  • Understanding of adiabatic and isothermal processes in thermodynamics
  • Familiarity with heat capacity and heat conduction concepts
  • Basic knowledge of piston-cylinder systems in physics
  • Ability to analyze thermodynamic systems and processes
NEXT STEPS
  • Research the principles of heat transfer in thermodynamic systems
  • Study the effects of heat capacity on piston movement
  • Learn about the mathematical modeling of adiabatic and isothermal processes
  • Explore real-world applications of piston-cylinder systems in engines
USEFUL FOR

This discussion is beneficial for physics students, engineers, and anyone interested in thermodynamics, particularly those studying heat transfer in mechanical systems.

MechRocket
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i know if you push or pull a piston QUICKLY, no heat is transferred (adiabatic process).


But what if you push or pull a piston slowly? would heat be transferred in or out if you Push slowly? Pull slowly?

why?


thanks. i can't find the answer in my book, they just talk about the Quickly case.
 
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1. May i assume you are asking about the typical piston with compression rings? 2. would you like non Physics degree guys input on this matter or prefer to keep it in the degreed realm. answer will not offend, just do not want to waste your time
 
Last edited:
MechRocket said:
i know if you push or pull a piston QUICKLY, no heat is transferred (adiabatic process).


But what if you push or pull a piston slowly? would heat be transferred in or out if you Push slowly? Pull slowly?

why?


thanks. i can't find the answer in my book, they just talk about the Quickly case.

Most psysics books will only talk about 2 cases, the adiabatic case, where you move the piston so quickly that no heat is transferred or the isothermal case where the piston is moved so slowly that the temperature stays equal to the surroundings.

Anything in between means the heat capacity and heat conduction of the cylinder becomes important and the problem will become much more complicated.
 

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