Two bodies initially at different temperatures gathered into an isolated container exchange heat and reach an equilibrium state with a common final temperature. During the process, the system is out of equilibrium and its intermediate temperature is not well defined. By conceiving a quasi-static process with infinitesimal steps from the initial to the final state, a graphic representation of the intermediate temperatures is possible. We imagine an isolated container with the bodies in compartments separated by a wall, as shown in Fig. 1. If the conductivity of the wall is controlled, the heat exchange is made gradually through a sequence of very small portions of heat flowing from one body to the other. Each step is followed by a “dead time” in order to reach a momentary equilibrium state. These graphs are useful for students who need to analyze a phase change.
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PAPERS| September 01 2018
Graphic Representation of Quasi-Static Heat Exchange
Phys. Teach. 56, 386–388 (2018)
Roberto Rojas, Patricio Robles; Graphic Representation of Quasi-Static Heat Exchange. Phys. Teach. 1 September 2018; 56 (6): 386–388. https://doi.org/10.1119/1.5051154
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