https://scholars.lib.ntu.edu.tw/handle/123456789/409782
標題: | Investigating Friction as a Main Source of Entropy Generation in the Expansion of Confined Gas in a Piston-and-Cylinder Device | 作者: | Kang D.-Y. Liou K.-H. Chang W.-L. |
關鍵字: | Analogies/Transfer;First-Year Undergraduate/General;Gases;Physical Chemistry;Second-Year Undergraduate;Thermodynamics;Upper-Division Undergraduate | 公開日期: | 2015 | 卷: | 92 | 期: | 10 | 起(迄)頁: | 1667-1671 | 來源出版物: | Journal of Chemical Education | 摘要: | The expansion or compression of gas confined in a piston-and-cylinder device is a classic working example used for illustrating the First and Second Laws of Thermodynamics. The balance of energy and entropy enables the estimation of a number of thermodynamic properties. The entropy generation (also called entropy production) resulting from this process can also be used to determine the feasibility and reversibility of a process. In this work, we present an extended discussion involving quantitative analysis of the effects of friction between a piston and the interior wall of a cylinder. Our findings indicate that the friction force caused by the movement of the piston is a main source of entropy generation in this process. This explanation does not appear in most textbooks dealing with similar problems. We also discuss, from a quantitative perspective, the effects of friction on the dynamic physical and thermodynamic properties, including entropy generation. Our findings suggest that engaging students in a discussion related to piston-and-cylinder problems involving the effects of friction could provide valuable insight into entropy generation in practical applications. ? 2015 The American Chemical Society and Division of Chemical Education, Inc. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/409782 | ISSN: | 00219584 | DOI: | 10.1021/acs.jchemed.5b00361 |
顯示於: | 化學工程學系 |
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