闭口系统与稳态稳流开口系统的相似性
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摘要
工程热力学的主要任务是研究热能和机械能相互转换的基本规律。而研究这些规律首先就要选取合适的研究对象,即系统。闭口系统与稳态稳流的开口系统就是其中两个非常重要且常用的系统。虽然这是两个不同系统,但分别基于这两个系统建立的热力学第一定律的能量方程及熵方程却对两个系统都适用。本文通过详细的推导过程,解释了能够适用的原因,让学生能够更好地理解和应用能量守恒方程及熵方程。
The main task of engineering thermodynamics is to study the basic laws of mutual transformation between thermal energy and mechanical energy.To study these laws,the appropriate research object,that is,the system,should be chosen first.The closed system and open system of steady flow are two very important and commonly used systems.Although the closed system and open system are obviously different,the energy conservation equation and entropy equation established based on these two systems,respectively,are applicable to both systems.In order to enable students to better understand and apply the first law of thermodynamics and entropy equations,the reason why they can be applied is discussed through the detailed derivation.
The main task of engineering thermodynamics is to study the basic laws of mutual transformation between thermal energy and mechanical energy.To study these laws,the appropriate research object,that is,the system,should be chosen first.The closed system and open system of steady flow are two very important and commonly used systems.Although the closed system and open system are obviously different,the energy conservation equation and entropy equation established based on these two systems,respectively,are applicable to both systems.In order to enable students to better understand and apply the first law of thermodynamics and entropy equations,the reason why they can be applied is discussed through the detailed derivation.
引文
[1]曾丹苓,敖越,张新铭,刘朝.工程热力学[M].第三版.北京:高等教育出版社,2002.
[2]谭羽非,吴家正,朱彤.工程热力学[M].第六版.北京:中国建筑工业出版社,2016.
[2]谭羽非,吴家正,朱彤.工程热力学[M].第六版.北京:中国建筑工业出版社,2016.