{"id":17256,"date":"2018-03-19T07:39:32","date_gmt":"2018-03-19T07:39:32","guid":{"rendered":"http:\/\/sitepourvtc.com\/?page_id=17256"},"modified":"2022-11-10T12:28:31","modified_gmt":"2022-11-10T12:28:31","slug":"thermodynamic-processes","status":"publish","type":"page","link":"https:\/\/sitepourvtc.com\/nuclear-engineering\/thermodynamics\/thermodynamic-processes\/","title":{"rendered":"Thermodynamic Processes"},"content":{"rendered":"
<\/a> During such a process, \u00a0a system starts from initial state i<\/strong>, described by a pressure pi<\/sub><\/a><\/strong>, a volume Vi<\/sub><\/a><\/strong> and a temperature Ti<\/sub><\/a><\/strong>, passes through various quasi-static states<\/strong> to a final state f<\/strong>, described by a pressure pf<\/sub><\/strong>, a volume Vf<\/sub><\/strong>, and a temperature Tf<\/sub><\/strong>. In this process, energy<\/a> may be transferred from or into the system and can be done by or on the system. One example of a thermodynamic process is increasing the pressure of gas while maintaining a constant temperature. In the following section, examples of thermodynamic processes are of the highest importance in the engineering of heat engines<\/a>.<\/p><\/div><\/div> In thermodynamics, a reversible process<\/strong> is defined as a process that can be reversed<\/strong> by inducing infinitesimal changes<\/strong> to some property of the system. In so doing, it leaves no change in either the system or surroundings. During the reversible process, the system\u2019s entropy<\/strong><\/a><\/b>\u00a0does not increase,<\/strong> and the system is in thermodynamic equilibrium<\/a> with its surroundings. In thermodynamics, an irreversible process<\/strong> is defined as a process that cannot be reversed, which cannot return both the system and the surroundings to their original conditions.<\/p>\n During irreversible process<\/strong> the entropy<\/strong><\/a> of the system increases<\/strong>. A process that eventually returns a system to its initial state is called a cyclic process<\/strong>. After a cycle, all the properties have the same value they had at the beginning. For such a process, the final state<\/strong> is the same as the initial state<\/strong>, so the total internal energy<\/strong><\/a> change must be zero.<\/p>\n It must be noted, according to the second law of thermodynamics<\/a><\/strong>, not all heat provided to a cycle can be transformed into an equal amount of work. Some\u00a0heat rejection<\/strong> must take place.\u00a0The thermal efficiency<\/strong><\/a>, \u03b7<\/em><\/strong>th<\/sub><\/em><\/strong>, of any heat engine as the ratio of the work<\/a> it does, W<\/strong>, to the heat<\/a> input at the high temperature, QH<\/sub>.\u00a0 \u03b7<\/em>th<\/sub><\/em>\u00a0= W\/QH<\/sub><\/strong>.<\/p><\/div><\/div>Types of Thermodynamic Processes<\/h2>\n<\/div><\/div>
Reversible Process<\/h2>\n
Irreversible Process<\/h2>\n<\/p>
Cyclic Process<\/h2>\n<\/p>