文档介绍：EntropyandTheSecondLawofThermodynamics熵与热力学第二定律主讲:张金翠Tel:85953720**********E-mail:******@EntropyandTheSecondLawofThermodynamics熵与热力学第二定律§3-1概述§3-2热过程的不可逆性§3-3可逆过程§3-4热力学第二定律的几种表述§3-5卡诺定理§3-6热力学温度标尺(自学)§3-7卡诺循环§3-8克劳修斯不等式§3-9状态参数熵§3-10孤立系统熵增原理§3-11熵方程§3-12热力系的有效能§3-1Introduction概述Fourexamples:QQ?Introduction概述Thereverseprocessesallsatisfiesthefirstlaw,:1、urinacertaindirection,、Weneedanothergeneralprinciple——thesecondlawofthermodynamics判断热过程能否进行,阐明热过程进行的方向、条件及限制§3-2Irreversibilitiesofthermalprocesses热过程的不可逆性一、Sometypicalprocesses几个典型的过程(a)Frictionprocess摩擦过程(b)Heattransferthroughafinitetemperaturedifference不等温传热(c)Unrestrainedexpansionofagas无限膨胀(d)Mixingprocess混合过程SomerepresentativeprocessesT1T2T1>T2Q真空•••••••••••••••••••••••••••••★★★★★★★★★★★★★★(a)(b)(c)(d)§3-2Irreversibilitiesofthermalprocesses热过程的不可逆性二、irreversibleprocesses不可逆过程1、Definition定义:2、Irreversiblefactors不可逆因素::摩阻,电阻,非弹性变性,磁阻等Unbalancedpotentials不平衡势差Dissipativeeffects(耗散效应)ReviewT1T2T1>T2Q真空•••••••••••••••••••••••••••••★★★★★★★★★★★★★★(a)(b)(c)(d)moncharacteristics:urinacertaindirection,notinthereversedirectionirreversibleprocessesthesecondlawofthermodynamicsProcessesthatarenotreversiblearecalledirreversibleprocesses.?