摘要
分别用经典热力学和非平衡态热力学方法证实在交叉现象中,首先由于一种强度量差的作用产生另一种强度量差,其次才有了对应广延量的流动。在磁热效应中,磁场的变化首先通过磁矩的变化产生温度的变化,只有温度的变化才能引起熵和热量的流动。在温差电效应中,温度差首先通过熵的变化产生电势差,有了电势差才有了电荷的流动。得出研究交叉现象的关键是寻找强度量之间的关系;给出研究交叉现象的方法,即传递公理与热力学分析相结合分析交叉现象。
According to energy postulate,any form of energy can be expressed with a pair of conjugate basic intensive property and extensive property. Transfer postulate states that the transfer and conversion of energy inherently accompany that of the basic extensive property, which is caused by the gradient of the conjugate intensive property. Any other kinds of intensive property can only affect the transfer through its conjugate extensive property. With the classic thermodynamic and non-equilibrium thermodynamic methods ,it was proved that,in the cross effect,one form of intensive property first generates the other form of intensive property through its conjugate extensive property,and then there can be a flow of the other form of extensive property. In the magneto-caloric effect, the change in magnetic field ~irst causes the change in temperature through magnetic moment ,thereafter there is flow of entropy and heat acted by the change in temperature. While in the thermoelectricity effect,the difference of temperature first causes the difference of electric potential through entropy, only after that there is electric current driven by the electric potential difference. One conclusion is that the key idea of studying cross effect is to find out the relationship between different intensive properties ,and the method to combine transfer postulate with thermodynamic analysis.
出处
《广西师范大学学报（自然科学版）》
CAS
北大核心
2008年第4期10-13,共4页
Journal of Guangxi Normal University:Natural Science Edition
基金
国家重点基础研究发展规划资助项目(G2000026307)
广东省科技计划项目资助课题(2007A050100025)
关键词
能量公理
传递公理
交叉现象
温差电效应
磁热效应
energy postulate
transfer postulate
cross-effect
magneto-caloric effect
thermoelectric effect
