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Mesoscopic Non-Equilibrium Thermodynamics Part 11

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Tham khảo tài liệu 'mesoscopic non-equilibrium thermodynamics part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Thermodynamics of Thermoelectricity 291 Fig. 6. Reduce Efficiency. factor gives an insight of the sensibility of the thermoelectric system to varying working conditions. It shows that for large ZT this sensibility becomes very high and strong reduction of the efficiency can rapidly occur. For an optimal efficiency obtained for u s it shows that precises the intrinsic irreversibilities contribution for a given material. 7. Conclusion The thermoelectric process has been described using a classical fluid approach. The Fermi gas of electrons takes place of the traditional steam in the thermodynamical cycle giving strong similarities in the description of the underlying mechanismes which are based on the linear Onsager theory of out of equilibrium thermodynamics . It is shown that the so called figure of merit ZT of the thermoelectric material can be directly derived from this approach. Finally the importance of the working conditions is demonstrated leading to the concept of thermoelectric potential which is an extension of the concept of free energy for the gas under out of equilibrium conditions. 8. References Callen 1952 Herbert B. Callen and Richard F. Greene Phys Rev 86 5 702-710 1952 . Callen 1954 Callen H. B. Irreversible thermodynamics of thermoelectricity Rev. Mod. Phys. 26 237 1954. Callen 1948 Herbert B. Callen Phys Rev 73 11 1349-1358 1948 . Domenicali 1954 C.A. Domenicali Rev. Mod. Phys. 26 237-275 1954 . Goupil 2009 C. Goupil J. Appl. Phys. 106 104907 2009 . 5 Greene 1952 Richard F. Greene and Herbert B. Callen Phys Rev 88 6 1387-1391 1952 . Ioffe 1960 A.F. Ioffe Physics of Semiconductors Infosearch London 1960 Landau 1984 L. D. Landau and E. M. Lifshitz Electrodynamics of Continuous Media 2nd Edition Butterworth Heinemann Oxford 1984 . Onsager 1931a L. Onsager Phys. Rev. 37 405 - 426 1931 . Onsager 1931b L. Onsager Phys. Rev. 38 2265 - 2279 1931 . Peltier 1834 Peltier J. C. A. Nouvelles experiences sur la caloricite des courants electrique Ann. Chem. .