Finite-time thermodynamics approach to the superconducting transition

Angulo‐Brown, F.; Yépez, E.; Zamorano, R.

doi:10.1016/0375-9601(93)90601-u

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…Another wide class of applications deals with the cooling of heat generating electric components that must operate at a certain temperature. Examples are the superconducting transition, 37 superconducting windings for stationary magnets and rotating machines, [38][39][40] and electronic packages in computers. 41,42 Another class of engineering components that has been optimized based on the irreversibility minimization principles ͑6͒-͑10͒ is the counterflow heat exchangers that connect the coldest regions of refrigerators and liquefiers to the room temperature compressor.…”

Section: ͑10͒mentioning

confidence: 99%

Entropy generation minimization: The new thermodynamics of finite-size devices and finite-time processes

Bejan

1996

Journal of Applied Physics

1,667

605

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Entropy generation minimization (finite time thermodynamics, or thermodynamic optimization) is the method that combines into simple models the most basic concepts of heat transfer, fluid mechanics, and thermodynamics. These simple models are used in the optimization of real (irreversible) devices and processes, subject to finite-size and finite-time constraints. The review traces the development and adoption of the method in several sectors of mainstream thermal engineering and science: cryogenics, heat transfer, education, storage systems, solar power plants, nuclear and fossil power plants, and refrigerators. Emphasis is placed on the fundamental and technological importance of the optimization method and its results, the pedagogical merits of the method, and the chronological development of the field.

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Section: ͑10͒mentioning

confidence: 99%

Entropy generation minimization: The new thermodynamics of finite-size devices and finite-time processes

Bejan

1996

Journal of Applied Physics

1,667

605

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“…conforms to an electrodynamic, quantum, and thermal set of physical phenomena of great interest by themselves [1][2][3][4]. A great amount of new fundamental physics has been extracted experimentally and theoretically since its discovery in 1911 by Onnes [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. They have, also, the potential to be one clean energy source that technology is looking for.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity and Microwaves

Zamorano¹

2020

On the Properties of Novel Superconductors

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Superconductivity conforms to a quantum, thermal, and electrodynamic set of physical phenomena of great interest by themselves. They have, also, the potential to be one clean energy source that technology is looking for. Superconductors do not allow static magnetic fields to penetrate them below a critical field, that is, Meissner effect. However, microwave magnetic fields do penetrate them already, and their energy is readily absorbed by the superconductor. High-temperature, perovskite superconductors do absorb microwave energy the most due to the presence of unpaired electron spins, fluxoid dynamics, and quasiparticle motion. We describe the fundamental physics of the interaction of the superconductors with microwaves. Experimental techniques to measure microwave absorption are presented. Experimental setups for absorption of energy are described in terms of the central quantity, Q. The measurements are analyzed in terms of irreversible energy exchange processes. The knowledge gained can inform the design of superconducting devices operating in microwave environments.

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“…These models consist of a class of irreversible heat engines where their whole entropy production is ascribed only to the coupling between the working substance and its surroundings and it is permitted that the working fluid undergoes only reversible transformations. By means of this approach it has been possible to obtain successful models and optimizations of real heat engines. − The ET scope has been extended beyond the ordinary heat engines, such as occurred with the early thermodynamics in the past century. − In particular, Ondrechen et al, , De Vos, , and Gordon et al , extended the endoreversibility concept toward chemical engines, i.e., engines that convert differences in chemical potential into work. These engines are the analogues of heat engines driving heat transfer for producing work from temperature differences.…”

Section: Introductionmentioning

confidence: 99%

“…These engines are the analogues of heat engines driving heat transfer for producing work from temperature differences. In ref another ET extension was introduced. In that paper the superconducting transition was analyzed by means of the so-called method of Carnot cycles (MCC) 11 in a finite-time thermodynamics context, obtaining a generalized Rutgers' relation for the finite discontinuity of the specific heat at the superconducting critical temperature.…”

Section: Introductionmentioning

confidence: 99%

van't Hoff's Equation for Endoreversible Chemical Reactions

Angulo‐Brown

Arias-Hernandez

1996

J. Phys. Chem.

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We propose that the so-called van't Hoff's equation for the enthalpy changes in a chemical reaction may be modified in the context of endoreversible thermodynamics. This modification takes into account the role played by the heat supplied by the thermal bath for maintaining constant the temperature of the chemical system. We analyze the reaction of hydrogen iodide synthesis by means of the modified van't Hoff's equation.

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Finite-time thermodynamics approach to the superconducting transition

Cited by 7 publications

References 15 publications

Entropy generation minimization: The new thermodynamics of finite-size devices and finite-time processes

Entropy generation minimization: The new thermodynamics of finite-size devices and finite-time processes

Superconductivity and Microwaves

van't Hoff's Equation for Endoreversible Chemical Reactions

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