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Dissertations / Theses on the topic 'Finite-time thermodynamics'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

K, Manikandan Sreekanth. "Finite-time non-equilibrium thermodynamics of a colloidal particle." Licentiate thesis, Stockholms universitet, Fysikum, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-155316.

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In this thesis we have thermodynamically characterized finite time processes performed on a colloidal particle, kept in contact with thermal reservoir(s). Thermodynamic processes are implemented on the colloidal particle by systematically changing the confining potential in a time dependent way, according to an external driving protocol or by controlling the environmental conditions over a finite duration. First, we study two externally driven systems: one in which the driving is deterministic, and another where the driving is stochastic. These models have appeared in the literature as the bui

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2

Schneider, Thomas. "An experimental investigation of the finite time efficiency of a Peltier refrigeration device." PDXScholar, 1991. https://pdxscholar.library.pdx.edu/open_access_etds/4261.

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Since the need of energy conservation has become more and more urgent in the past decades, there has been an increased interest in the study and development of more efficient energy conversion systems. One of the fields that have arisen from that endeavor is a branch of physics called Finite Time Thermodynamics (FIT). It may be said that FIT was initiated through the famous paper by Curzon and Ahlborn (1975) that established new bounds on the efficiency of a finite time Carnot heat engine. Before, the traditional treatments gave a fundamental upper limit on the efficiency of any heat engine. H

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3

Walters, Joseph D. "Optimization and Thermodynamic Performance Measures of a Class of Finite Time Thermodynamic Cycles." PDXScholar, 1990. https://pdxscholar.library.pdx.edu/open_access_etds/1186.

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Modifications to the quasistatic Carnot cycle are developed in order to formulate improved theoretical bounds on the thermal efficiency of certain refrigeration cycles that produce finite cooling power. The modified refrigeration cycle is based on the idealized endoreversible finite time cycle. Two of the four cycle branches are reversible adiabats, and the other two are the high and low temperature branches along which finite heat fluxes couple the refrigeration cycle with external heat reservoirs. This finite time model has been used to obtain the following results: First, the performance of

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4

Humphrey, Tammy Ellen Physics Faculty of Science UNSW. "Mesoscopic quantum ratchets and the thermodynamics of energy selective electron heat engines." Awarded by:University of New South Wales. Physics, 2003. http://handle.unsw.edu.au/1959.4/19186.

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A ratchet is an asymmetric, non-equilibrated system that can produce a directed current of particles without the need for macroscopic potential gradients. In rocked quantum electron ratchets, tunnelling and wave-reflection can induce reversals in the direction of the net current as a function of system parameters. An asymmetric quantum point contact in a GaAs/GaAlAs heterostructure has been studied experimentally as a realisation of a quantum electron ratchet. A Landauer model predicts reversals in the direction of the net current as a function of temperature, amplitude of the rocking voltage,

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5

Apertet, Yann. "Réflexions sur l’optimisation thermodynamique des générateurs thermoélectriques." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112322/document.

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Les phénomènes thermoélectriques sont un moyen de convertir directement l’énergie thermique en énergie électrique ; ils sont à ce titre au cœur de nombreuses recherches dans le domaine de l’énergétique. Au-delà de l’optimisation des matériaux constituants les générateurs thermoélectriques, il est également nécessaire de mener une réflexion sur la manière dont ces générateurs sont utilisés. La contribution des contacts thermiques entre le générateur et les réservoirs thermiques est un facteur qui va modifier les conditions de fonctionnement optimales du générateur. En utilisant la notion de cou

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6

Boldt, Frank. "A Framework for Modeling Irreversible Processes Based on the Casimir Companion." Doctoral thesis, Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-145179.

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Thermodynamic processes in finite time are in general irreversible. But there are chances to avoid irreversibility. For instance, there are canonical ensembles of special quantum systems with a given probability distribution describing the likelihood to find the system at time t=0 in a particular state with energy E_i(0), which can be controlled in a specific way, such that the initial probability distribution is recovered at the end of the process (t=T), but the state energies did change, hence E_i(0) is not equal to E_i(T). This allows to change thermodynamic quantities (expectation values)

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7

Beckstein, Pascal. "Methodenentwicklung zur Simulation von Strömungen mit freier Oberfläche unter dem Einfluss elektromagnetischer Wechselfelder." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-232474.

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Im Bereich der industriellen Metallurgie und Kristallzüchtung treten bei zahlreichen Anwendungen, wo magnetische Wechselfelder zur induktiven Beeinflussung von leitfähigen Werkstoffen eingesetzt werden, auch Strömungen mit freier Oberfläche auf. Das Anwendungsspektrum reicht dabei vom einfachen Aufschmelzen eines Metalls in einem offenen Tiegel bis hin zur vollständigen Levitation. Auch der sogenannte RGS-Prozess, ein substratbasiertes Kristallisationsverfahren zur Herstellung siliziumbasierter Dünnschichtmaterialien, ist dafür ein Beispiel. Um bei solchen Prozessen die Interaktion von Magnetf

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8

Cheng, Ching-Yang, and 鄭慶陽. "Applications of finite-time thermodynamics in thermodynamic cycles." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/15497210648904347515.

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博士<br>國立成功大學<br>機械工程研究所<br>84<br>In this study, a steady-flow approach in finite-time thermo- dynamics has been used to study on the performance optimizations of heat engines and heat pumps from the viewpoints of various ob- jective functions. The topics studied include: (1) ecological- criterion-function optimizations of endoreversible Brayton heat engines with isothermal heat sources, (2) power optimiztions of endoreversible regenerative Brayton heat engines with isothermal heat sources,

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9

Qiu, Jian-Ying, and 邱建穎. "Analyses on Impinging Heat Transfer and Finite-Time Thermodynamics." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/u5ncgm.

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碩士<br>崑山科技大學<br>機械工程研究所<br>91<br>First, the flow and heat transfer characteristics of an impinging laminar slot-jet, twin impinging laminar slot-jets, and heat sinks with sloped plate fins as well as with an inclined confinement surface are investigated by using the Star-CD software. Parameters examined for a single jet include the width of the jet, Reynolds number, the separation distance between the slot-jet exit plane and the impingement surface, free-jet impingement or semiconfined-jet impingement, uniform inlet flow or fully-developed inlet flow. An additional parameter, the separation di

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10

Wei-ChingYeh and 葉蔚青. "Maximum Power Output Analysis of Finite-Time Thermodynamics Stirling Engine." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/04816570316678015078.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>98<br>This study present finite time thermodynamic analysis of Stirling heat engine and obtained the maximum power output by using Genetic Algorithm (GA). The thermodynamic models include an endoreversible Stirling engine and an irreversible Stirling engine with imperfect regeneration and heat loss. Each one of those models has two cases which respectively are heat source by convection transfer and by radiation transfer. The relationship between maximum power output and thermal efficiency, moreover, the optimum working temperature of working fluid can be obtained.

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11

Su, Yih-Feng, and 蘇益豐. "Application of Finite-Time Thermodynamics and Exergy Method to Refrigeration Systems." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/47086220575086026628.

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博士<br>國立成功大學<br>機械工程學系碩博士班<br>93<br>Abstract 　Exergetic efficiency optimization that combines finite-time thermodynamics theory and exergy concept has been applied to an irreversible Carnot refrigeration system, an irreversible Brayton refrigeration system, an irreversible inter-cooled refrigeration system and a two-stage irreversible combined refrigeration system. Multi- irreversiblities considered in these systems include finite rate heat transfer, internal dissipation of the working fluid and heat leak between heat reservoirs. Exergetic efficiency defined as the ratio of rate of exergy outp

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12

Lee, Jhe-Yu, and 李哲宇. "Finite Time Endoreversible Maximum Useful Energy Rate Analysis of Thermodynamics Cogeneration Cycles." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/96043388790477154956.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>97<br>In this study, the finite-time thermodynamics method has been utilized on the performance optimization of cogeneration cycles. By using the total useful energy rate method to study the power and the useful heat output in a steady-state-flow system had been investigated. The research includes endoreversible Otto cogeneration cycle, endoreversible Atkinson cogeneration cycle, and internal irreversible Joule-Brayton cogeneration cycle. If the total useful energy-rate is an objective function on optimization, the total useful energy rate of the cycle is maximiz

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13

Ren-JieHung and 洪仁傑. "Maximum Power Output Analysis of Internal Combustion Heat Engine with Finite-Time Thermodynamics." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/01218710780422743295.

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14

Liu, Jian-Zhi, and 劉建志. "Finite-time-thermodynamic analysis of refrigerating cycles." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/39650182443619329904.

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15

Lee, Kuei-Peng, and 李魁鵬. "The finite-time thermodynamic analysis of refrigeration cycles with inter-cooling." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/13105760942661086082.

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16

Meng-Hsiu, Hsieh, and 謝孟修. "Finite-time thermodynamic analysis of the recuperative gas turbine cycle using intelligent computer design software." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/69472354640026806605.

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碩士<br>國立高雄海洋科技大學<br>輪機工程研究所<br>98<br>In this paper, the viewpoint of finite-time thermodynamics theory and classical thermodynamics has been applied to analyze the irreversible alternative recuperative cycle (ARC), which is taken to compare with the conventional recuperative cycle (CRC).By considering the cycle to interact with the hot side and cold side of heat exchangers and the regenerator in different distributions of heat conductance and different rates of thermal capacity, the results of optimization of the maximum power out and cycle efficiency of the gas turbine regeneration cycle are

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17

Beckstein, Pascal. "Methodenentwicklung zur Simulation von Strömungen mit freier Oberfläche unter dem Einfluss elektromagnetischer Wechselfelder." Doctoral thesis, 2017. https://tud.qucosa.de/id/qucosa%3A30749.

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Im Bereich der industriellen Metallurgie und Kristallzüchtung treten bei zahlreichen Anwendungen, wo magnetische Wechselfelder zur induktiven Beeinflussung von leitfähigen Werkstoffen eingesetzt werden, auch Strömungen mit freier Oberfläche auf. Das Anwendungsspektrum reicht dabei vom einfachen Aufschmelzen eines Metalls in einem offenen Tiegel bis hin zur vollständigen Levitation. Auch der sogenannte RGS-Prozess, ein substratbasiertes Kristallisationsverfahren zur Herstellung siliziumbasierter Dünnschichtmaterialien, ist dafür ein Beispiel. Um bei solchen Prozessen die Interaktion von Magnetf

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