有限時間熱力学熱エンジンの最適化成功と安定性を結びつける

Julian Gonzalez-Ayala^1,2, David Pérez-Gallego^1,2, Alejandro Medina^1,2

¹Department of Applied Physics, Universidad de Salamanca, 37008 Salamanca, Spain.

Entropy (Basel, Switzerland)

|August 28, 2025

まとめ

この研究は,熱エンジンの性能と安定性のダイナミクスを関連付けています. 研究によるとエンジンの安定性によりシステムでは波動下でも最適な性能を実現できます

科学分野:

熱力学について
非均衡システム
複雑なシステム

背景:

エンドリバーシブルなカーノー型熱エンジンは,不可逆性の熱力学過程を研究するためのモデルである.
これらのエンジンの安定性を理解することは性能を最適化し動作を予測するのに不可欠です

研究の目的:

カーノーのような不可逆的な熱エンジンの熱力学的成功と安定性のダイナミクスを結びつける.
安定性がこれらのエンジンの動作と性能にどのように影響するかを調査する.

主な方法:

リバーシブルとディシパティブの限界によって定義された"成功領域"の分析.
エンドリバーシブルモデルに基づく一般的な安定性ダイナミクスの提案.
最大のエコロジックと最大オメガの運用体制の考慮

主要な成果:

端の配置間の距離はカーノートの効率の半分で最小化されます.
安定性ダイナミクスは,単一の波動下で,システムを成功領域に迅速に導きます.
このシステムは,復元ダイナミクスを欠くシステムとは対照的に,ランダムな干渉下で成功領域内に留まります.

結論:

安定ダイナミクスは,成功領域内のエンジン性能を維持するために不可欠です.
安定性により,自然と人工のシステムにとって重要な性能を向上させる状態へと進化します.
この発見は熱力学と複雑なシステムの安定性の相互作用を強調しています

キーワード:

逆転可能な仮説有限時間熱力学熱エンジンの安定性オプティマイズ相対エントロピーストカスティックな波動熱力学的な成功

さらに関連する動画

10:36

Author Spotlight: Optimization of Airflow Velocities in Battery Cooling Systems for Enhanced Thermal Performance and Reduced Energy Consumption

Published on: November 3, 2023

1.7K

14:23

Design and Optimization Strategies of a High-Performance Vented Box

Published on: June 9, 2023

1.2K

関連する概念動画

01:30

The Carnot Cycle

3.1K

Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
What could be the theoretical limit to the efficiency of a heat engine? The...

3.1K

01:10

Heat Engines

3.0K

A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
Whenever we consider heat engines (and associated devices such as refrigerators and heat pumps), we do not use the standard sign convention for heat and work. For convenience, we assume that the symbols Qh, Qc, and W represent only the amounts of heat transferred...

3.0K

01:27

Otto and Diesel Cycle

2.1K

An Otto engine is a four-stroke engine that uses a mixture of gasoline and air as the working fuel. The fuel is injected into the cylinder, and the piston is moved completely down so that the cylinder is at maximum volume. By moving the piston up, adiabatic compression takes place. The spark plug ignites the gasoline-air mixture, and the burning fuel adds heat to the system at a constant volume. The heated mixture expands adiabatically and gets further cooled by exhausting heat, and this cyclic...

2.1K

01:20

The Carnot Cycle and the Second Law of Thermodynamics

2.9K

The Carnot engine works between two heat reservoirs of fixed temperatures. The Carnot cycle begs the following question: Is it possible to devise a heat engine that is more efficient than a Carnot engine between two fixed temperatures? The answer lies in designing a Carnot refrigerator.
Since the individual steps in a Carnot cycle can be reversed, the entire cycle is, thus, reversible. If a Carnot cycle is reversed, it becomes a Carnot refrigerator. It extracts heat Qc from a cold reservoir at...

2.9K

01:15

Statements of the Second Law of Thermodynamics

4.1K

The second law of thermodynamics can be stated in several different ways, and all of them can be shown to imply the others. The Clausius’ statement of the second law of thermodynamics is based on the irreversibility of spontaneous heat flow. It states that heat will not flow from the colder body to the hotter body unless some other process is involved. Additionally, as per the Kelvin’s statement, it is impossible to convert the heat from a single source into work without any other...

4.1K

01:16

Efficiency of The Carnot Cycle

2.8K

The hypothetical Carnot cycle consists of an ideal gas subjected to two isothermal and two adiabatic processes. Since the internal energy of an ideal gas depends only on its temperature, which is the same before and after the completion of the Carnot cycle, there is no change in its internal energy. Hence, using the first law of thermodynamics, the total heat exchanged by the ideal gas equals the total work done. Thus, we can quantify the efficiency of the Carnot cycle via the heat exchanged...