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相关概念视频

Heat Engines01:10

Heat Engines

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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...
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The Carnot Cycle01:30

The Carnot Cycle

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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...
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Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
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Mechanism of heat transfer01:19

Mechanism of heat transfer

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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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相关实验视频

Updated: Jan 9, 2026

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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极端温度单粒子热发动机 极端温度单粒子热发动机

M Message1, F Cerisola2, J D Pritchett1

  • 1King's College London, Department of Physics, Strand, London WC2R 2LS, United Kingdom.

Physical review letters
|December 5, 2025
PubMed
概括
此摘要是机器生成的。

科学家们创造了一种新型发动机,在超过10兆卡尔文的极端温度下运行. 该发动机展示了巨大的波动和独特的效率事件,为基本热力学过程提供了洞察力.

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相关实验视频

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Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System
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科学领域:

  • 热力学是一种热力学.
  • 统计物理 统计物理
  • 微尺度工程 微尺度工程

背景情况:

  • 研究自然界中的异国情调热力学过程是具有挑战性的.
  • 极端条件对于理解基本的物理极限至关重要.

研究的目的:

  • 为探索极端热力学创造一个可控制的环境.
  • 为了研究微型发动机在极端温度下的行为.

主要方法:

  • 在真空中利用带电微粒的电升起合成了一个结构化的环境.
  • 在高于10兆卡尔文的温度下运行低压发动机.
  • 理论上模拟了乘数噪声对粒子扩散的影响.

主要成果:

  • 观察到热交换中的巨大波动.
  • 记录了工作输出超过热量输入的随机效率事件.
  • 由于环境不均,证明了取决于位置的扩散.

结论:

  • 合成环境能够有效地研究极端热力学过程.
  • 发动机表现出独特的行为,包括效率异常和位置依赖扩散.
  • 理论模型准确地预测了观察到的现象,验证了实验设置.