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01:20Mechanisms 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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01:14Mechanisms 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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01:14Mechanisms 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.
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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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01:23Heat Capacities of an Ideal Gas II
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01:19Mechanism of heat transfer
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基于迪克模型的通用量子奥托热机.
He-Guang Xu1, Jiasen Jin1, G D M Neto2
1School of Physics, Dalian University of Technology, 116024 Dalian, China.
Physical review. E
|February 17, 2024
概括
研究人员使用量子比特和玻色子场开发了一个通用量子热机 (UQHM). 这种量子引擎可以充当发动机,冰箱,加热器或加速器,其性能在相位过渡附近得到了增强.
科学领域:
- 量子热力学就是量子热力学.
- 量子信息科学是一种量子信息科学.
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 量子热机提供了利用量子现象进行能量转换的新方法.
- 狄克模型描述了相互作用的量子系统,这对于理解集体效应很重要.
研究的目的:
- 研究在开放的迪克模型中使用与玻色子场合的N量子比特创建通用量子热机 (UQHM).
- 通过控制系统参数来分析机器作为发动机,冰箱,加热器或加速器的功能.
主要方法:
- 模拟一个量子奥托热机器,其中N个量子比特与玻色子场和容器相互作用 (开放的迪克模型).
- 计算热量和工作交换,考虑原子数,合模式和储温度比.
- 分析量子特征,如纠和二次相关性.
主要成果:
- 证明了UQHM在多种模式 (发动机,冰箱,加热器,加速器) 中运行的能力.
- 证明量子资源 (纠,相关性) 不会影响UQHM的效率或性能.
- 鉴定了Dikke模型相变参数临界值附近的提高效率和性能.
结论:
- 使用开放的迪克模型可以实现通用量子热机.
