在一维复合链中非异常热传输
1ISAC-CNR and Istituto Nazionale di Fisica Nucleare, Section Cagliari, I-09042 Monserrato, Italy.
Physical review. E
|July 19, 2023
概括
在翻译不变系统中的异常热传输可以过渡到正常扩散. 这项研究提出了一个新的机制,在这个新的机制中,过渡尺度可能会有分歧,解释了像合转子链这样的系统中的扩散运输.
科学领域:
- 物理 物理学 物理
- 凝聚物质物理学 凝聚物质物理学
- 统计力学 统计力学
背景情况:
- 转换不变的低维系统经常表现出异常的热传输.
- 合转子链是一个例子,其中翻译不变性不会导致异常运输.
- 在此类系统中,以前对正常扩散的解释涉及缺乏全球伸展变量动态.
研究的目的:
- 为过渡到异常热传输提出一个替代机制.
- 调查尺度在过渡到异常热传输中的作用.
- 分析一个复合链模型,展示既保留量和富里埃定律.
主要方法:
- 复合链模型的分析研究.
- 对能量和动量保存定律的分析.
- 检查连续极限和静止温度配置文件.
主要成果:
- 提出了一种机制,在这种机制中,过渡尺度到异常热传输的过渡尺度可以分离.
- 复合链模型保留了本地能量,动量和全球延伸.
- 该模型在连续极限中服从富里埃定律.
- 分析结果显示,消失和有限弹性的线性静止温度概况.
结论:
- 拟议的机制为从异常热传输向正常热传输的过渡提供了新的视角.
- 规模依赖的过渡,可能与不同的尺度,可以解释在翻译不变系统的扩散运输.
- 复合链模型作为一个分析示例来证明这些原则.
相关概念视频
01:14Mechanisms of Heat Transfer I
4.3K
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.
4.3K
01:14Mechanisms of Heat Transfer
372
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...
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...
372
01:20Mechanisms of Heat Transfer II
3.3K
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...
3.3K
01:19Mechanism of heat transfer
1.2K
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...
1.2K
01:12Heat Flow and Specific Heat
5.5K
Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
5.5K
01:25Heat Capacities of an Ideal Gas III
2.2K
The number of independent ways a gas molecule can move along straight line, rotate, and vibrate is called its degrees of freedom. Supposing d represents the number of degrees of freedom of an ideal gas, the molar heat capacity at constant volume of an ideal gas in terms of d is
2.2K