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相关概念视频

Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
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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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Heat Flow and Specific Heat01:12

Heat Flow and Specific Heat

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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...
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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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Specific Heat01:16

Specific Heat

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The specific heat capacity of a substance refers to the energy required to increase the temperature of one gram of that substance by one degree Celcius. Specific heat capacity is often represented in calories (cal), grams (g), and degrees Celsius (oC), but can also be expressed in joules (J), kilograms (kg), and Kelvin (K), among other units.
For example, increasing the temperature of one gram of water by 1°C requires one calorie of heat energy and can be written as 1 cal/g-°C, or...
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相关实验视频

Updated: Jan 13, 2026

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

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基于显式欧勒法用于非静止的导热模型.

Attila Érchegyi1,2, Ervin Rácz3

  • 1Doctoral School of Applied Informatics and Applied Mathematics, Obuda University, 1034 Budapest, Hungary.

Entropy (Basel, Switzerland)
|October 28, 2025
PubMed
概括
此摘要是机器生成的。

这项研究通过引入一个无波动值来防止温度振荡,优化了明确的欧勒导热方法. 可变的网格距离和这个新的值提高了模拟的准确性和稳定性.

关键词:
这就是Flexblue的特点.没有波动的门.一个明确的欧勒方案.有限差方法的方法是有限差的.网格优化优化 网格优化小型模块化反应堆小型模块化反应堆热扩散是一种热扩散.短暂的传热传导 短暂的传热传导

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Characterization of Thermal Transport in One-dimensional Solid Materials
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相关实验视频

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科学领域:

  • 计算式热传输是一种热传输技术.
  • 工程中的数值方法.
  • 热力工程是热力工程中的一个.

背景情况:

  • 显式欧勒法在过渡热传导模拟中容易发生振荡.
  • 经典的库兰特-弗里德里希斯-莱维 (CFL) 条件对于单调的温度近似来说是不够的.
  • 在中间状态中的振荡可能导致不准确的热模型.

研究的目的:

  • 为热传导模型优化显式欧勒法.
  • 为了消除短暂温度模拟中的振荡.
  • 开发一种更稳定,更准确的热分析数值方法.

主要方法:

  • 引入了福里埃数 (K) 的无波动值,比CFL更严格.
  • 使用等式系数方法确定最佳时间 (Δt) 和空间 (Δx) 步骤.
  • 使用不等式系统和指定元素厚度 (Δξ) 构建变量网格间距 (M2).

主要成果:

  • 无波动值确保了单调的温度-时间演变.
  • 可变的网格距离 (M2) 与无波动值相结合,提高了模拟的准确性.
  • 对Flexblue® SMR关闭场景的应用显示,与均电网 (M1) 相比,M2中的温度梯度预测得到了改进.

结论:

  • 优化的显式欧勒法具有无波动值和可变的网格间距,为传热提供了卓越的精度.
  • 这种方法有效地减轻了振荡,并提高了短暂热模拟的稳定性.
  • 这些发现得到了现实的紧急关机场景的验证,证明了其实际适用性.