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相关概念视频

Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

3.5K
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...
3.5K
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

4.7K
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.
4.7K
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

598
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...
598
Mechanism of heat transfer01:19

Mechanism of heat transfer

1.4K
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...
1.4K
Heat Flow and Specific Heat01:12

Heat Flow and Specific Heat

5.7K
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...
5.7K
Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

1.4K
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...
1.4K

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相关实验视频

Updated: Sep 19, 2025

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
08:25

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

Published on: April 30, 2018

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非经典的热传递和最近的进展

Chuanjin Su1, Huan Wu1, Lingyun Dai1

  • 1School of Engineering and Applied Science, University of California, Los Angeles, Los Angeles, California 90095.

ASME journal of heat and mass transfer
|June 16, 2025
PubMed
概括

探索固体中超越富里埃定律的非经典热传递,包括弹道运输和声子水力学. 了解音声的双重性质是先进材料和热管理应用的关键.

科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术

背景情况:

  • 传统的传热模型,如里埃定律,假设局部平衡和扩散传输.
  • 纳米技术和新材料表现出非经典的传热现象.
  • 这些现象包括弹道运输,声子水力动力学和安德森定位.

研究的目的:

  • 审查在固体中非经典传热方面的最新发现.
  • 为了突出声子的双粒子波性质的重要性.
  • 讨论新兴领域,如合和拓语音.

主要方法:

  • 博尔兹曼运输方程式
  • 分子动力学模拟的模拟.
  • 先进的光谱技术技术的使用.

主要成果:

  • 非经典的传热现象超出了扩散传输的范围.
  • 声的双重性质 (粒子和波形) 对于理解这些现象至关重要.
  • 新的研究领域,如奇拉和拓语音提供先进的语音工程.

结论:

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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

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Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine
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Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine

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相关实验视频

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Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
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Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

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Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine
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Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine

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  • 集成粒子和波模型对于现代材料中复杂的热传输至关重要.
  • 进步使得设计具有量身定制的热性能的材料成为可能.
  • 潜在的应用包括热管理,能源技术和量子科学.