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相关概念视频

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 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...
297
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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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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Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

173
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
173
Thermal Stress01:09

Thermal Stress

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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相关实验视频

Updated: Jun 18, 2025

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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剪切热量效应增强了用于固态冷却的聚合物复合材料中的弹性热量反应.

Shixian Zhang1,2, Yuheng Fu1, Xinxing Nie1

  • 1State Key Laboratory of Silicate Materials for Architectures, and School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, China.

Nature communications
|August 2, 2024
PubMed
概括

研究人员使用聚合物纳米复合材料增强了弹性热量冷却. 添加纳米填充剂增加了,导致高效固态制冷替代品的显著温度变化.

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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

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相关实验视频

Last Updated: Jun 18, 2025

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
11:11

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Published on: May 2, 2016

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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
09:32

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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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科学领域:

  • 材料科学 材料科学 材料科学
  • 热力学是一种热力学.
  • 可持续能源 可持续能源

背景情况:

  • 弹性热量冷却为传统制冷提供了一个绿色的替代方案.
  • 目前的弹性高热聚合物在和变形方面存在局限性,阻碍了性能.

研究的目的:

  • 为了增强聚合物的弹性热效应.
  • 开发高性能固态冷却材料和设备.

主要方法:

  • 在elastocaloric聚合物中加入无机纳米填充剂.
  • 研究通过分子链剪切增强贡献的机制.
  • 一个大变形冷却系统的演示.

主要成果:

  • 实现了 -18.0 K 的亚亚巴特温度变化.
  • 记录了一个异热变化为187.4 J kg-1 K-1.1.
  • 演示了56.3%的工作恢复效率的冷却系统.

结论:

  • 纳米填充剂的添加显著改善了聚合物中的弹性热量性能.
  • 与现有材料相比,开发的聚合物纳米复合材料显示出优越的热量反应.
  • 这项研究为先进的弹性热聚合物和固态冷却原型铺平了道路.