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相关概念视频

Specific Heat01:16

Specific Heat

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 4186 J/kg/K.
Mechanism of heat transfer01:19

Mechanism of heat transfer

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...
Thermal Stress01:09

Thermal Stress

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...
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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.
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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...
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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 heat.

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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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以Cocklebur为灵感的坚固不易燃聚合物热导体用于CPU冷却.

Yongbin Wang1, Yong Fan1, Kaichao Pan1

  • 1School of Materials Science and Engineering, Tongji University, Shanghai, 201804, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)
|December 18, 2024
PubMed
概括
此摘要是机器生成的。

灵感来自cocklebur的新聚合物复合材料为高效的计算机芯片冷却提供了增强的导热性和机械强度. 这些材料为电子和新能源应用提供了可持续的解决方案.

关键词:
处理器冷却的CPU冷却卡克尔伯格的子机械性质 机械性质 机械性质刺-种子-树皮-树皮导热率 导热率 导热率 导热率 导热率 导热率

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 纳米技术纳米技术

背景情况:

  • 高效的散热对于中央处理单元 (CPU) 来说至关重要,需要先进的基于聚合物的热接口材料.
  • 现有的高导热性聚合物通常面临机械强度,成本,界面电阻和可燃性方面的限制.

研究的目的:

  • 开发用于CPU冷却应用的新型聚合物复合材料,以提高热导率和机械性能.
  • 模仿的自然结构,以提高材料的性能和功能.

主要方法:

  • 开发造聚氨 (PUC) 复合材料,使用铜乙烯基胺甲基酸作为"棘"和功能化的微球作为"种子".
  • 采用3D"棘-种子-皮"结构设计,灵感来自子,以实现协同效应.
  • 机械强度,导热率和自灭特性的表征.

主要成果:

  • 开发的PUC复合材料具有15.9MPa的抗拉强度和2.51W m-1K-1.1的热导率.
  • 独特的结构防止有机的自我聚合,赋予自我灭的特性,提高机械和热性能.
  • 优化粒子互锁和降低界面热阻有助于优越的导热性.

结论:

  • 灵感来自cocklebur的PUC复合材料为有效的CPU散热提供了一个有前途的解决方案,满足高热导电性和机械强度的需求.
  • 这些材料为先进的电子和新能源行业提供了低密度,可持续和成本效益的替代品.