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01:20Mechanisms 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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01:14Mechanisms 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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01:14Mechanisms 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...
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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基于离子-液体的纳米流体及其传热应用:全面审查
1Department of Mechanical Engineering, College of Engineering, Prince Mohammad Bin Fahd University, P.O. Box 1664, Al-Khobar, 31952, Saudi Arabia.
Chemphyschem : a European journal of chemical physics and physical chemistry
|September 18, 2023
概括
离子液体 (ILs) 和IL纳米流体由于其优越的热物理特性,显示出作为先进的传热流体的前景. 本综述总结了它们在热器件中的特性和应用.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 热力学是一种热力学.
背景情况:
- 离子液体 (ILs) 具有优良的热物理特性,如高离子导电性,低蒸汽压力和热稳定性,使其适用于传热应用.
- 在IL中分散的纳米粒子可以进一步增强它们的热物理特性和热性能,产生IL纳米流体.
- 对IL纳米流体的研究是一个新兴的领域,专注于改善热设备中的传热率.
研究的目的:
- 要总结最近关于利用离子液态纳米流体 (IL纳米流体) 作为传热流体的研究.
- 提供基础离子液体和IL纳米流体的热物理性质的全面概述.
- 涵盖IL纳米流体的合成方法和测量技术,并建议未来的研究方向.
主要方法:
- 文献综述和对IL纳米流体现有研究的综合.
- 热物理性质的分析,包括导热率,粘度,密度和比热.
- 关于IL纳米流体在各种热器件中的应用数据的汇编.
主要成果:
- 离子液体在传热应用中表现出有利的热物理特性.
- 与基础IL相比,IL纳米流体显示出增强的导热率和传热率.
- 报道了IL纳米流体的各种合成方法和表征技术.
结论:
- IL纳米流体代表了具有可调节性质的先进传热流体的一个有前途的类别.
- 需要进一步的研究来优化IL纳米流体的合成,表征和应用.
- IL纳米流体具有提高热管理系统效率的巨大潜力.