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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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Mechanisms of Heat Transfer II01:20

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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...
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Thermal Strain01:19

Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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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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Characterization of Thermal Transport in One-dimensional Solid Materials
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Temperature-dependent thermal properties of Ru/C multilayers.

Shuai Yan1, Hui Jiang1, Hua Wang1

  • 1Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Zhangheng Road 239, Pudong District, Shanghai 201204, People's Republic of China.

Journal of Synchrotron Radiation
|September 2, 2017
PubMed
Summary

Ruthenium/Carbon (Ru/C) multilayers show promise for X-ray optics. Their thermal expansion and conductivity were studied after annealing, revealing stability crucial for component applications.

Keywords:
X-rayinterfacemultilayerthermal conductivity

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • X-ray Optics

Background:

  • Ruthenium/Carbon (Ru/C) multilayers are key materials for X-ray optics operating in the 8-20 keV energy range.
  • Understanding the thermal properties of Ru/C multilayers is essential for their application in monochromator and focusing components.
  • Thermal expansion and conductivity are critical parameters influencing the stability and performance of these optical elements.

Purpose of the Study:

  • To investigate the in-situ thermal expansion characteristics of Ru/C multilayers with varying periodic thicknesses (3, 4, and 5 nm).
  • To analyze the effect of annealing temperature (up to 400°C) on the thermal expansion behavior of these multilayers.
  • To measure and compare the thermal conductivity of Ru/C multilayers with their bulk material values.

Main Methods:

  • In-situ grazing-incidence X-ray reflectometry and diffuse scattering were employed to study thermal expansion.
  • The transient hot-wire method was utilized for measuring the thermal conductivity.
  • Multilayers with periodic thicknesses of 3, 4, and 5 nm were subjected to annealing up to 400°C.

Main Results:

  • The study characterized the thermal expansion behavior of Ru/C multilayers as a function of annealing temperature.
  • Thermal conductivity measurements provided insights into the heat transfer properties of the multilayer structures.
  • The results were compared with bulk material values to understand the nanoscale effects.

Conclusions:

  • Ru/C multilayers exhibit specific thermal expansion characteristics influenced by annealing temperature.
  • The thermal conductivity of Ru/C multilayers was quantified and compared to bulk values.
  • These findings are crucial for the design and application of stable Ru/C multilayer optics in X-ray systems.