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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...
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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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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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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
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Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
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When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...
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Related Experiment Video

Updated: Jun 10, 2025

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
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Thermal analysis of a reflection mirror by fluid and solid heat transfer method.

Zhen Wang1, Fang Liu1, Chaofan Xue2

  • 1Center for Transformative Science, ShanghaiTech University, 393 Middle Huaxia Road, Shanghai 201210, People's Republic of China.

Journal of Synchrotron Radiation
|October 15, 2024
PubMed
Summary

High-repetition-rate free-electron lasers require precise optics. Thermal analysis of SHINE

Keywords:
finite-element analysisheat fluxheat transferthermal analysiswater cooling

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Area of Science:

  • Optics
  • Thermal Engineering
  • X-ray Science

Background:

  • High-repetition-rate free-electron lasers (XFELs) present thermal challenges for beamline optics.
  • Wavefront preservation is critical for advanced light sources like the Shanghai HIgh-repetition-rate XFEL aNd Extreme light facility (SHINE).

Purpose of the Study:

  • To investigate the thermal field of the first reflection mirror (M1) at the SHINE FEL-II beamline.
  • To understand the impact of thermal load on mirror performance.

Main Methods:

  • Fluid and solid heat transfer analysis was performed.
  • Simulations were conducted for a photon energy of 400 eV.

Main Results:

  • Cooling water outlet temperature increased by 0.15°C.
  • Cooling tube wall temperature rose by a maximum of 0.5°C.
  • Asymmetrical temperature distribution observed on the mirror's footprint centerline.

Conclusions:

  • The study quantifies thermal effects on the M1 mirror at SHINE.
  • Asymmetrical heating can lead to mirror deformation, impacting beam focus and sample interaction.