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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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Mechanism of heat transfer01:19

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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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Joule-Thomson Effect01:21

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The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
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Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

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Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
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Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
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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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Updated: Apr 27, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
09:10

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

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General bidirectional thermal characterization via the 3ω technique.

Matthew L Bauer1, Pamela M Norris1

  • 1Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, USA.

The Review of Scientific Instruments
|July 3, 2014
PubMed
Summary
This summary is machine-generated.

This study presents a novel bidirectional 3ω method to measure thermophysical properties, overcoming fabrication challenges. The new system accurately determines thermal conductivity, heat capacity, and contact resistance under varying pressures.

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Area of Science:

  • Materials Science
  • Thermal Physics
  • Nanotechnology

Background:

  • The 3ω technique is widely used for thermophysical property determination.
  • Fabricating thin metal lines on samples presents challenges for certain materials.

Purpose of the Study:

  • To develop an alternative 3ω experimental geometry to circumvent fabrication issues.
  • To create a thermal mount optimizing sensitivity to thermal conductivity, heat capacity, and contact resistance.
  • To demonstrate a system for measuring thermophysical properties under varying axial pressure.

Main Methods:

  • A bidirectional experimental geometry utilizing contact resistance was employed.
  • A specialized thermal mount was designed and fabricated.
  • A general thermal model was developed and applied to analyze experimental data.

Main Results:

  • The bidirectional system successfully measured thermophysical properties.
  • The thermal mount design enhanced sensitivity to key parameters.
  • Data collection under varying axial pressures was demonstrated as feasible.

Conclusions:

  • The bidirectional 3ω technique offers a viable alternative for materials where traditional methods fail.
  • The developed system and thermal model provide a versatile platform for thermophysical property analysis.
  • Axial pressure significantly influences contact resistance and overall measurement accuracy.