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Mechanisms of Heat Transfer I

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.

Thermal Strain

Thermal Strain

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...

Mechanisms of Heat Transfer II

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...

Thermal Expansion

Thermal Expansion

The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...

Joule-Thomson Effect

Joule-Thomson Effect

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...

Thermodynamic Potentials

Thermodynamic Potentials

Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four important thermodynamic potentials are internal energy, enthalpy, Helmholtz free energy, and Gibbs free energy. These thermodynamic potentials can be expressed using two of the following variables: pressure, volume, temperature, and entropy. These two variables are expressed as the rate of change of the thermodynamic potential with respect to other...

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Related Experiment Video

Updated: Jun 24, 2025

Characterization of Thermal Transport in One-dimensional Solid Materials

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

2D Materials-Based Thermal Interface Materials: Structure, Properties, and Applications.

Wen Dai^1,2, Yandong Wang^1,2, Maohua Li^1,2

¹Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo, 315201, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|June 7, 2024

Summary

High-performance thermal interface materials (TIMs) using 2D materials like graphene and boron nitride are crucial for advanced electronics. This review explores their development, challenges, and future potential for efficient heat dissipation.

Keywords:

2D materials boron nitride development history graphene thermal interface materials

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Last Updated: Jun 24, 2025

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Thermal Measurement Techniques in Analytical Microfluidic Devices

Thermal Measurement Techniques in Analytical Microfluidic Devices

Published on: June 3, 2015

Area of Science:

Materials Science
Nanotechnology
Thermal Engineering

Background:

High-power electronic devices require efficient heat dissipation to prevent overheating.
Traditional thermal interface materials (TIMs) face limitations in meeting these demands.
Two-dimensional (2D) materials offer superior thermal conductivity for advanced TIMs.

Purpose of the Study:

To review the development and applications of 2D material-based TIMs.
To focus on graphene and boron nitride as key materials in TIMs.
To analyze challenges and propose solutions for 2D material TIMs.

Main Methods:

Literature review of 2D material-based TIMs.
Analysis of structural properties and thermal conductivity.
Exploration of preparation methods and applications.

Main Results:

Graphene and boron nitride exhibit ultrahigh thermal conductivity.
2D materials enable versatile structural designs for TIMs.
Significant progress has been made in developing 2D material TIMs.

Conclusions:

2D material-based TIMs are essential for next-generation electronics.
Addressing current challenges will unlock further advancements.
Future research should explore novel 2D materials for enhanced thermal management.