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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...

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.

Mechanisms of Heat Transfer

Mechanisms of Heat Transfer

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...

Mechanism of heat transfer

Mechanism of heat transfer

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...

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...

Temperature and Thermal Equilibrium

Temperature and Thermal Equilibrium

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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Related Experiment Video

Updated: Dec 9, 2025

Thermocapillary Convection Space Experiment on the SJ-10 Recoverable Satellite

Thermocapillary Convection Space Experiment on the SJ-10 Recoverable Satellite

Published on: March 11, 2020

A Continuously Tunable Solid-Like Convective Thermal Metadevice on the Reciprocal Line.

Jiaxin Li^1,2, Ying Li^2,3,4, Pei-Chao Cao⁵

¹School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, China.

Advanced Materials (Deerfield Beach, Fla.)

|September 9, 2020

Summary

Researchers developed a novel thermal metadevice that dynamically controls heat transfer. This breakthrough allows for flexible heat flow management, mimicking solid materials with tunable thermal conductivity for diverse applications.

Keywords:

convection reciprocity thermal metadevices

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Last Updated: Dec 9, 2025

Thermocapillary Convection Space Experiment on the SJ-10 Recoverable Satellite

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Published on: March 11, 2020

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Published on: February 4, 2018

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Area of Science:

Thermodynamics
Materials Science
Metamaterials

Background:

Emerging thermal metamaterials offer potential for advanced thermal conduction control.
Current devices have fixed thermal conductivities due to static configurations.
Thermal convection offers flexible heat transfer but differs fundamentally from conduction.

Purpose of the Study:

To bridge the gap between convective and conductive heat transfer.
To develop a thermal system with dynamically tunable properties.
To enable sophisticated control over heat flow using convection.

Main Methods:

Investigated mechanically rotating systems to exploit reciprocal lines.
Developed a thermal metadevice integrating convective principles.
Demonstrated the system's ability to mimic conductive materials.

Main Results:

A convective system was engineered to be indistinguishable from a conductive one.
The thermal metadevice exhibited dynamically tunable thermal conductivity.
The system achieved a wide dynamic range of heat transfer control.

Conclusions:

A novel approach to thermal management using convection has been established.
The developed thermal metadevice offers real-time, smooth control over heat transfer.
This technology opens possibilities for broad applications requiring flexible thermal control.