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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...

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

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...

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.

Absorption of Radiation

Absorption of Radiation

The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:

Radiation: Applications

Radiation: Applications

The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...

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Related Experiment Video

Updated: Aug 24, 2025

Fabrication of Low Temperature Carbon Nanotube Vertical Interconnects Compatible with Semiconductor Technology

Fabrication of Low Temperature Carbon Nanotube Vertical Interconnects Compatible with Semiconductor Technology

Published on: December 7, 2015

Radiative heat transfer between two carbon nanotubes.

Igor S Nefedov¹, Michael V Davidovich¹, Olga E Glukhova^1,2

¹Department of Physics, Saratov State University, Astrakhanskaya street 83, Saratov, Russia, 410012.

Scientific Reports

|October 26, 2022

Summary

This summary is machine-generated.

Radiative heat transfer between carbon nanotubes (CNTs) depends on their distance and chirality. This finding enables designing nanostructures for efficient heat exchange.

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Fabrication of Low Temperature Carbon Nanotube Vertical Interconnects Compatible with Semiconductor Technology

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Preparation and Evaluation of Hybrid Composites of Chemical Fuel and Multi-walled Carbon Nanotubes in the Study of Thermopower Waves

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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

Published on: April 28, 2016

Area of Science:

Nanoscale heat transfer
Quantum electrodynamics
Materials science

Background:

Radiative heat transfer is crucial for nanoscale thermal management.
Carbon nanotubes (CNTs) offer unique thermal and electronic properties.
Understanding CNT-based heat exchange is vital for advanced nanodevices.

Purpose of the Study:

To analyze radiative heat transfer between two parallel carbon nanotubes (CNTs).
To investigate the influence of CNT chirality on radiative heat exchange.
To explore the design of nanostructures for optimized radiative heat transfer.

Main Methods:

Utilizing Poynting vectors to quantify radiative heat exchange.
Employing Green's function and fluctuation-dissipation theorem for electromagnetic field correlations.
Incorporating the effects of field scattering by nanotubes.

Main Results:

Radiative heat transfer is directly linked to Poynting vectors from fluctuating currents.
Heat exchange is dependent on the distance between CNTs.
CNT chirality significantly impacts radiative heat transfer, differentiating between semiconducting and metallic behaviors.

Conclusions:

The study elucidates the fundamental mechanisms of radiative heat transfer between CNTs.
CNT chirality is a critical design parameter for controlling radiative heat exchange.
Findings pave the way for engineering nanostructures with tailored thermal properties.