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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...

Mechanisms of Heat Transfer

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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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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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Related Experiment Video

Updated: Jan 9, 2026

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

Published on: April 10, 2017

Heat transfer enhancement using nanoporous Teflon surfaces.

Sarathy Kannan Gopalakrishnan¹, Jiarang Liu², Matthias A J Trujillo-Torres³

¹Department of Chemical Engineering, University of Florida, Department of Chemical Engineering, 1006 Center Dr, Gainesville, Gainesville, Florida, 32611, UNITED STATES.

|December 9, 2025

Summary

Nanoporous Teflon surfaces significantly enhance heat transfer and speed up vaporization for acetone droplets. This advancement offers potential for substantial energy savings in industrial thermal management applications.

Keywords:

Bubbles Hexagonal Interfaces Nanopores Nanopores Teflon Hexagonal Wettability Bubbles Interfaces Teflon Wettability

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Last Updated: Jan 9, 2026

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Area of Science:

Thermal Management
Phase Change Heat Transfer
Nanotechnology

Background:

Liquid-vapor phase change heat transfer is crucial for industrial thermal management.
Enhancing phase change heat transfer efficiency can lead to significant energy savings and reduced greenhouse gas emissions.
Current thermal management strategies require improved heat transfer capabilities.

Purpose of the Study:

To investigate the heat transfer performance of a nanoporous Teflon surface.
To evaluate the vaporization rates of acetone on the nanoporous surface compared to a flat surface.
To quantify the enhancement in heat transfer efficiency provided by the nanoporous surface.

Main Methods:

Droplet vaporization experiments were conducted using acetone as the working fluid.
A digital camera with a high frame rate (60 fps) recorded the vaporization process.
Heat flux was calculated based on the time required for vaporization and droplet area on the heated nanoporous and flat Teflon surfaces.

Main Results:

The nanoporous Teflon surface exhibited 1.8 times enhanced heat transfer compared to a flat Teflon surface.
Vaporization rates were 2.8 times faster on the nanoporous surface for the same liquid volume of acetone.
The tested surface demonstrated superior performance under various heating temperatures.

Conclusions:

Nanoporous Teflon surfaces significantly improve heat transfer efficiency during liquid-vapor phase change.
The enhanced surface dramatically accelerates droplet vaporization rates, offering practical benefits for thermal management.
This technology presents a viable solution for energy savings and emission reduction in industrial applications.