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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

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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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Mechanism 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...

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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Related Experiment Video

Updated: Dec 30, 2025

Experimental Procedure for Warm Spinning of Cast Aluminum Components

Experimental Procedure for Warm Spinning of Cast Aluminum Components

Published on: February 1, 2017

Aluminum Inserts for Enhancing Heat Transfer in PCM Accumulator.

Anna Dmitruk¹, Krzysztof Naplocha¹, Jakub Grzęda¹

¹Chair of Lightweight Elements Engineering, Foundry and Automation, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370, Wroclaw, Poland.

Materials (Basel, Switzerland)

|January 23, 2020

Summary

Metallic inserts significantly improve phase change material (PCM) heat storage units by enhancing thermal conductivity. This leads to faster charging, longer heat release, and reduced temperature gradients in energy storage systems.

Keywords:

PCM energy storage heat transfer honeycomb structure investment casting metallic foam

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Last Updated: Dec 30, 2025

Experimental Procedure for Warm Spinning of Cast Aluminum Components

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Published on: February 1, 2017

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Published on: August 7, 2018

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Published on: February 5, 2020

Area of Science:

Materials Science
Thermal Engineering
Energy Storage

Background:

Phase change materials (PCMs) store thermal energy via latent heat but suffer from low thermal conductivity.
This limitation hinders their widespread application in industrial waste heat recovery.

Purpose of the Study:

To investigate the impact of metallic inserts on the thermal performance of PCM-based heat storage units.
To optimize the design and integration of Al-Si foams and honeycomb structures.

Main Methods:

Al-Si foams and honeycomb structures were fabricated using investment casting.
Surface roughness, compressive strength, and fatigue resistance were evaluated.
Thermal performance was analyzed through heat flux calculations and experimental testing in a PCM accumulator.

Main Results:

Metallic inserts significantly improved heat storage system performance.
Reduced charging time, extended heat release duration, and increased maximum temperature were observed.
A notable decrease in the temperature gradient within the heat storage unit was achieved.

Conclusions:

Al-Si metallic inserts effectively enhance the thermal conductivity of PCM heat storage systems.
Optimized metallic inserts offer a viable solution for improving energy storage efficiency and thermal management.