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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

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.

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...

Thermal and Photochemical Electrocyclic Reactions: Overview

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.

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Related Experiment Video

Updated: Feb 22, 2026

Author Spotlight: Advancing Energy Solutions Using Nanocomposites as Processed Thermoelectric Materials

Author Spotlight: Advancing Energy Solutions Using Nanocomposites as Processed Thermoelectric Materials

Published on: May 17, 2024

Novel Principles and Nanostructuring Methods for Enhanced Thermoelectrics.

¹National Institute for Materials Science (NIMS), International Center for Materials Nanoarchitectonics (MANA), Namiki 1-1, Tsukuba, 305-0044, Japan.

Small (Weinheim an Der Bergstrasse, Germany)

|September 30, 2017

Summary

Thermoelectric (TE) materials convert waste heat to electricity. Novel nanostructuring, like creating nano-micropores, significantly enhances TE performance, achieving a new paradigm for porous materials.

Keywords:

magnetic semiconductor nanostructuring power factor thermal conductivity thermoelectric

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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

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Last Updated: Feb 22, 2026

Author Spotlight: Advancing Energy Solutions Using Nanocomposites as Processed Thermoelectric Materials

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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Published on: February 5, 2020

Area of Science:

Materials Science
Solid-State Physics
Energy Conversion

Background:

Thermoelectric (TE) materials offer direct solid-state conversion of waste heat to electricity, crucial for sustainable energy generation.
Enhancing TE performance is challenging due to conflicting requirements for high electrical conductivity, low thermal conductivity, and a large Seebeck coefficient.

Purpose of the Study:

To review recent advances in thermoelectric materials research.
To highlight novel strategies for overcoming intrinsic performance limitations in thermoelectrics.

Main Methods:

Bottom-up nanostructuring techniques, including nanosheets, dislocations, and nano-micropore fabrication.
Development of nanocomposite materials with hybrid effects and magnetic properties.
Application of material informatics for identifying high-performance TE materials.

Main Results:

Fabrication of nano-microporous structures led to a 100% enhancement in the figure of merit (ZT ≈ 1.6) for rare-earth-free skutterudites, challenging the notion that porous materials have poor TE performance.
Nanocomposite materials and magnetic approaches show promise for enhancing TE properties.
Material informatics accelerates the discovery of new high-ZT materials.

Conclusions:

Nanostructuring, particularly nano-micropore creation, represents a new paradigm for enhancing thermoelectric performance.
Hybrid nanocomposites and magnetic effects offer alternative routes to improved thermoelectric materials.
Advanced computational and material informatics approaches are vital for future thermoelectric material discovery.