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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...

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Related Experiment Video

Updated: Dec 15, 2025

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment

Published on: December 3, 2019

3D Interconnected Gyroid Au-CuS Materials for Efficient Solar Steam Generation.

Peng Sun¹, Wanlin Wang², Wang Zhang¹

¹School of Materials Science and Engineering, The State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China.

ACS Applied Materials & Interfaces

|July 10, 2020

Summary

Researchers developed novel 3D gyroid-structured gold-copper sulfide (Au-CuS) materials for enhanced solar steam generation. These materials utilize 3D hotspots for superior light-matter interactions, achieving high evaporation efficiency with minimal component loading.

Keywords:

bioinspired gyroid metal−semiconductor plasmonic absorption solar steam generation

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Last Updated: Dec 15, 2025

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment

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Published on: December 3, 2019

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

Published on: October 18, 2017

Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries

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Published on: April 22, 2013

Area of Science:

Materials Science
Nanotechnology
Renewable Energy

Background:

Surface plasmon resonance (SPR) technology offers potential for photothermal conversion, solar cells, photocatalysis, and sensing.
Current SPR applications are limited by 1D or 2D distributed hotspots, hindering optimal performance.

Purpose of the Study:

To fabricate bioinspired Au-CuS gyroid-structured materials with 3D-distributed hotspots for enhanced solar steam generation.
To investigate the structure-property relationships governing the performance of these novel materials in light energy conversion.

Main Methods:

Fabrication of Au-CuS gyroid-structured materials by controlling CuS nanoparticle deposition time.
Characterization of material properties, including filling rate and inner surface area.
Evaluation of solar steam generation efficiency under normal 1 sun irradiation.

Main Results:

Au-CuS/GMs-80 exhibited the highest evaporation efficiency (88.8%) due to a 57% filling rate and large inner surface area (∼2.72 × 10^5 nm^2 per unit cell).
The material demonstrated a balance between water absorption and evaporation, alongside efficient heat conduction.
Superior performance was achieved with significantly lower photothermal component loading (<1 mg cm^-2) compared to state-of-the-art devices.

Conclusions:

The 3D interconnected gyroid nanostructure enhances light-matter interactions and light energy conversion efficiency.
Controllable metal-semiconductor deposition in 3D nanostructures offers a new pathway for designing high-performance plasmonic devices.
These findings pave the way for advanced solar steam generation technologies.