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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 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.

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 heat.

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: Jun 27, 2026

Comparative Study of Simulation of Temperature Rise in Ring Main Unit

Comparative Study of Simulation of Temperature Rise in Ring Main Unit

Published on: July 5, 2024

Heat Transfer Modulation of Micro-Textured Interfaces: A Multi-Scale Topology Optimization and Numerical Simulation.

Qing Rao¹, Benben Guo¹, Jiafu Ruan²

¹No. 6 Engineering (Xiamen), CCCC Third Harbor Engineering Co., Ltd., No. 189 Huachang Road, Huli District, Xiamen 361006, China.

|June 26, 2026

Summary

This study introduces a hybrid thermal management system for deep-sea LED Fish-Attracting Lamps (FALs) to reduce excessive junction temperatures. The novel design enhances heat dissipation and maintains pressure resistance for high-power illumination systems.

Keywords:

chimney-effect convection fish-attracting lamp heat pipe phase-change heat transfer modulation micro-textured interface multi-scale topology optimization

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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Published on: May 2, 2016

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Last Updated: Jun 27, 2026

Comparative Study of Simulation of Temperature Rise in Ring Main Unit

Comparative Study of Simulation of Temperature Rise in Ring Main Unit

Published on: July 5, 2024

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Published on: May 2, 2016

Area of Science:

Thermal Management
Optical Engineering
Materials Science

Background:

Deep-sea LED Fish-Attracting Lamps (FALs) face challenges with ultra-high heat flux densities (>100 W/cm²), leading to excessive junction temperatures.
Effective thermal management is crucial for the reliability and performance of high-power deep-sea illumination systems.

Purpose of the Study:

To propose and validate a hybrid thermal management scheme for deep-sea FALs that integrates interfacial micro-texturing, chimney-effect convection, and heat pipe phase-change heat transfer.
To achieve passive high-efficiency heat dissipation and pressure-resistant sealing for deep-sea LED arrays.

Main Methods:

Topology optimization of FAL housing to create chimney-effect enhanced flow channels integrated with heat pipe bundles.
Fabrication of Micro-Element Texture (MET) arrays at the Phenolic Resin Substrate (PRS) thermal interface to improve thermal conductance.
Multi-physics coupled numerical simulation and response surface methodology for parametric optimization of micro-texture configurations.
Construction of a thermal interface performance testing platform for model validation.

Main Results:

The integrated heat pipe technology effectively suppresses LED junction temperature rise.
Groove-type MET arrays, oriented perpendicular to gravity, increased effective heat dissipation area and optimized natural convection.
The proposed hybrid scheme reduced the maximum operating temperature of deep-sea FALs by 6.70% compared to conventional structures.

Conclusions:

The developed hybrid thermal management scheme offers an effective engineering solution for the thermal-structural design of high-power deep-sea illumination systems.
The integration of micro-texturing, chimney-effect convection, and heat pipes successfully addresses the thermal challenges in demanding deep-sea environments.