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Related Concept Videos

Mechanisms of Heat Transfer01:14

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.
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...
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Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
1.7K
Mechanism of heat transfer01:19

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...
1.6K
Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
2.2K
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

3.8K
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...
3.8K
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

5.2K
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.
5.2K

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Related Experiment Video

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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

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Smart Materials for Dynamic Thermal Radiation Regulation.

Hang Wei1, Jinxin Gu2, Feifei Ren1

  • 1Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China.

Small (Weinheim an Der Bergstrasse, Germany)
|May 20, 2021
PubMed
Summary

Smart materials can dynamically regulate thermal radiation, overcoming limitations of conventional materials. This review explores mechanisms and applications of these advanced materials for intelligent thermal management.

Keywords:
dynamic regulationemissivitysmart materialsthermal radiation

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Area of Science:

  • Materials Science
  • Optics
  • Thermodynamics

Background:

  • Mid-infrared thermal radiation is crucial for applications like imaging, sensing, and thermal management.
  • Conventional materials have fixed emissivities, limiting their thermal functions to a single capability.
  • Dynamic regulation of thermal radiation is needed for advanced applications in intelligent machines.

Purpose of the Study:

  • To review the dynamic regulatory mechanisms of smart materials for thermal radiation.
  • To summarize recent progress in evaluating these smart materials.
  • To highlight potential applications, challenges, and future strategies.

Main Methods:

  • Review of scientific literature on smart materials for thermal radiation control.
  • Analysis of dynamic regulatory mechanisms including thermochromic, electrochromic, and responsive materials.
  • Evaluation of material performance for various applications.

Main Results:

  • Smart materials offer dynamic control over thermal radiation, unlike conventional materials.
  • Thermochromic, electrochromic, and responsive materials demonstrate tunable emissivity.
  • These materials show significant potential for advanced thermal management and sensing.

Conclusions:

  • Dynamic thermal radiation regulation is essential for intelligent systems.
  • Smart materials provide versatile solutions for adaptive thermal functions.
  • Further research is needed to address limitations and optimize applications.