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Related Concept Videos

Mechanism of heat transfer01:19

Mechanism of heat transfer

1.2K
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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Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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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...
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Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

284
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...
284
Mechanisms of Heat Transfer I01:14

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.
4.2K
Thermal Strain01:19

Thermal Strain

746
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
746
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

143
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
143
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  11. Shaping Thermal Transport And Temperature Distribution Via Anisotropic Carbon Fiber Reinforced Composites.
  1. Home
  3. Research Domains
  5. Engineering
  7. Materials Engineering
  9. Wearable Materials
  11. Shaping Thermal Transport And Temperature Distribution Via Anisotropic Carbon Fiber Reinforced Composites.

Related Experiment Video

Characterization of Thermal Transport in One-dimensional Solid Materials
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Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

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Shaping Thermal Transport and Temperature Distribution via Anisotropic Carbon Fiber Reinforced Composites.

Flora Lebeda1,2, Martin Demleitner3, Annalena Pongratz3

  • 1Department of Chemistry, Physical Chemistry I, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany.

ACS Omega
|September 23, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

New composite materials with anisotropic thermal properties offer precise control over heat flow for electronic systems. This enables targeted heat dissipation or blocking, crucial for managing thermal challenges in electric vehicles.

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Author Spotlight: Enhancing Fiber Composite Laminate Quality with the Wet Hand Lay-Up/Vacuum Bag Process
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Area of Science:

  • Materials Science
  • Thermal Engineering
  • Composite Materials

Background:

  • Electrification of vehicles necessitates advanced thermal management solutions.
  • Overheating in electronic systems requires novel thermal dissipation strategies.
  • Thermally anisotropic materials offer directional heat transport capabilities.

Purpose of the Study:

  • To investigate the use of anisotropic laminates for controlled heat transport.
  • To demonstrate the ability to tailor heat flow in composite materials.
  • To explore the influence of anisotropy orientation on heat dissipation.

Main Methods:

  • Fabrication of laminates with unidirectionally aligned carbon fibers in a polymer matrix.
  • Application of temperature gradients to assess anisotropic thermal conduction.
  • Visualization of heat flow using infrared (IR) thermography.
  • Assembly of anisotropic laminate discs into composite structures.

    • Main Results:

    • Thermal transport in laminates is governed by their anisotropic properties.
    • Composite materials built from anisotropic components allow precise control of macroscopic heat flow.
    • Selective heat flow guidance is achieved by orienting anisotropy relative to temperature gradients.
    • Key factors influencing heat transport include anisotropy ratio, component arrangement, and positioning.

    Conclusions:

    • A novel concept for locally controlling heat flow in composites was developed.
    • Materials can be engineered to either dissipate or block heat transport.
    • The proposed method is extendable to 2D and 3D composite structures for versatile thermal management.