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Related Concept Videos

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

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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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Mechanisms of Heat Transfer I01:14

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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.
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Mechanism of heat transfer01:19

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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...
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General External Flow Characteristics01:26

General External Flow Characteristics

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The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
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Drag01:23

Drag

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Drag is a resistive force opposing an object’s motion through a fluid, resulting from surface pressure and shear forces. It comprises two components: a perpendicular one from pressure and a tangential one from shear stress. Accurate drag calculations use pressure and wall shear stress distributions, often determined through Computational Fluid Dynamics (CFD) or wind tunnel testing. The drag coefficient, a dimensionless measure, depends on factors like shape, Reynolds number, Mach number,...
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Related Experiment Video

Updated: Oct 30, 2025

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Nature-Inspired Structures Applied in Heat Transfer Enhancement and Drag Reduction.

Zhangyu Zhu1, Juan Li1, Hao Peng2

  • 1School of Mechanical and Electrical Engineering, Nanjing Forestry University, 159 Long Pan Road, Nanjing 210037, China.

Micromachines
|July 2, 2021
PubMed
Summary
This summary is machine-generated.

Biomimetic structures enhance heat exchanger performance by improving heat transfer and reducing energy loss. This study reviews structures, mechanisms, and processing methods for optimized heat transfer efficiency.

Keywords:
biomimetic structuredrag reductionheat exchangerheat transfer enhancementoptimal design

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Fluid Dynamics

Background:

  • Heat exchangers are crucial for industrial energy management.
  • Optimizing heat transfer and minimizing energy consumption are key industrial goals.
  • Biomimetic structures offer a promising approach to enhance heat exchanger efficiency.

Purpose of the Study:

  • To review and analyze biomimetic structures for heat transfer enhancement.
  • To investigate the mechanisms behind heat transfer improvement and drag reduction.
  • To explore processing techniques for fabricating biomimetic heat transfer surfaces.

Main Methods:

  • Summarized six types of biomimetic structures: fractal-tree-like, conical column, hybrid wetting, scale, concave-convex, and superhydrophobic micro-nano structures.
  • Analyzed the characteristics, heat transfer enhancement, and drag reduction mechanisms of each structure.
  • Introduced four fabrication methods: photolithography, nanoimprinting, femtosecond laser processing, and 3D printing.

Main Results:

  • Biomimetic structures significantly enhance heat transfer coefficients.
  • These structures effectively reduce flow resistance, leading to lower energy consumption.
  • Various processing methods enable the precise fabrication of complex biomimetic designs.

Conclusions:

  • Biomimetic structures represent an effective strategy for optimizing heat exchanger performance.
  • The integration of biomimetic designs can lead to substantial energy savings in industrial applications.
  • Further research into biomimetic heat transfer structures holds significant potential for future advancements.