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Related Concept Videos

Single Pipe Systems01:24

Single Pipe Systems

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In pipe flow analysis, problems are typically categorized into three types — Type I, Type II, and Type III — based on the known parameters and the desired outcome. Each type of problem addresses specific engineering requirements using fluid properties, pipe characteristics, and operational conditions.
In a Type I problem, fluid properties (density and viscosity), pipe characteristics (including diameter, length, and surface roughness), and the flow rate or average velocity are...
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Multiple Pipe Systems01:21

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Multipipe systems consist of complex configurations of interconnected pipes designed to transport fluids efficiently across intricate networks. They are essential in engineering applications requiring precise control over flow distribution, pressure, and head loss. They are categorized into series, parallel, loop, and network configurations, each distinguished by unique flow characteristics and applications.
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Mechanisms of Heat Transfer II01:20

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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 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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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.
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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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Updated: Sep 7, 2025

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Three-Tier Hierarchical Structures for Extreme Pool Boiling Heat Transfer Performance.

Youngsup Song1, Carlos D Díaz-Marín1, Lenan Zhang1

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.

Advanced Materials (Deerfield Beach, Fla.)
|June 20, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel three-tier hierarchical structure to overcome the trade-off between heat-transfer coefficient (HTC) and critical heat flux (CHF) in boiling. This design significantly enhances both HTC and CHF, promising major energy savings in boiling applications.

Keywords:
critical heat fluxheat-transfer coefficienthierarchical structuresmicrostructuresnanostructuresphase-change heat transfer

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Area of Science:

  • Heat transfer and thermodynamics
  • Materials science and engineering
  • Energy conversion and storage

Background:

  • Boiling is a crucial energy transfer process in many applications.
  • Boiling performance is characterized by heat-transfer coefficient (HTC) and critical heat flux (CHF).
  • A trade-off typically exists between enhancing HTC and CHF, limiting simultaneous improvement.

Purpose of the Study:

  • To overcome the intrinsic trade-off between HTC and CHF enhancement.
  • To design and investigate a novel three-tier hierarchical structure for enhanced boiling performance.
  • To achieve simultaneous significant enhancement of both HTC and CHF.

Main Methods:

  • Designed a three-tier hierarchical structure combining microcavities, hemi-wicking structures, and nanostructures.
  • Microcavities and hemi-wicking structures were used to define nucleation sites and minimize bubble coalescence, enhancing CHF.
  • Nanostructures were incorporated to promote evaporation and compensate for reduced nucleation site density, enhancing HTC.

Main Results:

  • The hierarchical structures achieved simultaneous enhancement of HTC by up to 389% and CHF by up to 138% compared to a smooth surface.
  • The design effectively minimized bubble coalescence.
  • The nanostructures successfully promoted evaporation for HTC enhancement.

Conclusions:

  • The developed three-tier hierarchical structure successfully overcomes the HTC-CHF trade-off.
  • This novel design leads to extreme boiling performance with significant HTC and CHF enhancements.
  • The findings have the potential for substantial energy savings in various boiling applications.