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Related Concept Videos

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...
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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 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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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Updated: Feb 5, 2026

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Enhanced Boiling Heat Transfer using Self-Actuated Nanobimorphs.

Sangwoo Shin1, Geehong Choi2, Bhargav Rallabandi3,4

  • 1Department of Mechanical Engineering , University of Hawaii at Manoa , Honolulu , Hawaii 96822 , United States.

Nano Letters
|September 1, 2018
PubMed
Summary
This summary is machine-generated.

A novel self-adapting nanostructured surface enhances boiling heat transfer. Nanoscale bimorph structures deform with temperature, increasing critical heat flux by 10% compared to nanowire surfaces.

Keywords:
Nanowiresbimorphboiling heat transfercritical heat fluxphase-change

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Nanotechnology

Background:

  • Boiling heat transfer is crucial for many industrial applications.
  • Enhancing critical heat flux (CHF) is a key challenge in heat transfer.
  • Nanostructured surfaces offer potential for improved heat transfer performance.

Purpose of the Study:

  • To introduce a novel self-adapting nanostructured surface for enhanced boiling heat transfer.
  • To investigate the mechanism of deformation in nanoscale bimorphs under thermal conditions.
  • To quantify the improvement in critical heat flux (CHF) offered by the proposed surface.

Main Methods:

  • Fabrication of freestanding nanoscale bimorph arrays with thermal expansion mismatch.
  • Experimental investigation of boiling heat transfer on the nanostructured surface.
  • Development and application of a theoretical model considering vapor film instability and capillary forces.

Main Results:

  • The nanostructured surface exhibits self-adaptive deformation in response to local thermal conditions during nucleate boiling.
  • A 10% increase in critical heat flux (CHF) was observed compared to a regular nanowire surface.
  • A theoretical model accurately predicted the CHF enhancement for the nanobimorph surface.

Conclusions:

  • The self-adapting nanostructured surface effectively enhances boiling heat transfer.
  • Nanoscale bimorph deformation is a viable mechanism for improving CHF.
  • The developed theoretical model provides a quantitative understanding of the observed enhancement.