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Related Concept Videos

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...

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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Published on: April 10, 2017

Nucleate boiling performance on nano/microstructures with different wetting surfaces.

Hangjin Jo1, Seolha Kim, Hyungmo Kim

  • 1Two-Phase Flow Lab, Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Pohang, 790-784, Republic of Korea. mhkim@postech.ac.kr.

Nanoscale Research Letters
|May 8, 2012
PubMed
Summary
This summary is machine-generated.

Nano/microstructured surfaces enhance boiling heat transfer and critical heat flux, independent of surface wettability. Capillary-driven water penetration into structures is key to improved performance in boiling applications.

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Area of Science:

  • Heat transfer
  • Surface science
  • Nanotechnology

Background:

  • Nucleate boiling is crucial for efficient heat transfer in various applications.
  • Surface modification with nano/microstructures offers potential for enhanced boiling performance.
  • Understanding wettability effects on boiling is essential for optimizing heat transfer surfaces.

Purpose of the Study:

  • To investigate boiling heat transfer (BHT) and critical heat flux (CHF) on nano/microstructured surfaces.
  • To compare the performance of surfaces with different wettabilities (silicon-oxidized and Teflon-coated).
  • To elucidate the mechanisms behind enhanced BHT and CHF on these structured surfaces.

Main Methods:

  • Fabrication of identical nano/microstructures with varying wettabilities.
  • Conducting boiling experiments under atmospheric conditions.
  • Analyzing bubble dynamics and measuring dynamic contact angles.

Main Results:

  • Both BHT and CHF were enhanced on nano/microstructured surfaces, irrespective of wettability.
  • The degree of BHT and CHF enhancement varied with surface wettability.
  • Capillary-driven water penetration into surface structures was identified as a key mechanism for CHF enhancement.

Conclusions:

  • Nano/microstructured surfaces significantly improve boiling heat transfer and critical heat flux.
  • Surface wettability influences the extent of BHT and CHF enhancement.
  • Capillary phenomena play a vital role in the enhanced performance of structured boiling surfaces.