What is it about?
This article explores the behavior of fluids (such as air, water, or oil) when they flow very close to a solid surface. Typically, we assume that fluid particles immediately adjacent to the surface don't move (they "stick") and that heat transfers smoothly across the boundary. But in reality—especially at very small scales—the fluid can slide along the surface, and the temperature can suddenly jump at the boundary. This article reviews how and why these effects occur; what past experiments and theories have shown; and how scientists can simulate these behaviors.
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Why is it important?
These unusual behaviors are crucial in modern technology, particularly in microchips and nanodevices, medical tools, and electronic cooling systems. Ignoring slip and temperature jumps at small scales can lead to incorrect predictions and poor designs. Understanding these effects can help engineers build more efficient and precise systems.
Perspectives
The paper states: We need models that are more applicable to gases and liquids, more precise experiments to measure these small effects, and that surface properties (such as roughness or the ease with which a surface is wetted) play an important role. This research is particularly useful for fields such as nanotechnology, microfluidics, and thermal engineering, where traditional assumptions no longer apply.
Professor Jian-Jun SHU
Nanyang Technological University
Read the Original
This page is a summary of: Fluid Velocity Slip and Temperature Jump at a Solid Surface, Applied Mechanics Reviews, March 2017, ASME International,
DOI: 10.1115/1.4036191.
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