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Drop Impact on Heated Nanostructures.

Lihui Liu1,2, Guobiao Cai1, Peichun Amy Tsai2

  • 1School of Astronautics, Beihang University, Beijing 100191, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 16, 2020
PubMed
Summary
This summary is machine-generated.

Nanostructured surfaces significantly alter water drop impact dynamics, triggering splashing and jetting. These surfaces also lower the dynamic Leidenfrost temperature, impacting heat transfer in various applications.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Heat transfer

Background:

  • Drop impact on heated surfaces is critical for industrial processes like inkjet printing and thermal management.
  • Understanding impact outcomes (deposition, spreading, rebound, atomization) is essential for optimizing these applications.
  • Surface topography significantly influences fluid behavior and heat transfer phenomena.

Purpose of the Study:

  • To investigate the impact dynamics of water drops on heated flat and nanostructured surfaces.
  • To characterize the influence of surface nanostructures on drop impact outcomes across varying impact velocities and surface temperatures.
  • To determine the effect of nanostructuring on the dynamic Leidenfrost temperature.

Main Methods:

  • Utilizing high-speed imaging to capture drop impact events.
  • Employing temperature measurements to monitor surface conditions.
  • Constructing phase diagrams to map impact outcomes based on impact velocity and surface temperature.
  • Analyzing normalized maximum spreading diameter and dynamic Leidenfrost temperature.

Main Results:

  • Nanostructured surfaces promote unique impact events like splashing and central jetting.
  • The presence of high-roughness nanotextures facilitates splashing and jetting phenomena.
  • Distinct trends in spreading diameter were observed at low and high Weber numbers.
  • High-roughness nanotextures reduced the dynamic Leidenfrost temperature by approximately 60 °C for a Weber number of 10.

Conclusions:

  • Surface nanostructuring profoundly impacts water drop impact dynamics and heat transfer.
  • Nanotextures can be engineered to control splashing and jetting, enhancing atomization.
  • The observed reduction in dynamic Leidenfrost temperature highlights the potential of nanostructured surfaces for improved cooling applications.