Marangoni Convection-Driven Laser Fountains on Free Surfaces of Liquids

POSTER

Abstract

It is well known that an outward Marangoni convection from a low surface tension region will make the free surface of a liquid depressed. Here, we report that this established perception is only valid for thin liquid films. Using surface laser heating, we show that in deep liquids a laser beam pulls up the fluid above the free surface generating fountains with different shapes, and with decreasing liquid depth a transition from fountain to indentation with fountain-in-indentation is observed. High-speed imaging captures a transient surface depression before steady elevation is formed, and computational fluid dynamics simulations reveal the underlying flow patterns and quantify the depth-dependent and time-resolved surface deformations. Systematic investigation of the effect of laser parameters, surface tension and area of the fluid on its surface deformation further confirms that the laser fountain is a result of dynamic competition between outgoing Marangoni convection and the upward recirculation flow. Experiments and simulations also reveal that a smaller surface area can dramatically strengthen laser fountain. The discovery of laser fountain and the development of related experimental and simulation techniques have upended a century–old perception and opened up a new regime of interdisciplinary research and applications of Marangoni-induced interface phenomena.

*NSFC (No. 62075034 and No. 52002049).Welch Foundation (E-1728) .

Presenters

  • Feng Lin

    • Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China
    • Yangtze Delta Region Institute (Huzhou), UESTC
    • University of Electronic Science and Technology of China

Authors

  • Feng Lin

    • Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China
    • Yangtze Delta Region Institute (Huzhou), UESTC
    • University of Electronic Science and Technology of China

  • Aamir Nasir Quraishy

    • University of Arizona

  • Tian Tong

    • University of Houston

  • Runjia Li

    • University of Houston

  • Guang Yang Guang Yang

    • University of Houston

  • Mohammadjavad Mohebinia

    • University of Houston

  • Yi Qiu

    • Southwest Petroleum University

  • Talari Vishal Talari Vishal

    • University of Houston

  • Junyi Zhao

    • Washington University in St. Louis, St. Louis
    • Washington University in St. Louis

  • Wei Zhang

    • Baylor University

  • Hong Zhong

    • University of Electronic Science and Technology of China

  • Hang Zhang

    • University of Electronic Science and Technology of China

  • Zhongchen Chen

    • University of Electronic Science and Technology of China

  • Chaofu Zhou

    • University of Electronic Science and Technology of China

  • Xin Tong

    • University of Electronic Science and Technology of China

  • Peng Yu

    • University of Electronic Science and Technology of China

  • Jonathan Hu

    • Baylor University

  • Suchuan Dong

    • Purdue University

  • Dong Liu

    • University of Houston

  • Zhiming Wang

    • Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China

  • John R. Schaibley

    • University of Arizona

  • Jiming Bao

    • University of Houston