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  3. Measurement Of Lamella Thickness Evolution During Droplet Spreading On A Dry Surface And Insights Into Energy Distribution During The Process.
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  3. Measurement Of Lamella Thickness Evolution During Droplet Spreading On A Dry Surface And Insights Into Energy Distribution During The Process.

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Measurement of Lamella Thickness Evolution during Droplet Spreading on a Dry Surface and Insights into Energy

Surendran Mikhil1, Koushik Biswas1, Shamit Bakshi1

  • 1Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 16, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

This study examines liquid film evolution from droplet impact using advanced sensors. It introduces a new energy model with transient boundary layers for accurate droplet spread prediction.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Impact dynamics

Background:

  • Droplet impact dynamics are crucial for various industrial processes.
  • Accurate modeling of liquid film evolution and energy dissipation is essential.
  • Existing models often simplify boundary layer behavior.

Purpose of the Study:

  • To investigate the temporal evolution of liquid films during high Weber and Reynolds number droplet impacts.
  • To develop an improved energy-based model for droplet spread prediction.
  • To incorporate transient boundary layer effects and early-stage energy dissipation.

Main Methods:

  • Utilizing a Chromatic Confocal Sensor for lamella thickness measurement.
  • Employing shadow imaging to determine droplet spread factors.
  • Developing a theoretical framework based on energy balance equations.

Main Results:

  • Identified distinct phases in droplet height/lamella thickness evolution.
  • Proposed a model using transient boundary layer thickness and appropriate velocity scales.
  • Demonstrated the importance of early-stage energy dissipation in energy budgeting.
  • Developed a differential energy balance equation that accurately predicts spreading diameter.

Conclusions:

  • The proposed energy-based model with transient boundary layers accurately captures droplet spread dynamics.
  • Accounting for early-stage and wall boundary layer dissipations enhances predictive capabilities.
  • This research provides a more refined approach to modeling droplet impact phenomena.