Related Experiment Video
Updated: Jan 21, 2026
09:00
High Throughput Analysis of Liquid Droplet Impacts
Published on: March 6, 2020
7.0K
Viscous Droplet Impact on Nonwettable Textured Surfaces
Mehran Abolghasemibizaki1,2, Neda Dilmaghani1, Reza Mohammadi1
1Department of Mechanical and Nuclear Engineering , Virginia Commonwealth University , Richmond , Virginia 23284 , United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 25, 2019
Summary
Investigating viscous droplet impact on nonwettable surfaces reveals that surface texture significantly reduces contact time. This finding is crucial for understanding fluid dynamics on complex geometries.
Area of Science:
- Fluid Dynamics
- Surface Science
- Materials Science
Background:
- Understanding droplet impact on nonwettable surfaces is vital for technological applications.
- The dynamics of viscous droplet impact on complex geometries remain incompletely understood.
Purpose of the Study:
- To investigate the behavior of viscous liquid drops impacting nonwettable flat and textured surfaces.
- To correlate droplet behavior, specifically contact time, with varying viscosities and impact velocities.
Main Methods:
- Experimental investigation of liquid drops with diverse viscosities and impact velocities.
- Analysis of droplet contact time on nonwettable flat and macroscopically textured surfaces (single and multiple ridges).
Main Results:
- In the inertial-capillary regime, droplet contact time on a flat surface is independent of impact velocity.
- In the viscous-capillary regime, contact time on a flat surface increases with impact velocity.
- Impacts on textured surfaces with ridges generally result in reduced contact times compared to flat surfaces.
Conclusions:
- Surface macrotexture, particularly ridges, significantly reduces droplet contact time.
- A single macrotexture can cause a steplike reduction in contact time when the capillary number is below unity, facilitating maximum spreading.
Related Concept Videos
01:25Shape and Texture of Coarse Aggregate
670
Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
670
01:19Impact of Groups on Groups
236
Social psychologists analyze how groups influence one another, shaping social structures and interactions through both cooperation and competition. These dynamics manifest in various ways, ranging from economic partnerships to intergroup conflicts that shape societal structures and perceptions.Cooperation and Competition in Intergroup RelationsIntergroup relationships vary across contexts, sometimes fostering cooperation and mutual benefit while at other times leading to conflict and...
236
01:30Impact
483
Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
483
02:57Surface Tension, Capillary Action, and Viscosity
33.0K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
33.0K
01:19Impact Loading
670
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
In cases of elastic deformation,...
670
01:30Types of Impact
1.0K
Impacts can be classified in various forms, primarily under two subgroups: central impact and oblique impact. A central impact occurs when two objects collide head-on, possessing opposite velocities aligned along the line of impact. Conversely, an oblique impact occurs when two objects collide at an angle, resulting in a modification of both direction and velocity.
The coefficient of restitution is a metric for understanding the dynamics of impacts. It quantifies the ratio of relative velocity...
The coefficient of restitution is a metric for understanding the dynamics of impacts. It quantifies the ratio of relative velocity...
1.0K