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Hydrostatic Pressure Force on a Plane Surface

Hydrostatic Pressure Force on a Plane Surface

When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...

Boundary Layer Characteristics

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When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...

Lift

Lift

Lift is a fundamental aerodynamic force that acts perpendicular to the direction of airflow. It plays a central role in achieving and sustaining flight and in stabilizing various vehicles. Lift primarily originates from pressure differences created across surfaces, such as an airfoil. A lower pressure region forms above the wing, while a higher pressure region forms below it, generating an upward force. This differential results from the shape and orientation of the airfoil, enabling the wing...

Hydrostatic Pressure Force on a Curved Surface

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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...

Surface Tension of Fluid

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
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Related Experiment Video

Updated: Oct 15, 2025

Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces

Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces

Published on: September 11, 2018

Low Air Drag Surface via Multilayer Hierarchical Riblets.

ZiDan Zhou¹, ShengKun Wang¹, ZeXiang Yan¹

¹Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaanxi Key Laboratory of Micro and Nano Electromechanical Systems, School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, P. R. China.

ACS Applied Materials & Interfaces

|October 28, 2021

Summary

New multilayer hierarchical riblets (MLHRs) inspired by shark skin achieve 16.67% air drag reduction. This significantly surpasses the previous limit, offering enhanced efficiency for aircraft and transportation.

Keywords:

air drag reduction closed air channel low air drag surface multilayer hierarchical riblets (MLHRs)vortex behavior

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Published on: February 11, 2020

Area of Science:

Fluid dynamics
Biomimetics
Surface engineering

Background:

Shark skin-inspired riblets offer significant air drag reduction potential.
Existing riblet designs have demonstrated drag reduction up to approximately 11%.

Purpose of the Study:

To develop and evaluate multilayer hierarchical riblets (MLHRs) for enhanced air drag reduction.
To investigate the mechanisms behind the improved performance of MLHRs.

Main Methods:

Fabrication of MLHRs using a three-layer hybrid mask lithography method.
Experimental testing of MLHRs in a closed air channel to measure air drag reduction.

Main Results:

MLHRs achieved a maximum air drag reduction of 16.67% in a closed air channel.
This represents a 52% improvement over the previously reported highest drag reduction.
Conceptual models explained the enhanced stability of vortices and reduced near-wall momentum exchange.

Conclusions:

MLHRs successfully overcome the current air drag reduction limitations of conventional riblets.
The findings provide a foundation for further advancements in riblet technology for drag reduction.
MLHRs demonstrate significant potential for applications in aerospace, energy, and transportation industries.