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Related Concept Videos

Rise of Liquid in a Capillary Tube01:18

Rise of Liquid in a Capillary Tube

3.0K
When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
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Contact Angle01:13

Contact Angle

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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
18.1K
Capillarity in Fluid01:19

Capillarity in Fluid

823
Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
823
Bernoulli's Equation for Flow Normal to a Streamline01:16

Bernoulli's Equation for Flow Normal to a Streamline

1.3K
Bernoulli's equation for flow normal to a streamline explains how pressure varies across curved streamlines due to the outward centrifugal forces induced by the fluid's curvature. The pressure is higher on the inner side of the curve, near the center of curvature, and decreases outward to balance these centrifugal forces.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines. However, the...
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Hydrostatic Pressure Force on a Curved Surface01:04

Hydrostatic Pressure Force on a Curved Surface

2.5K
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...
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Bending of Curved Members - Neutral Surface01:16

Bending of Curved Members - Neutral Surface

486
In curved beams, unlike straight beams, the stress distribution across the cross-section is not uniform due to the beam's curvature. This non-uniformity arises because the neutral axis, where stress is zero, does not align with the centroid of the section. In a curved beam, the strain varies along the section as a function of the distance from the neutral axis.
Consider the curved member described in the previous lesson. According to Hooke's law, which relates stress to strain within the...
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Updated: Jan 16, 2026

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
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Corner angle effects on capillary rise along curved interior corners.

Zongyu Wu1, Bo Wu1, Yu Zhang1

  • 1College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China.

NPJ Microgravity
|September 26, 2025
PubMed
Summary

Spacecraft liquid management relies on understanding capillary flow in interior corners. Experiments show that decreasing the corner angle accelerates liquid movement, aiding spacecraft fluid system design.

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Area of Science:

  • Fluid dynamics
  • Spacecraft engineering
  • Microgravity science

Background:

  • Liquid management is critical for spacecraft, with interior corners used for passive liquid control.
  • Capillary flow in interior corners significantly impacts liquid behavior in microgravity.
  • Efficient space liquid transport necessitates a thorough understanding of these capillary flows.

Purpose of the Study:

  • To experimentally investigate the effect of corner angle on capillary flow in curved interior corners.
  • To provide insights for designing effective liquid transport devices in space.

Main Methods:

  • Drop tower experiments were conducted to simulate microgravity conditions.
  • The movement of liquid within interior corners of varying angles was observed and analyzed.

Main Results:

  • Liquid flow rate in curved interior corners is dependent on the corner angle.
  • A decrease in the corner angle leads to an observable increase in liquid movement speed.

Conclusions:

  • The corner angle is a key parameter influencing capillary flow dynamics in spacecraft interior corners.
  • Findings offer valuable guidance for optimizing spacecraft liquid management systems and propellant management devices.