Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

ATP Driven Pumps III: V-type Pumps01:30

ATP Driven Pumps III: V-type Pumps

3.8K
V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
3.8K
Hydrostatic Pressure Force on a Curved Surface01:04

Hydrostatic Pressure Force on a Curved Surface

1.5K
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...
1.5K
Stokes' Law01:20

Stokes' Law

3.5K
Viscous forces, like friction, are intermolecular forces that resist the relative motion of molecules over each other. When a solid body moves through a liquid, viscous forces drag it in the opposite direction. The force's magnitude depends on the solid's shape and size, as well as its speed and the liquid's coefficient of viscosity, density and temperature.
The expression for the force on a solid spherical object in a fluid is called Stokes' law. Stokes' law is valid only...
3.5K
Gradually Varying Flow01:29

Gradually Varying Flow

700
Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
700
Viscosity of Fluid01:19

Viscosity of Fluid

2.2K
Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
2.2K
Accelerating Fluids01:17

Accelerating Fluids

2.2K
When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
2.2K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Helical opto-thermoviscous flows drive out-of-plane rotation and particle spinning in a highly viscous micro-environment.

Light, science & applications·2026
Same author

Design of an accessible turbulence chamber for laboratory experiments.

HardwareX·2026
Same author

Rotation reversal of chiral bacterial vortices.

Soft matter·2025
Same author

Pure Hydrodynamic Instabilities in Active Jets of Puller Microalgae.

Physical review letters·2025
Same author

Modal analysis and optimization of swimming active filaments.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences·2025
Same author

Load-dependent resistive-force theory for helical filaments.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences·2025
Same journal

A bio-inspired, soft-bodied jumper.

Bioinspiration & biomimetics·2026
Same journal

Structural and Functional Characteristics of the Exoskeletal Architecture of the Cuttlebone.

Bioinspiration & biomimetics·2026
Same journal

Design, Kinematic Modeling and Aerodynamic Performance Evaluation of a Beetle-Inspired Folding Wing with High Folding Ratio.

Bioinspiration & biomimetics·2026
Same journal

Proprioceptive Feedback Control Improves Peristaltic Turning in Confined Environments.

Bioinspiration & biomimetics·2026
Same journal

Design of an Inchworm-Inspired Crawling Robot Based on Dielectric Elastomers.

Bioinspiration & biomimetics·2026
Same journal

Landing-Induced Viscoelastic Changes in an Anthropomimetic Foot Joint Structure are Modulated by Foot Structure and Posture.

Bioinspiration & biomimetics·2026
See all related articles

Related Experiment Video

Updated: May 1, 2026

High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices
10:22

High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices

Published on: September 2, 2009

13.0K

Viscous pumping inspired by flexible propulsion.

Roger M Arco1, J Rodrigo Vélez-Cordero, Eric Lauga

  • 1Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apdo. Postal 70-360 México D.F. 04510, Mexico.

Bioinspiration & Biomimetics
|March 27, 2014
PubMed
Summary
This summary is machine-generated.

Flexible flappers create fluid pumping and mixing in low-Reynolds-number flows. Optimal pumping occurs when flapper length matches the elasto-hydrodynamic penetration length, enabling applications in microfluidics and mixing operations.

More Related Videos

A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
09:04

A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump

Published on: June 1, 2022

2.6K
A Robotic Platform to Study the Foreflipper of the California Sea Lion
08:53

A Robotic Platform to Study the Foreflipper of the California Sea Lion

Published on: January 10, 2017

7.4K

Related Experiment Videos

Last Updated: May 1, 2026

High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices
10:22

High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices

Published on: September 2, 2009

13.0K
A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
09:04

A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump

Published on: June 1, 2022

2.6K
A Robotic Platform to Study the Foreflipper of the California Sea Lion
08:53

A Robotic Platform to Study the Foreflipper of the California Sea Lion

Published on: January 10, 2017

7.4K

Area of Science:

  • Fluid dynamics
  • Biomimetic engineering
  • Microfluidics

Background:

  • Microorganisms use flexible appendages for locomotion and feeding in viscous environments.
  • Non-reciprocal motion of flexible filaments can generate propulsion or fluid pumping without inertia.

Purpose of the Study:

  • To propose and experimentally validate a strategy for macroscopic fluid pumping and mixing in creeping flow.
  • To investigate the role of flexibility in generating net fluid motion.

Main Methods:

  • Experimental measurement of fluid motion induced by a reciprocal flapper.
  • Comparison of fluid pumping by rigid versus flexible flappers.
  • Quantification of pumping effectiveness based on flapper geometry and fluid properties.

Main Results:

  • Rigid flappers induce no net fluid motion.
  • Flexible flappers generate significant net fluid pumping.
  • Optimal pumping is achieved when flapper length is comparable to the elasto-hydrodynamic penetration length.

Conclusions:

  • Flexibility is crucial for generating fluid pumping via reciprocal motion in viscous flows.
  • The elasto-hydrodynamic penetration length is a key parameter for optimizing flexible impeller performance.
  • This strategy has potential applications in macroscopic mixing operations at low Reynolds numbers.