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Related Concept Videos

Gradually Varying Flow01:29

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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...
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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Uniform Depth Channel Flow: Problem Solving01:18

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To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
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Rapidly Varying Flow01:24

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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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Updated: Aug 23, 2025

Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing
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High-Performance Directional Water Transport Using a Two-Dimensional Periodic Janus Gradient Structure.

Dongdong Xie1,2, Bao Yue Zhang3, Guilian Wang4

  • 1National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Shanghai Jiao Tong University, Shanghai, 200240, China.

Small Methods
|October 30, 2022
PubMed
Summary

Researchers developed a 2D periodic Janus gradient structure for high-speed, long-range directional liquid transport. This novel system significantly improves water transport distance and velocity, overcoming previous limitations.

Keywords:
bioinspirationcomprehensively-improved transport performancedirectional water transportperiodic Janus gradient structureswater complex manipulation

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Area of Science:

  • Surface science
  • Fluid dynamics
  • Materials science

Background:

  • Micro/nanoscale hierarchical structures with surface gradients enable directional liquid transport.
  • Achieving both high-speed and long-range liquid transport concurrently remains a challenge.

Purpose of the Study:

  • To develop an improved approach for high-speed and long-range directional liquid transport.
  • To investigate the efficacy of a 2D periodic Janus gradient structure for water manipulation.

Main Methods:

  • Design and fabrication of a 2D periodic Janus gradient structure inspired by natural examples (desert beetle, cacti spine, Nepenthes alata).
  • Analysis of liquid transport kinetics within the confined structure, focusing on terminal potential wells and topological features.
  • Evaluation of droplet velocity, transport distance, and volume loss under high-flux conditions.

Main Results:

  • Achieved averaged water droplet velocity exceeding 400 mm/s.
  • Reached a maximum normalized transport distance of 23.4 for a 3 µL droplet.
  • Demonstrated ultralow liquid volume loss (6.02%) during high-flux water transport.

Conclusions:

  • The 2D periodic Janus gradient structure efficiently regulates liquid transport kinetics for sustained, long-distance propulsion.
  • The system's design facilitates rapid aqueous film formation, ensuring high initial momentum and fast transport.
  • This scalable and fabricable system offers a promising pathway for high-performance water manipulation with diverse applications.