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Related Concept Videos

Introduction to Types of Flows01:23

Introduction to Types of Flows

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Fluid flows are categorized by dimensionality and behavior, with one-dimensional flow being the simplest form, where properties like velocity and pressure change only along a single axis. Water moving through straight pipes exemplifies this flow type, as variations in other directions are minimal. One-dimensional analysis helps simplify understanding such flows, focusing solely on changes along the pipe's length.
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Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
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Signal Flow Graphs01:18

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Signal-flow graphs offer a streamlined and intuitive approach to representing control systems, providing an alternative to traditional block diagrams. These graphs use branches to symbolize systems and nodes to represent signals, effectively illustrating the relationships and interactions within the system.
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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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Power flow problem analysis is fundamental for determining real and reactive power flows in network components, such as transmission lines, transformers, and loads. The power system's single-line diagram provides data on the bus, transmission line, and transformer. Each bus k in the system is characterized by four key variables: voltage magnitude Vk​, phase angle δk​, real power Pk​, and reactive power Qk​. Two of these four variables are inputs, while the...
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Related Experiment Video

Updated: Jul 9, 2025

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
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Next generation of flow analysis is based on flow programming.

Jaromir Jarda Ruzicka1, Petr Chocholouš2

  • 1Department of Oceanography, University of Hawaii, 1000 Pope Road, Honolulu, HI, 96822, USA.

Talanta
|November 30, 2023
PubMed
Summary

A new programmable Flow Injection (pFI) method offers advanced capabilities beyond traditional Segmented Flow Analysis (SFA) and Flow Injection Analysis (FIA). This lab-on-valve system enables unique functions like auto-calibration and flow-batch analysis for nutrient determination.

Keywords:
Automated calibration by single standard solutionLab-on-valveProgrammable flow analysisSchlieren effectSea waterSpectrophotometry

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Area of Science:

  • Analytical Chemistry
  • Environmental Science

Background:

  • Segmented Flow Analysis (SFA) and Flow Injection Analysis (FIA) are established techniques for automated chemical analysis.
  • Limitations exist in SFA and FIA regarding complex operations and calibration procedures.

Purpose of the Study:

  • To introduce and evaluate a novel programmable Flow Injection (pFI) system.
  • To compare the performance of pFI with SFA and FIA.
  • To demonstrate the capabilities of pFI for complex analytical tasks.

Main Methods:

  • Development of a miniaturized lab-on-valve platform for programmable Flow Injection (pFI).
  • Implementation of advanced flow programming for versatile analytical operations.
  • Application of pFI for nutrient determination in seawater samples.

Main Results:

  • The pFI system successfully performed tasks not achievable with conventional SFA/FIA.
  • Demonstrated auto-calibration using a single standard solution.
  • Validated flow-batch analysis mode simulating manual batch techniques.
  • Accurate nutrient determination in seawater samples was achieved.

Conclusions:

  • Programmable Flow Injection (pFI) represents a significant advancement in flow analysis.
  • The lab-on-valve pFI system offers enhanced flexibility and automation capabilities.
  • pFI is a powerful tool for environmental analysis, particularly for nutrient determination.