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Related Concept Videos

Pipe Flowrate Measurement01:28

Pipe Flowrate Measurement

In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
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Fast Reactions01:27

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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
10:53

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Published on: March 12, 2019

Rate measurements by the pulsed-accelerated-flow method.

C P Bowers1, K D Fogelman, J C Nagy

  • 1Department of Chemistry, Purdue University, West Lafayette, Indiana 47907.

Analytical Chemistry
|June 7, 2011
PubMed
Summary
This summary is machine-generated.

A novel pulsed-accelerated-flow (PAF) spectrophotometer enables precise measurement of extremely fast chemical reactions, distinguishing them from mixing processes for accurate rate constant determination.

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Area of Science:

  • Chemical Kinetics
  • Spectrophotometry
  • Physical Chemistry

Background:

  • Accurate measurement of fast chemical reactions is crucial for understanding complex chemical processes.
  • Distinguishing chemical kinetics from physical mixing phenomena presents a significant challenge in rapid reaction studies.

Purpose of the Study:

  • To describe a pulsed-accelerated-flow (PAF) spectrophotometer for measuring very fast chemical reaction rate constants.
  • To develop methods for resolving chemical rate processes from physical mixing processes.

Main Methods:

  • Utilized a pulsed-accelerated-flow (PAF) spectrophotometer with UV-visible capability.
  • Varied flow velocities under turbulent flow conditions to differentiate mixing from reaction rates.
  • Developed models for two distinct mixing processes within the observation tube.

Main Results:

  • Achieved measurement of pseudo-first-order rate constants as high as 500,000 s⁻¹ (half-life of 1.4 μs).
  • Identified two mixing rate processes: one proportional to flow velocity, another to the square of flow velocity near inlet jets.
  • Demonstrated the PAF method's applicability to electron-transfer, proton-transfer, hydrolysis, and non-metal redox reactions.

Conclusions:

  • The developed PAF spectrophotometer and mixing models enable accurate kinetic measurements of very fast reactions.
  • The method effectively separates chemical reaction rates from physical mixing effects.
  • The PAF technique is versatile, applicable to various reaction types and orders.