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The Diffusion of Passive Tracers in Laminar Shear Flow
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Tomographic Absorption Spectroscopy for H2O Transport in a Laminar Jet with Inverse Concentration Gradient.

Kin-Pang Cheong1, Dingfeng Shi1, Shaotong Liu1

  • 1School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China.

Sensors (Basel, Switzerland)
|August 26, 2022
PubMed
Summary

Tomographic absorption spectroscopy (TAS) visualized water vapor transport in a laminar jet. This technique accurately mapped concentration gradients, demonstrating its potential for studying mass transfer in gas flows.

Keywords:
diffusionlaminar jet flowspecies transporttomographic absorption spectroscopy (TAS)tunable diode laser absorption spectroscopy (TDLAS)

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Area of Science:

  • Fluid Dynamics
  • Spectroscopy
  • Mass Transfer

Background:

  • Understanding water vapor transport in laminar jets is crucial for various industrial and environmental applications.
  • Previous methods for visualizing scalar fields in such flows have limitations in spatial resolution and accuracy.

Purpose of the Study:

  • To develop and validate a tomographic absorption spectroscopy (TAS) method for quantitatively studying water vapor transport in a laminar jet.
  • To experimentally determine the 2D distribution of water concentration within a dry laminar jet and analyze concentration gradients.

Main Methods:

  • Generation of a stable laminar jet using compressed dry air, a honeycomb, and a nozzle.
  • Implementation of a TAS scheme utilizing the 1368.598 nm absorption line of water vapor.
  • One-dimensional tomographic measurements at various heights, validated against computational fluid dynamics (CFD) simulations.

Main Results:

  • Successful experimental acquisition of the 2D water concentration distribution in the laminar jet.
  • Accurate capture of concentration gradient variations within the shear layer at different heights.
  • Validation of TAS results against CFD predictions, confirming the method's reliability.

Conclusions:

  • Tomographic absorption spectroscopy (TAS) is a powerful and promising technique for researching mass transfer and scalar fields in gaseous flows.
  • The study successfully demonstrated TAS's capability to provide detailed, quantitative insights into complex flow phenomena.
  • The findings highlight TAS as a valuable tool for both experimental research and computational fluid dynamics model validation.