Experimental technique for concentration measurement using Magnetic Resonance Imaging

Mathur Sekar, Abhisheka

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https://hdl.handle.net/2142/124463 Copy

Description

Title

Experimental technique for concentration measurement using Magnetic Resonance Imaging

Author(s)

Mathur Sekar, Abhisheka

Issue Date

2024-05-03

Director of Research (if dissertation) or Advisor (if thesis)

Villafane Roca, Laura

Department of Study

Aerospace Engineering

Discipline

Aerospace Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

Dynamic Calibration, Magnetic Resonance Concentration, Magnetic Resonance Imaging, Reference Concentration

Abstract

This master’s thesis introduces a thorough methodology for employing Magnetic Resonance Imaging (MRI) to conduct Magnetic Resonance Concentration (MRC) based analysis. This technique is designed to acquire three-dimensional, time-averaged concentration fields in complex turbulent flows, eliminating the need for optical access. Such an approach is particularly advantageous in studying how different fluid streams mix, providing valuable insights into a range of applications from jet engine film cooling to urban dispersion scenarios. The core of this study involves the meticulous selection of MRI scan settings, choice of fluids, and calibration procedures, which are crucial for accurately capturing the dynamics of mixing fluids. The research outlines a systematic investigation through the execution of three distinct scanning sequence, each tailored to meet specific objectives contributing to the comprehensive analysis of concentration fields. Initially, a static calibration is conducted using fifteen vials, each filled with a different concentration of CuSO4. This step is critical for determining the optimal scan parameters providing optimal signal to noise ratio, establishing baseline data that inform the settings for subsequent dynamic calibrations. During these dynamic calibrations, flow conditions are simulated within the test section to ascertain the reference concentration levels of CuSO4. Flip angles of 35º and 45º, derived from the static calibration, are employed to enhance the balance between signal-to-noise ratio, dynamic range, linear range and spatial resolution in the MRI results. The results from the dynamic calibration, established the reference and reference high concentrations of 0.01M and 0.045M CuSO4 respectively, underpin the main scans. These scans are detailed meticulously, covering logistics, experimental setups, and methodological frameworks. By providing this comprehensive methodological foundation, the thesis sets the stage for future research in fluid dynamics using Magnetic Resonance Imaging, paving the way for further explorations and analyses. The findings from the main MRC scans, which remain to be fully analyzed, promise to contribute significantly to our understanding of fluid mixing processes in various engineering and environmental contexts.

Graduation Semester

2024-05

Type of Resource

Thesis

Copyright and License Information

Copyright 2024 Abhisheka Mathur Sekar

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