Publication Date

Fall 2023

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

Advisor

Farzan Kazemifar; Sang-Joon Lee; Crystal M. Han

Abstract

In this thesis the use of Laser-Induced Fluorescence (LIF) thermometry was evaluated as a temperature measurement for multiphase flow in porous media. This optical temperature measurement technique utilizes the temperature-dependent emissive properties of fluorescent dyes to measure temperature. This research evaluates the accuracy, spatial resolution, and temporal resolution of LIF thermometry compared to existing temperature measurements. In this research water-soluble and oil-soluble fluorescent dyes are evaluated in terms of their temperature sensitivity. The ability of these dyes to measure temperature is compared to an Ansys FEA simulation of a fixed temperature gradient. For multiphase flow, the fluorescent dyes were both simultaneously measured within the porous media micromodel and distinguished by the cameras based on their differing fluorescence response for two cameras. The results of this research determined that the technique was able to produce a spatial resolution of (5.2 μm)2, a temporal resolution allowing for a complete measurement to be taken in 4.5 seconds, and a root-mean-square error of at most 4.30 °C and at beast a root-mean-square error of 1.62 °C. While the spatial resolution of the technique is much greater than most existing temperature measurements, the accuracy of the temperature measurement must be greatly improved for this technique to be practical.

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