Date of Award

12-2023

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical and Civil Engineering

First Advisor

Darshan G. Pahinkar, Ph.D.

Second Advisor

M. Toufiq Reza, Ph.D.

Third Advisor

Anand Balu Nellippallil, Ph.D.

Fourth Advisor

Ashok Pandit, Ph.D., P.E.

Abstract

The viscosity of adsorbent slurries is pivotal in understanding their rheological behavior, yet, the research on adsorbent slurry viscosity has been limited. This study addresses this gap by analyzing porous and non-porous solutes' behavior in solvents and then applying it to the washcoating adsorbents on ceramic substrates. By examining MIL-101 (Cr), glass beads, silica nanoparticles, and Titania, the study aims to comprehend the viscosity variations of each solute in the solvents, water and ethanol. A key observation from this study was the significant role of wetting in determining viscosity, as initial results found that MIL-101 (Cr) exhibited the highest viscosity in water-based slurries. In contrast, in ethanol slurry, glass beads exhibited the highest viscosity, which could be attributed to the low contact angle between ethanol and glass beads. Based on these and several more findings, a semi-empirical model was formulated using the Buckingham π theorem, which showed similar values for viscosity and was validated for up to 30% volume fraction. Moreover, shear thinning behavior was consistently observed across all experiments, which enhances the application based on these slurries.

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