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Guo F, Xu Z, Gu J. Effects of nano-fumed silica and carbonyl iron powder of different particle sizes on the rheological properties of shear thickening fluids. Colloid Polym Sci 2023. [DOI: 10.1007/s00396-023-05087-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2023]
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McPhee H, Soni V, Saber S, Zargartalebi M, Riordon J, Holmes M, Toews M, Sinton D. Rheological Behavior of Phase Change Slurries for Thermal Energy Applications. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:129-141. [PMID: 36574262 DOI: 10.1021/acs.langmuir.2c02279] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Phase change materials that leverage the latent heat of solid-liquid transition have many applications in thermal energy transport and storage. When employed as particles within a carrier fluid, the resulting phase change slurries (PCSs) could outperform present-day single-phase working fluids─provided that viscous losses can be minimized. This work investigates the rheological behavior of encapsulated and nonencapsulated phase change slurries (PCSs) for applicability in flowing thermal energy systems. The physical and thermal properties of the PCS candidates, along with their rheological behavior, are investigated below and above their phase transition points at shear rates of 1-300 s-1, temperatures of 20-80 °C, and concentrations of 15-37.5 wt %. The effect of shell robustness and melting on local shear thickening and global shear thinning is discussed, followed by an analysis of the required pumping power. A hysteresis analysis is performed to test the transient response of the PCS under a range of shear rates. We assess the complex viscoelastic behavior by employing oscillatory flow tests and by delineating the flow indices─flow consistency index (K) and flow behavior index (n). We identify a viscosity limit of 0.1 Pa·s for optimal thermal performance in high-flow applications such as renewable geothermal energy.
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Affiliation(s)
- Hannah McPhee
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada
| | - Vikram Soni
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada
| | - Sepehr Saber
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada
| | - Mohammad Zargartalebi
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada
| | - Jason Riordon
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada
| | - Michael Holmes
- Eavor Technologies Inc., Calgary, Alberta T2P 3H9, Canada
| | - Matthew Toews
- Eavor Technologies Inc., Calgary, Alberta T2P 3H9, Canada
| | - David Sinton
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada
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Kawaguchi M. Dispersion stability and rheological properties of silica suspensions in aqueous solutions. Adv Colloid Interface Sci 2020; 284:102248. [PMID: 32916455 DOI: 10.1016/j.cis.2020.102248] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 08/20/2020] [Accepted: 08/20/2020] [Indexed: 11/29/2022]
Abstract
This historical perspective overviews the dispersion stability and rheological properties of fumed and colloidal silica suspensions in aqueous solutions as a function of the volume fraction of silica (ϕ) (where ϕ is ≤0.1). The silica suspensions exist in a gel state at lower ϕ in acidic conditions than at alkaline pH. The steady-state shear viscosities of silica suspensions at acid conditions exhibit shear thinning behavior at lower ϕ than in alkaline conditions; the magnitudes of the dynamic moduli of the silica suspensions at acidic pH are larger than those at alkaline pH. Changes in the dispersion stability and rheological behavior of the silica suspensions may be attributable to the addition of salt, which decreases electrostatic repulsion. Furthermore, the effects of polymer adsorption on the dispersion stability and rheological behavior of hydrophilic or hydrophobic silica suspensions are discussed.
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Affiliation(s)
- Masami Kawaguchi
- Graduate School of Engineering, Mie University, 1577 Kurimamachiya, Tsu, Mie 514-8507, Japan.
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Kawaguchi M. Dispersion stabilities and rheological properties of fumed silica suspensions. J DISPER SCI TECHNOL 2016. [DOI: 10.1080/01932691.2016.1185952] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Masami Kawaguchi
- Laboratory of Colloid Rheology, Division of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Japan
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Warren J, Offenberger S, Toghiani H, Pittman CU, Lacy TE, Kundu S. Effect of Temperature on the Shear-Thickening Behavior of Fumed Silica Suspensions. ACS APPLIED MATERIALS & INTERFACES 2015; 7:18650-18661. [PMID: 26237541 DOI: 10.1021/acsami.5b05094] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Shear-thickening fluids (STFs) can be subjected to a significant temperature variation in many applications. Polymeric or oligomeric fluids are commonly used as suspending media for STFs. Because the viscosities of polymeric fluids are strongly temperature-dependent, large temperature changes can profoundly affect the shear-thickening responses. Here, the effect of temperature on the shear-thickening behavior of four low-molecular-weight polymeric glycols/fumed silica suspensions is reported. The dispersed-phase volume fraction, its surface chemistry, and the chemical compositions of the suspending media were varied. These factors influence the viscosity and the interactions between the suspended particles and the suspending media. Fumed silica particles with two different silanol-group surface densities were suspended in the polymeric glycols, where these silanol surface groups formed hydrogen bonds with the suspending media's glycols and internal oxygen atoms. Steady-shear experiments were performed over a temperature range spanning approximately 100 °C. The critical shear rate for the onset of shear thickening decreased with decreasing temperature. The critical shear rates were inversely proportional to the viscosity of the pure suspending media over these same temperature ranges. The response of STFs to varying both the temperature and shear rate investigated here will help to design application-specific STFs. Mitigation of a hypervelocity (6.81 km/s) impact on an aluminum facesheet sandwich composite filled with one of these STFs was demonstrated.
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Affiliation(s)
- Justin Warren
- Department of Aerospace Engineering, ‡Dave C. Swalm School of Chemical Engineering, and §Department of Chemistry, Mississippi State University , MS State, Mississippi 39762, United States
| | - Sean Offenberger
- Department of Aerospace Engineering, ‡Dave C. Swalm School of Chemical Engineering, and §Department of Chemistry, Mississippi State University , MS State, Mississippi 39762, United States
| | - Hossein Toghiani
- Department of Aerospace Engineering, ‡Dave C. Swalm School of Chemical Engineering, and §Department of Chemistry, Mississippi State University , MS State, Mississippi 39762, United States
| | - Charles U Pittman
- Department of Aerospace Engineering, ‡Dave C. Swalm School of Chemical Engineering, and §Department of Chemistry, Mississippi State University , MS State, Mississippi 39762, United States
| | - Thomas E Lacy
- Department of Aerospace Engineering, ‡Dave C. Swalm School of Chemical Engineering, and §Department of Chemistry, Mississippi State University , MS State, Mississippi 39762, United States
| | - Santanu Kundu
- Department of Aerospace Engineering, ‡Dave C. Swalm School of Chemical Engineering, and §Department of Chemistry, Mississippi State University , MS State, Mississippi 39762, United States
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