Thermophysical behavior of phase change slurries in the presence of charged particles

Saber, Sepehr; Zargartalebi, Mohammad; Soni, Vikram; McPhee, Hannah; Roostaie, Mohammad; Darzi, Alireza; Riordon, Jason; Holmes, Michael; Toews, Matthew; Sinton, David

doi:10.1016/j.colsurfa.2022.129967

Cited by 2 publications

(2 citation statements)

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“…Saber et al found that the nonionic surfactants do not electrostatically stabilize the dispersed phase but cause a steric repulsion, which causes the dispersed phase to be meta-stabilized. 34 The carrier fluid for all slurries was deionized water. PCSs and mPCS were prepared with 15, 22.5, 30, 37.5, and 45 wt % PCM; the ratios used are indicated in Table 1.…”

Section: ■ Experimental Methodsmentioning

confidence: 99%

“…Nonionic surfactants, Span80 and Tween 80 (poly(oxyethylene) sorbitan monooleate), were purchased from Sigma-Aldrich and blended in a 2:3 ratio. Saber et al found that the nonionic surfactants do not electrostatically stabilize the dispersed phase but cause a steric repulsion, which causes the dispersed phase to be meta-stabilized . The carrier fluid for all slurries was deionized water.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Rheological Behavior of Phase Change Slurries for Thermal Energy Applications

et al. 2022

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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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Section: ■ Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%