Intercomparative tests on viscosity measurements of phase change materials

Delgado, Mónica; Lázaro, Ana; Biedenbach, Michael; Gamisch, Sebastian; Gschwander, Stefan; Höhlein, Stephan; König-Haagen, Andreas; Brüggemann, Dieter

doi:10.1016/j.tca.2018.08.017

Cited by 13 publications

(6 citation statements)

References 15 publications

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“…As for DSC, also rheological analysis shows a thermal hysteresis between melting and solidification processes that depends on the temperature ramp imposed during the experiment [35,36]. Similar results were obtained performing a set of intercomparative tests with different rheometers on octadecane [37] and on RT25 paraffin [38].…”

Section: Introductionmentioning

confidence: 56%

Thermo-physical characterization of Hexadecane during the solid/liquid phase change

et al. 2022

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Section: Introductionmentioning

confidence: 56%

Thermo-physical characterization of Hexadecane during the solid/liquid phase change

et al. 2022

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“…Previous experiments performed with a standard oil in the parallel plate configuration showed a deviation from the certified viscosity value of 8% at 80ºC as a result of the temperature gradient within the sample with a gap of 645 μm [22]. Lower gaps would reduce this temperature gradient.…”

Section: Rheological Measurementsmentioning

confidence: 91%

Triggering and acceleration of xylitol crystallization by seeding and shearing: Rheo-optical and rheological investigation

Delgado

Navarro

Lázaro

et al. 2021

Solar Energy Materials and Solar Cells

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The present study investigates the triggering and acceleration of xylitol crystallization for its use as a short-term TES. The combined effect of seeding and the action of shear on xylitol crystallization at a supercooled temperature has been investigated by direct observations under shear (rheo-optical approach) and by rheometry. The initial seed is an agglomerate of crystals of xylitol. In addition to the more classical erosion and rupture mechanisms leading to the dispersion of crystals, shear has shown to induce the detachment of crystalline dust adhered to the initial seed into the supercooled xylitol. These crystal fragments then serve as sites for secondary nucleation and subsequent crystallization. Rheo-optical observations have allowed the determination of shear conditions to control the size of crystals by dispersion. A second part has been dedicated to the effect of shear on crystallization of xylitol by seeding by means of rheology. The measurements, although not reproducible, clearly show that seeding in presence of shear (for the investigated conditions) is very efficient to trigger and accelerate the crystallization of xylitol. Post-mortem DSC and XRPD analyses of the final crystallized seeded and sheared samples have not shown any effect on the xylitol crystallinity degree.

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Section: Literature Review Of Thermophysical Properties Of Octadecanementioning

confidence: 99%

“…The majority of researchers have determined the viscosity of octadecane with rotational rheometers (RR) [28,84,85,98]. Results of our own measurements with a translational rheometer (TR), the so called IMETER, are included in the publication of Delgado et al [98]. Hogenboom et al [99] and Ducoulombier et al [100] have applied falling-body viscometers (FV) and Dover and Hensley [63] used an Ostwald capillary viscometer (CV).…”

Section: Literature Review Of Thermophysical Properties Of Octadecanementioning

confidence: 99%

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Review of Thermophysical Property Data of Octadecane for Phase-Change Studies

et al. 2019

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In this work we derive temperature-dependent functions for the most important material properties needed for phase change studies with octadecane. Over 80 references are reviewed in which at least one thermophysical property of octadecane is measured. The functions are valid ±40 K around the melting temperature and are surrounded by their confidence interval. It turns out that the values for the solid phase have much broader confidence intervals than the ones of the liquid phase. Hence, more accurate measurements are particularly desirable for the solid state material properties.

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Intercomparative tests on viscosity measurements of phase change materials

Cited by 13 publications

References 15 publications

Thermo-physical characterization of Hexadecane during the solid/liquid phase change

Thermo-physical characterization of Hexadecane during the solid/liquid phase change

Triggering and acceleration of xylitol crystallization by seeding and shearing: Rheo-optical and rheological investigation

Review of Thermophysical Property Data of Octadecane for Phase-Change Studies

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