Performance characteristics of microencapsulated phase change material slurry in a helically coiled tube

Kong, Minsuk; Alvarado, Jorge L.; Terrell, Wilson; Thies, Curt

doi:10.1016/j.ijheatmasstransfer.2016.05.047

Cited by 64 publications

(20 citation statements)

References 37 publications

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“…Some rheological studies on PCM nano-emulsions [4,5,9,13,[15][16][17] or suspensions containing micro-encapsulated PCMs [18][19][20][21] also analyzed changes in dynamic viscosity occurring during the solidifyication/melting of phase change material droplets/micro-capsules. Most of those investigations observed deformations in shear viscosity-temperature evolution at temperatures around solid-liquid transitions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Viscosity, Surface Tension and Wetting Behavior Studies of Paraffin–in–Water Nano–Emulsions

et al. 2019

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This work analyzes the dynamic viscosity, surface tension and wetting behavior of phase change material nano–emulsions (PCMEs) formulated at dispersed phase concentrations of 2, 4 and 10 wt.%. Paraffin–in–water samples were produced using a solvent–assisted route, starting from RT21HC technical grade paraffin with a nominal melting point at ~293–294 K. In order to evaluate the possible effect of paraffinic nucleating agents on those three properties, a nano–emulsion with 3.6% of RT21HC and 0.4% of RT55 (a paraffin wax with melting temperature at ~328 K) was also investigated. Dynamic viscosity strongly rose with increasing dispersed phase concentration, showing a maximum increase of 151% for the sample containing 10 wt.% of paraffin at 278 K. For that same nano–emulsion, a melting temperature of ~292.4 K and a recrystallization temperature of ~283.7 K (which agree with previous calorimetric results of that emulsion) were determined from rheological temperature sweeps. Nano–emulsions exhibited surface tensions considerably lower than those of water. Nevertheless, at some concentrations and temperatures, PCME values are slightly higher than surface tensions obtained for the corresponding water+SDS mixtures used to produce the nano–emulsions. This may be attributed to the fact that a portion of the surfactant is taking part of the interface between dispersed and continuous phase. Finally, although RT21HC–emulsions exhibited contact angles considerably inferior than those of distilled water, PCME sessile droplets did not rapidly spread as it happened for water+SDS with similar surfactant contents or for bulk–RT21HC.

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Section: Introductionmentioning

confidence: 99%

Dynamic Viscosity, Surface Tension and Wetting Behavior Studies of Paraffin–in–Water Nano–Emulsions

et al. 2019

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“…PCM microcapsules slurry has all the benefits of PCM suspension, without coalescing problem due to the shells preventing the contact between PCM droplets [146]. ere are many research and review papers on characterization of thermal/rheological properties for PCM microcapsules [147][148][149][150].…”

Section: Slurrymentioning

confidence: 99%

Phase Change Material (PCM) Microcapsules for Thermal Energy Storage

Peng

Dou

et al. 2020

Advances in Polymer Technology

173

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Phase change materials (PCMs) are gaining increasing attention and becoming popular in the thermal energy storage field. Microcapsules enhance thermal and mechanical performance of PCMs used in thermal energy storage by increasing the heat transfer area and preventing the leakage of melting materials. Nowadays, a large number of studies about PCM microcapsules have been published to elaborate their benefits in energy systems. In this paper, a comprehensive review has been carried out on PCM microcapsules for thermal energy storage. Five aspects have been discussed in this review: classification of PCMs, encapsulation shell materials, microencapsulation techniques, PCM microcapsules’ characterizations, and thermal applications. This review aims to help the researchers from various fields better understand PCM microcapsules and provide critical guidance for utilizing this technology for future thermal energy storage.

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“…Kong et al [5] used mPCM slurries produced by Thies Technology Inc. as heat transfer fluids. The phase change material (PCM) used in the study was butyl stearate.…”

Section: Previous Study On Mpcm Slurry Viscositymentioning

confidence: 99%

“…Generally, the mPCM slurry is considered as a Newtonian fluid when the mass fraction of mPCM is up to 30% [4][5][6]8,9] or when the shear rate is large enough [3]. After adding additives such as surfactant agents, the mPCM slurry stopped behaving as a non-Newtonian fluid and started behaving as a Newtonian fluid [10,11].…”

Section: Previous Study On Mpcm Slurry Viscositymentioning

confidence: 99%

Experimental investigation on influence of microcapsules with PCM on propylene glycol rheological properties

Dutkowski

Fiuk

2018

E3S Web Conf.

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This paper details an experimental study that was performed to investigate rheological properties of microencapsulated phase change slurry - mPCM (Micronal® DS 5039 X and ERGOLID EKO®- an aqueous solution of propylene glycol). Seven samples of mPCM slurry were prepared with different mass ratio of the Micronal® to the ERGOLID EKO®: 30:70, 40:60, 50:50, 60:40, 70:30, 80:20 and 90:10. The apparent viscosity-shear rate curves were obtained for spindle speed from 0.01 to 100 rpm (shear rate 0.0132 to 132.00 s-1 respectively). The steady state measurement of viscosity was carried out when the slurry reached constant temperatures, namely: 10.0; 15.0, 17.5, 20.0, 22.5, 25.0, 27.5, 30.0, 40.0 and 50.0°C. The apparent viscosity of slurries increases with the mPCM concentration in dispersion rises. Only the sample of 30% Micronal® may be considered as a Newtonian fluid within the test range. Increasing the shear rate ultimately causes apparent viscosity to decrease down to the Newtonian plateau, where it seems to be constant. The variation of the viscosity as a function of temperature and microcapsules concentration was accurately represented by a modified Vogel-Tamman-Fulcher equation at a mean absolute error (MAE) of 10.76%.

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Performance characteristics of microencapsulated phase change material slurry in a helically coiled tube

Cited by 64 publications

References 37 publications

Dynamic Viscosity, Surface Tension and Wetting Behavior Studies of Paraffin–in–Water Nano–Emulsions

Dynamic Viscosity, Surface Tension and Wetting Behavior Studies of Paraffin–in–Water Nano–Emulsions

Phase Change Material (PCM) Microcapsules for Thermal Energy Storage

Experimental investigation on influence of microcapsules with PCM on propylene glycol rheological properties

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