A comprehensive review of hydrodynamic mechanisms and heat transfer characteristics for microencapsulated phase change slurry (MPCS) in circular tube

Yang, Liu; Liu, Shuli; Zheng, Hongfei

doi:10.1016/j.rser.2019.109312

Cited by 54 publications

(20 citation statements)

References 104 publications

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“…In this investigation, the C 16 OH:C 20 OH and C 16 OH:SiO 2 ratios were fixed at 9:1 and 49:1, respectively. No further contents of the nucleating agents were considered to avoid important reductions of latent heat and further rises in dynamic viscosity (in the case of samples containing silica nanoparticles) [39,79]. Regarding C 16 OH + C 20 OH/W emulsions (see Figure 3e,f), the fatty alcohol proved to be a good nucleating agent to trigger heterogeneous nucleation.…”

Section: Phase Change Chracteristicsmentioning

confidence: 99%

Development and Thermophysical Profile of Cetyl Alcohol-in-Water Nanoemulsions for Thermal Management

Cabaleiro

Losada‐Barreiro

Agresti

et al. 2021

Fluids

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This study focuses on the preparation, thermophysical and rheological characterization of phase change material nanoemulsions as latent functionally thermal fluids. Aqueous dispersions with fine droplets of cetyl alcohol (with a melting temperature at ~321 K) were prepared by means of a solvent-assisted method, combining ultrasonication with non-ionic and anionic emulsifiers. Eicosyl alcohol (melting at ~337 K) and hydrophobic silica nanoparticles were tested as nucleating agents. Droplet size studies through time and after freeze–thaw cycles confirmed the good stability of formulated nanoemulsions. Phase change analyses proved the effectiveness of eicosyl alcohol to reduce subcooling to a few Kelvin. Although phase change material emulsions exhibited thermal conductivities much larger than bulk cetyl alcohol (at least 60% higher when droplets are solid), reductions in this property reached 15% when compared to water. Samples mainly showed desirable Newtonian behavior (or slight shear thinning viscosities) and modifications in density around melting transition were lower than 1.2%. In the case of phase change material nanoemulsions with 8 wt.% content of dispersed phase, enhancements in the energy storage capacity overcome 20% (considering an operational temperature interval of 10 K around solid–liquid phase change). Formulated dispersions also showed good thermal reliability throughout 200 solidification–melting cycles.

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Section: Phase Change Chracteristicsmentioning

confidence: 99%

Development and Thermophysical Profile of Cetyl Alcohol-in-Water Nanoemulsions for Thermal Management

Cabaleiro

Losada‐Barreiro

Agresti

et al. 2021

Fluids

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“…LFTFs can be used not only as a heat store, but also as a heat carrier in heat-exchange systems. The main advantages of using mPCM/nPCM slurries in heat-exchange systems include the possibility of reducing the amount of working fluid, the diameter of the channels, the heat-exchange surface of the exchangers, or the amount of energy required to pump the fluid [ 12 , 13 ]. Numerous tests have been carried out to determine the flow-resistance or heat-transfer coefficients [ 14 , 15 , 16 ] during the flow of mPCM and nPCM slurries in pipe minichannels.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Apparent Thermal Conductivity of Microencapsulated Phase-Change-Material Slurry at the Phase-Transition Temperature

Dutkowski

Kruzel

2021

Materials

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The article presents the results of detailed studies of the thermal conductivity of the water slurry of microencapsulated PCM (mPCM) and slurry based on water–propylene glycol solutions. The starting product, MICRONAL® 5428 X, which contains about 43% microencapsulated paraffin with a transformation temperature of 28 °C, was mixed with the base liquid to obtain slurries with mass fractions of mPCM of 4.3, 8.6, 12.9, 17.2, 21.5, 25.8, 30.1, 34.4, 38.7, and 43.0%. Detailed measurements were carried out in the temperature range of 10–40 °C. It was found that: (a) an increase in the temperature of the slurry caused an increase in its thermal conductivity, both when PCM was in the form of a solid and a liquid; (b) the thermal conductivity of the mPCM slurry when the PCM was in liquid form was greater than the thermal conductivity of the slurry when the PCM was liquid; (c) during the phase transformation, a significant increase in the thermal conductivity of the slurry was observed, and its peak occurred when the temperature of the slurry reached the temperature declared by the manufacturer at which the phase-transition peak occurs.

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“…[10] The use of latent functional thermal fluids (LFTF) offers a promising solution for the effective usage of solar energy. [11][12][13] By mixing working fluid and phase change materials (PCMs), the present LFTF has better performance than the traditional working medium, [14][15][16][17] such as high-density thermal energy storage, high-speed transportation of high-density thermal energy, enlargement of available temperature range, reduction in heat loss and down-size of equipment, and so on.…”

Section: Introductionmentioning

confidence: 99%

Microencapsulation of Molten Salt in Titanium Shell for High‐Temperature Latent Functional Thermal Fluid

Wang

et al. 2020

Energy Tech

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Herein, a water‐limited sol–gel method is applied to fabricate microencapsulated phase change materials (MEPCMs) which have a sodium nitrate (NaNO3) core and a titanium dioxide (TiO2) shell. The MEPCM has a high melting temperature of 306.5 °C and a solidification temperature of 296.7 °C, which shows a potential usage as a high‐temperature compatible thermal storage medium for industrial waste heat recovery and concentrated solar power (CSP). The MEPCM is demonstrated to be thermally stable for 200 thermal cycles with a high latent heat of 135.3 J g−1. The high‐temperature latent functional thermal fluid (HT‐LFTF) is prepared by dispersing the NaNO3@TiO2 MEPCMs into thermal oil. The test results show that MEPCMs provide an 18.4% effective thermal conductivity enhancement and 131.7% effective specific heat enhancement compared with base thermal oil. The rheological test indicates that the MEPCMs added in the thermal oil enhance the viscosity of the suspension and it increases with the MEPCM concentration. This work provides a new type of thermal oil–based functional thermal fluid containing high‐temperature MEPCM and paves the way for the application of LFTF in high‐temperature heat storage and transfer.

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A comprehensive review of hydrodynamic mechanisms and heat transfer characteristics for microencapsulated phase change slurry (MPCS) in circular tube

Cited by 54 publications

References 104 publications

Development and Thermophysical Profile of Cetyl Alcohol-in-Water Nanoemulsions for Thermal Management

Development and Thermophysical Profile of Cetyl Alcohol-in-Water Nanoemulsions for Thermal Management

Experimental Investigation of the Apparent Thermal Conductivity of Microencapsulated Phase-Change-Material Slurry at the Phase-Transition Temperature

Microencapsulation of Molten Salt in Titanium Shell for High‐Temperature Latent Functional Thermal Fluid

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