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

Dutkowski, Krzysztof; Fiuk, Jacek Jan

doi:10.1051/e3sconf/20187002005

Cited by 4 publications

(5 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The research procedure included the determination of the apparent viscosity of the slurries in the range of mPCM concentrations up to 43.0%, temperature ranges of T = 10 ÷ 50 °C, and shear rates of 𝛾̇ = 0.0132-132.00 s −1 . The details of the experiments are described in the works of the authors of [59][60][61][62]. Figure 2 presents exemplary results of measuring the apparent viscosity of the mPCM slurry as a function of the temperature and shear rate.…”

Section: The Mpcm Slurrymentioning

confidence: 99%

See 1 more Smart Citation

Experimental Studies of the Pressure Drop in the Flow of a Microencapsulated Phase-Change Material Slurry in the Range of the Critical Reynolds Number

Dutkowski,

Kruzel,

Kochanowska

2023

Energies

Self Cite

View full text Add to dashboard Cite

Phase-change materials (PCMs) are attractive materials for storing thermal energy thanks to the energy supplied/returned during the change in matter state. The encapsulation of PCMs prevent them from connecting into large clusters, prevents the chemical interaction of the PCM with the walls of the tank and the exchanger material, and allows the phase change to be initiated in parallel in each capsule. The microencapsulation of PCMs (mPCMs) and the nanoencapsulation of PCMs (nPCMs) entail that these particles added to the base liquid can act as a slurry used in heat exchange systems. PCM micro-/nanocapsules or mPCM (nPCM) slurry are subjected to numerous physical, mechanical, and rheological tests. However, flow tests of mPCM (nPCM) slurries are significantly limited. This paper describes the results of detailed adiabatic flow tests of mPCM slurry in a tube with an internal diameter of d = 4 mm and a length of L = 400 mm. The tests were conducted during laminar, transient, and turbulent flows (Re < 11,250) of mPCM aqueous slurries with concentrations of 4.30%, 6.45%, 8.60%, 10.75%, 12.90%, 15.05%, and 17.20%. The mPCM slurry had a temperature of T = 7 °C (the microcapsule PCM was a solid), T = 24 °C (the microcapsule PCM was undergoing a phase change), and T = 44 °C (the microcapsule PCM was a liquid). This work aims to fill the research gap on the effect of the mPCM slurry concentration on the critical Reynolds number. It was found that the concentration of the mPCM has a significant effect on the critical Reynolds number, and the higher the concentration of mPCM in the base liquid, the more difficult it was to keep the laminar flow. Additionally, it was observed that, as yet unknown in the literature, the temperature of the slurry (and perhaps the physical state of the PCM in the microcapsule) may affect the critical Reynolds number.

show abstract

Section: The Mpcm Slurrymentioning

confidence: 99%

“…γ = 0.0132-132.00 s −1 . The details of the experiments are described in the works of the authors of [59][60][61][62]. Figure 2 presents exemplary results of measuring the apparent viscosity of the mPCM slurry as a function of the temperature and shear rate.…”

Section: Test Stand and Test Proceduresmentioning

confidence: 99%

Experimental Studies of the Pressure Drop in the Flow of a Microencapsulated Phase-Change Material Slurry in the Range of the Critical Reynolds Number

Dutkowski,

Kruzel,

Kochanowska

2023

Energies

Self Cite

View full text Add to dashboard Cite

show abstract

“…The prepared sample was subjected to basic tests, the purpose of which was to determine its physical properties, including density and viscosity. The density of the suspension used for the tests ( Figure 1 ) was determined by the method described in detail by the authors in [ 23 ], and the viscosity ( Figure 2 ) by the method described in [ 20 , 21 , 22 ].…”

Section: Test Standmentioning

confidence: 99%

“…This work is part of our broader investigation of the thermodynamic and rheological properties of various MPCM suspensions. Previous research included dynamic viscosity [ 19 , 20 , 21 , 22 ], density [ 23 ], the specific heat and latent heat of fusion [ 24 , 25 ], and apparent thermal conductivity [ 26 ]. Here, we determine the pressure drop for a simple straight-pipe hydraulic system filled with MPCM slurry.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Physical State of Microencapsulated PCM on the Pressure Drop of Slurry in a Circular Channel

et al. 2022

Self Cite

View full text Add to dashboard Cite

Phase Change Material (PCM) is mainly used in thermal energy storage. The addition of small PCM particles to the working fluid circulating in the heat exchange systems allowed to increase the amount of transported energy thanks to the use of latent heat—the heat of phase change. Encapsulating PCM in microcapsules avoids the disadvantages of PCM emulsions and makes the resulting slurry an attractive heat energy carrier. The paper presents the effect of the aggregate state of PCM enclosed in microcapsules on the flow resistance of the slurry through a rectilinear tubular channel. The tests were carried out with the use of a tube with an internal diameter of 4 mm and a measuring section length of 400 mm. A slurry of 21.5 wt.% PCM microcapsules (MPCM) was used as the working fluid in distilled water. A slurry with temperatures of 18.4 °C (PCM encapsulated in a solid state), 26.1 °C (PCM is in a phase change), and 30.5 °C (PCM in a liquid state) flowed through the measuring section. The mass flow rate of the MPCM slurry reached 70 kg/h (Remax = 2150). It was shown that the higher the Re number, the higher the value of the flow resistance, and the more clearly this value depended on the temperature of the slurry. Detailed analyses indicate that the observed changes were not the result of a change in the viscosity of the slurry, but its density depending on the state of the PCM. Significant changes in the density of the slurry in the range of the phase transition temperature are the result of significant changes in the volume of the microcapsule containing the phase change material in different aggregate states.

show abstract

“…First, since the rate of heat transfer depends on the ratio of the surface area to the volume, the diameter of the channel or fluid passage must be reduced to increase the heat transfer coefficient. Secondly, improving the heat transfer fluid properties increases the heat transfer coefficient in heat exchangers 2,3 …”

Section: Introductionmentioning

confidence: 99%

Intelligent modeling of rheological and thermophysical properties of nanoencapsulated PCM slurry

Jirandeh

Mohammadiun

et al. 2020

Heat Trans

View full text Add to dashboard Cite

Nanoencapsulated phase change material slurries (NPCMS) combine properties of carried fluid and phase change material (PCM). Usage of NPCMS instead of water as a working fluid has a lot of advantages in many industrial fields. The costly and time-consuming determination of thermophysical properties of NPCMS through the experimental analysis led the current investigations to use soft computing methods like correlating, artificial neural network (ANN), and ant colony optimization (ACO R ). In this study, the application of ANN, empirical correlations, and ACO R for modeling the thermophysical properties of NPCM slurry, which has been synthesized through a facile and eco-friendly procedure, has been investigated. PCM nanocapsules have been synthesized using a miniemulsion polymerization method. Nancapsules consist of AP-25 as core and a Styrene shell, which is modified with graphene oxide nanosheets as an extra protective screen.The morphology and thermal properties of nanocapsules were characterized and analyzed, respectively. Results revealed that minimum average particle-size values result in a melting latent heat of 146.8 J/g. In case of NPCM slurry, the results showed that the thermal conductivity of MPCS decreased with particle concentration for the temperatures below the melting point. The NPCMS can be considered a Newtonian fluid within the test region (shear rate > 200/seconds and mass fraction < 0.25). The ANN-ACO R model consists of two neurons in the input layer, six neurons in the hidden layer, and two neurons in the output layer. The input layer consists of two nodes (PCM concentration and temperature) that correspond to parameters found essential and sufficient for thermophysical properties prediction. Upon comparison, the results show that the presented model, which is a combination of the ACO R algorithm and an artificial neural network, is compatible with experimental work. K E Y W O R D SANN modeling, ant colony, phase change material, slurry, thermophysical properties

show abstract

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

Cited by 4 publications

References 28 publications

Experimental Studies of the Pressure Drop in the Flow of a Microencapsulated Phase-Change Material Slurry in the Range of the Critical Reynolds Number

Experimental Studies of the Pressure Drop in the Flow of a Microencapsulated Phase-Change Material Slurry in the Range of the Critical Reynolds Number

Influence of the Physical State of Microencapsulated PCM on the Pressure Drop of Slurry in a Circular Channel

Intelligent modeling of rheological and thermophysical properties of nanoencapsulated PCM slurry

Contact Info

Product

Resources

About