Experimental study on natural convective heat transfer of tube immersed in microencapsulated phase change material suspensions

Wang, Liang; Zhang, Jian; Wang, Yifei; Lin, Xipeng; Xie, Ningning; Chen, Haisheng

doi:10.1016/j.applthermaleng.2016.01.102

Cited by 34 publications

(8 citation statements)

References 19 publications

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“…It is observed that when increasing the shear rate, the apparent viscosity decreases to the Newtonian plateau, where the viscosity seems to be constant. This shear-thinning behaviour has also been found in the majority of the works in this field found in the literature [5][6][7]12,13]. Fig.…”

Section: Resultssupporting

confidence: 75%

“…In a paper by Wang et al [6] experimental research on the natural convective heat transfer with microencapsulated phase change material suspensions is described. The microencapsulated PCM slurry was formulated with PCM powder with N-hexadecane as the core material and a diameter range of 10 ÷ 40 μm.…”

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%

“…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]. The viscosities of slurries rose with the increase of the mass fraction of microcapsules up to several dozen times [5][6][7][8][12][13][14][15].…”

Section: Previous Study On Mpcm Slurry Viscositymentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 75%

Section: Previous Study On Mpcm Slurry Viscositymentioning

confidence: 99%

Section: Previous Study On Mpcm Slurry Viscositymentioning

confidence: 99%

Section: Previous Study On Mpcm Slurry Viscositymentioning

confidence: 99%

See 2 more Smart Citations

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

Dutkowski

Fiuk

2018

E3S Web Conf.

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“…Such fluids have the potential to increase the rate of heat transfer. The use of phase change materials (PCMs) is one of the new techniques that have recently been used to improve the thermal performance of converters as well as energy storage 7‐9 . Latent heat and the use of phase‐shift materials is one of the best ways to save energy and reduce the consumption of available resources and prevent energy loss.…”

Section: Introductionmentioning

confidence: 99%

Intelligent modeling of rheological and thermophysical properties of nanoencapsulated PCM slurry

Jirandeh

Mohammadiun

et al. 2020

Heat Trans

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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

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A review on the applications of micro-/nano-encapsulated phase change material slurry in heat transfer and thermal storage systems

Ghoghaei

Mahmoudian

Mohammadi

et al. 2020

J Therm Anal Calorim

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Experimental study on natural convective heat transfer of tube immersed in microencapsulated phase change material suspensions

Cited by 34 publications

References 19 publications

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

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

Intelligent modeling of rheological and thermophysical properties of nanoencapsulated PCM slurry

A review on the applications of micro-/nano-encapsulated phase change material slurry in heat transfer and thermal storage systems

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