Effects of nanoparticles and sample containers on crystallization supercooling degree of nanofluids

Mo, Songping; Chen, Ying; Cheng, Zhengdong; Jia, Lisi; Luo, Xianglong; Shao, Xuefeng; Xiao, Yuan; Lin, Gang

doi:10.1016/j.tca.2015.02.006

Cited by 15 publications

(13 citation statements)

References 27 publications

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“…The results are in accordance with previous studies of nanoparticle effects on the PCTs of water-based nanofluids [14,17,[19][20][21][22][23][24][25]. For the nanofluids with 12% and 22% EG, no remarkable differences (less than 0.6°C) between the PCT of the TiO 2 -EG-H 2 O nanofluids and that of the corresponding EG solution were observed.…”

Section: Phase Change Temperature and Nucleation Temperaturesupporting

confidence: 92%

“…The PCT of the three groups of solutions are around À5, À10, and À20°C, respectively. Nanofluids were prepared by dispersing the TiO 2 nanoparticles in aqueous EG solutions by using a two-step method [14,15,18,22,25,31]. [39].…”

Section: Preparation Of Nanofluidsmentioning

confidence: 99%

“…They were obtained through freezing experiments [14,15,17,[19][20][21][22][23][24][25]27]. They were obtained through freezing experiments [14,15,17,[19][20][21][22][23][24][25]27].…”

Section: Phase Change Characterizationmentioning

confidence: 99%

“…Nanoparticles investigated included Al 2 O 3 [14,25], TiO 2 [16,18,25], CuO [16,19], Cu [20], carbon nanotubes [17,21,27], graphene [22,27,28], and graphene oxide [23,24]. Nanoparticles investigated included Al 2 O 3 [14,25], TiO 2 [16,18,25], CuO [16,19], Cu [20], carbon nanotubes [17,21,27], graphene [22,27,28], and graphene oxide [23,24].…”

Section: Introductionmentioning

confidence: 99%

“…Nanofluids are obtained by dispersing nanoparticles in a conventional base liquid and have been considered as a new type of PCMs. Previous results revealed that adding nanoparticles to base liquid enhances the thermal conductivity and thermal performance [8][9][10][11][12][13], reduces the SD and freezing (solidification) time [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], and possibly reduces the equipment size required for CTES systems [7].…”

Section: Introductionmentioning

confidence: 99%

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Phase change characteristics of ethylene glycol solution-based nanofluids for subzero thermal energy storage

Zhu

Yin

et al. 2016

Int. J. Energy Res.

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Summary Nanofluids, particularly water‐based nanofluids, have been extensively studied as liquid–solid phase change materials (PCMs) for thermal energy storage (TES). In this study, nanofluids with aqueous ethylene glycol (EG) solution as the base fluid are proposed as a novel PCM for cold thermal energy storage. Nanofluids were prepared by dispersing 0.1–0.4 wt% TiO2 nanoparticles into 12, 22, and 34 vol.% EG solutions. The dispersion stability of the nanofluids was evaluated by Turbiscan Lab. The liquid–solid phase change characteristics of the nanofluids were also investigated. Phase change temperature (PCT), nucleation temperature, and half freezing time (HFT) were investigated in freezing experiments. Subcooling degree and HFT reduction were then calculated. Latent heat of solidification was measured using differential scanning calorimetry. Thermal conductivity was determined using the hot disk thermal constant analyzer. Experimental results show that the nanoparticles decreased the PCT of 34 vol.% EG solution but minimally influenced the PCT of 12 and 22 vol.% EG solutions. For all nanofluids, the nanoparticles decreased the subcooling degree, HFT, and latent heat but increased the thermal conductivity of the EG solutions. The mechanism of the improvement of the phase change characteristics and decrease in latent heat by the nanoparticles was discussed. The nanoparticles simultaneously served as nucleating agent that induced crystal nucleation and as impurities that disturbed the growth of water crystals in EG solution‐based nanofluids. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Phase Change Temperature and Nucleation Temperaturesupporting

confidence: 92%

Section: Preparation Of Nanofluidsmentioning

confidence: 99%

“…They were obtained through freezing experiments [14,15,17,[19][20][21][22][23][24][25]27]. They were obtained through freezing experiments [14,15,17,[19][20][21][22][23][24][25]27].…”

Section: Phase Change Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase change characteristics of ethylene glycol solution-based nanofluids for subzero thermal energy storage

Zhu

Yin

et al. 2016

Int. J. Energy Res.

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Preparation and Characterization of Erythritol/Graphene Oxide Shape‐Stable Composites with Improved Thermal‐Physical Property

Wang

Zhang

et al. 2019

ChemistrySelect

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In order to improve thermal-physical properties of erythritol (ET), two kinds of shape-stabilized phase change materials (SSPCMs) were fabricated and the effects of graphene oxide (GO), carboxymethyl cellulose (CMC) on supercooling degree and heat release performance of ET were discussed. The results revealed that the encapsulated ET displays excellent shape stability and slightly improved thermal-physical performance, while the capsules containing 0.7 wt% CMC exhibit significant enhancement in thermal-physical properties. The optimal composites, with ET content as high as 97 wt%, melt at 121.9°C with latent heat of 316.8 J g À 1 and freeze at 104.0°C with enthalpy of 295.1 J g À 1 . The heat release percentage increased to 93.2% and the supercooling degree decreased to 17.9°C due to the heterogeneous nucleation of GO and the inhibition of CMC on components separation. Also, the two composites present similar core-shell-like structure, excellent thermal reliability and stability during repeated utilization. In a word, GO can be used as shell to improve thermal conductivity and prevent leakage while CMC can be employed to relax the supercooling degree of ET.

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Influence of clay nanoparticles on hindering the undesirable solidification process

Aslani

Moghiman

2019

Heat Mass Transfer

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Effects of nanoparticles and sample containers on crystallization supercooling degree of nanofluids

Cited by 15 publications

References 27 publications

Phase change characteristics of ethylene glycol solution-based nanofluids for subzero thermal energy storage

Phase change characteristics of ethylene glycol solution-based nanofluids for subzero thermal energy storage

Preparation and Characterization of Erythritol/Graphene Oxide Shape‐Stable Composites with Improved Thermal‐Physical Property

Influence of clay nanoparticles on hindering the undesirable solidification process

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