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Journal of Materials Science

, Volume 55, Issue 7, pp 2994–3004 | Cite as

Supercooling characteristics of mannitol phase transition system under heterogeneous nucleation

  • Jun Ji
  • Yinghui Wang
  • Xuelai ZhangEmail author
  • Yue Chen
  • Jotham Muthoka Munyalo
  • Sheng Liu
Energy materials
  • 25 Downloads

Abstract

Supercooling of phase change materials (PCMs) during solidification is a major problem in cold thermal energy storage (CTES), which reduces energy efficiency and aggravates energy waste. This study focuses on the supercooling characteristics of PCMs under heterogeneous nucleation, which provides a new idea for researching the influence of different dispersants on the supercooling degree of aqueous solution. The optimal ratios of CNTs water dispersant (TNWDIS) and polymer polyacrylic acid sodium (PAAS) to multi-walled carbon nanotubes (MWCNTs) in mannitol aqueous solution are determined through microstructure and cooling characteristics. How these two surfactants and MWCNTs with different concentrations and particle sizes influence the supercooling degree of nanofluids are investigated. The results indicate that the effect of PAAS is greater than that of TNWDIS. Furthermore, under the action of two dispersants and particle sizes of MWCNTs, the fitting equations of supercooling changing with the concentration of MWCNTs are obtained. In the light of the heterogeneous nucleation theory, with the enlargement of the particle size and the diminution of the contact angle affected by the dispersants, the interfacial free energy of heterogeneous nucleation of PCMs on the surface of nanoparticles is reduced. The supercooling degree therefore decreases. Specifically, the nucleation mechanism is deduced and analyzed through the contact angle and nucleation free energy formula.

Abbreviations

MWCNT

Multi-walled carbon nanotube

PCM

Phase change material

PAAS

Polymer polyacrylic acid sodium

CTES

Cold thermal energy storage

SAT

Sodium acetate trihydrate

MWCNF

Multi-walled carbon nanofluid

SDBS

Sodium dodecylbenzene sulfonate

SEM

Scanning electron microscope

TNWDIS

Carbon nanotubes water dispersant

Symbols

ΔT

Supercooling degree (°C)

C

Mass concentration (%)

R

Radius (m)

θ

Contact angle (°)

ΔG

Interfacial free energy (mN m−1)

σ

Free surface energy (mN m−1)

ρ

Density (kg m−3)

H

Latent heat of fusion (kJ kg−1)

Notes

Acknowledgements

This work was financially supported by National Key Research and Development Project (2018YFD0401305); National Natural Science Foundation of China (51376115); and Shanghai Science and Technology Commission Project (16040501600).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Cool Storage TechnologyShanghai Maritime UniversityShanghaiChina
  2. 2.Beijing Vegetable Research Center, Academy of Agriculture and Forestry SciencesBeijingChina

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