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Investigation on crystallization of TiO2–water nanofluids and deionized water

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  • Mo, Songping
  • Chen, Ying
  • Jia, Lisi
  • Luo, Xianglong

Abstract

Two titania–water (TiO2–water) nanofluids were prepared by dispersing TiO2 nanoparticles in rod shapes (rutile TiO2) and in spherical shapes (anatase TiO2) into deionized water. The effect of the TiO2 nanoparticles on the crystallization behaviors of the nanofluids were investigated using differential scanning calorimetry (DSC). The weight fraction of the TiO2 nanoparticles was 0.05%, 0.30% and 0.70%. The experimental results show that in the cooling rate range of 1.5–9.0°C/min, the nanofluids with rutile TiO2 nanoparticles had higher crystallization temperatures compared with deionized water and the nanofluids with anatase TiO2 nanoparticles, and the heat of crystallization of the rutile TiO2 nanofluid was larger than that of the anatase TiO2 nanofluid. It is found that the rutile TiO2 nanofluid is more suitable than the anatase TiO2 nanofluid for ice storage system under the experimental conditions. Moreover, some unexpected data were obtained, which show that the shapes of the crystallization temperature curves of the nanofluids were like symbols of inverse “N” at 0.5–9.0°C/min, and that the crystallization temperatures of some of the nanofluids were lower than that of the deionized water at low cooling rates. The mechanisms for the unusual phenomenon were discussed.

Suggested Citation

  • Mo, Songping & Chen, Ying & Jia, Lisi & Luo, Xianglong, 2012. "Investigation on crystallization of TiO2–water nanofluids and deionized water," Applied Energy, Elsevier, vol. 93(C), pages 65-70.
    • Handle: RePEc:eee:appene:v:93:y:2012:i:c:p:65-70
    DOI: 10.1016/j.apenergy.2011.07.014
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    References listed on IDEAS

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    1. Jegadheeswaran, S. & Pohekar, Sanjay D., 2009. "Performance enhancement in latent heat thermal storage system: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(9), pages 2225-2244, December.
    2. Lin, Cherng-Yuan & Wang, Jung-Chang & Chen, Teng-Chieh, 2011. "Analysis of suspension and heat transfer characteristics of Al2O3 nanofluids prepared through ultrasonic vibration," Applied Energy, Elsevier, vol. 88(12), pages 4527-4533.
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    8. Yiamsawas, Thaklaew & Mahian, Omid & Dalkilic, Ahmet Selim & Kaewnai, Suthep & Wongwises, Somchai, 2013. "Experimental studies on the viscosity of TiO2 and Al2O3 nanoparticles suspended in a mixture of ethylene glycol and water for high temperature applications," Applied Energy, Elsevier, vol. 111(C), pages 40-45.
    9. Colangelo, Gianpiero & Favale, Ernani & de Risi, Arturo & Laforgia, Domenico, 2013. "A new solution for reduced sedimentation flat panel solar thermal collector using nanofluids," Applied Energy, Elsevier, vol. 111(C), pages 80-93.

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