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  1. Ultra-fast solidification of phase change materials using the injection of a boiling fluid
Ultra-fast solidification of phase change materials using the injection of a boiling fluid
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Ultra-fast solidification of phase change materials using the injection of a boiling fluid

Ranjbar Kermani, J

Ultra-fast solidification of phase change materials using the injection of a boiling fluid

Ranjbar Kermani, J ; Sharif University of Technology | 2024

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijheatmasstransfer.2024.125697
  3. Publisher: 2024
  4. Abstract:
  5. Despite their outstanding properties, phase change materials (PCMs) possess low thermal conductivity, decelerating their phase change processes and restricting their applications in energy storage and thermal management units. Accordingly, an ingenious method is suggested based on boiling heat transfer to exceedingly precipitate the solidification rate of PCMs. In this approach, a jet of boiling fluid (BF) is injected into the molten PCM. Acetone and paraffin are selected as the BF and PCM, respectively. Once reaching the molten paraffin, the acetone boils inside the paraffin and solidifies it quickly. Additionally, the BF jet induces striking vortices inside the container, enhancing mixing. Furthermore, given the severe interplay between the acetone jet and molten paraffin, the jet is susceptible to disturbances and eventually atomizes into minuscule droplets, enlarging the heat exchange area. All mechanisms contribute to ultra-fast solidification of PCM. The impacts of volume flow rate, paraffin height in the container, initial temperature of the molten paraffin, and nozzle diameter are investigated on the temperature distribution, phase change process, released energy, and Nusselt number. The results demonstrate that the influence of the acetone flow rate is more pronounced. Also, the solidification time of this study is compared with several surveys that employed conventional methods. Contemplating the results, this technique curtails the solidification time by three orders of magnitude and 36 times compared to pure PCMs without additives and the ordinary direct contact method, respectively. Moreover, this method can solidify 0.3 L of molten paraffin in merely 18 s under the optimum condition. © 2024
  6. Keywords:
  7. Boiling ; Acetone ; Additives ; Containers ; Energy storage ; Heat transfer ; Paraffins ; Solidification ; Thermal conductivity ; Boiling heat transfer ; Jet breakup ; Low thermal conductivity ; Management unit ; Phase change process ; Property ; Rate of phase change ; Solidification rate ; Solidification time ; Ultra-fast ; Phase change materials
  8. Source: International Journal of Heat and Mass Transfer ; Volume 229 , 2024 ; 00179310 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0017931024005283