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We investigate the temperature aspects of evaporating salt droplets by studying the nucleation and deposition dynamics through an infrared (IR) camera. Two different salt types were used for this purpose: NaCl and MgSO4, both with 1 M initial concentration. Crystallization is an exothermic process, and we found such evidence in both cases, where the crystals were 0.50–1.50 °C hotter than the solution itself. However, in the case of NaCl, a relatively colder region was observed surrounding the growing crystals, which is fascinating in its own aspect. With the other salt type, no such surrounding colder region was observed, but here, the deposition was extremely fast compared to the NaCl case. We believe that these findings would improve the understanding of connected phase change systems as well as the available models.

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Thermal Insights into Evaporation-Induced Deposition in 1 M NaCl and MgSO4 Droplets

  • 会议论文

  • 发表日期：

    2025年

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  • Shivani Chauhan,
  • Navneet Kumar

摘要

We investigate the temperature aspects of evaporating salt droplets by studying the nucleation and deposition dynamics through an infrared (IR) camera. Two different salt types were used for this purpose: NaCl and MgSO4, both with 1 M initial concentration. Crystallization is an exothermic process, and we found such evidence in both cases, where the crystals were 0.50–1.50 °C hotter than the solution itself. However, in the case of NaCl, a relatively colder region was observed surrounding the growing crystals, which is fascinating in its own aspect. With the other salt type, no such surrounding colder region was observed, but here, the deposition was extremely fast compared to the NaCl case. We believe that these findings would improve the understanding of connected phase change systems as well as the available models.