Heat Transfer Study from a Salty Droplet Film on a Horizontal Tube in Mechanical Vapor Recompression Crystallization System

Yanmei Cao, Yu Wang, Yang Gao and Risto Kosonen
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Yanmei Cao: College of Urban Construction, Nanjing Tech University, Nanjing 211816, China
Yu Wang: College of Urban Construction, Nanjing Tech University, Nanjing 211816, China
Yang Gao: College of Urban Construction, Nanjing Tech University, Nanjing 211816, China
Risto Kosonen: College of Urban Construction, Nanjing Tech University, Nanjing 211816, China

Energies, 2022, vol. 15, issue 14, 1-15

Abstract: The horizontal drop film evaporator is a key component of the mechanical vapor recompression crystallization system, which can be used to evaporate effluent and recycle secondary vapor energy. However, the properties of heat transfer and flow of the salty effluent sprayed external of the horizontal drop film evaporation tube are obviously different from that of ordinary water. We established a 3D model for a horizontal drop film evaporator in the system, and water and sodium sulfate mixture were manufactured to reproduce the real salty effluent. By applying the VOF (volume of fluid) model, the liquid-gas interface of a salty effluent spray drop film formed on a horizontal tube in the evaporator was traced. The impacts of various heat flux, sodium sulfate content, spray density, and temperature on the local Nusselt number were studied, and a dimensionless correlation was established. The results showed that the effect of surface tension cannot be negligible; as the sodium sulfate content rises, the local Nusselt number declines in the thermal developing region; as the spray temperature and density rises, the local Nusselt number rises, which was largely independent of the heat flux in the thermal developing region.

Keywords: numerical simulation; spray drop film; local Nusselt number; salty effluent; mechanical vapor recompression system (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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