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Heat transfer enhancement to enlarge the operating range enables a more efficient use of thermosiphon reboilers. For this purpose, the use of wire matrix inserts in thermosiphon reboilers was studied experimentally and via simulation. The boiling of water/glycerol as a wide boiling mixture with an elevated viscosity was investigated at a sub-atmospheric pressure of 0.2 bar abs and a submergence of 110%. With varied driving temperature differences, single-phase reboiler inlet velocities from 0.01 m·s -1  to 0.16 m · s -1  were induced coupled with heat fluxes ranging from 1 kW·m -2  to 22 kW·m -2 . By using inserts, the reboiler showed significant improvement of fluid dynamics and thermal performance and could be operated at lower temperature differences. The simulation confirmed the advantageous usage of inserts. However, the heat transfer was underestimated possibly resulting from the neglected subcooled boiling and deficits in the flow boiling model for the wide-boiling mixture at low pressures.

Simulation of Thermosiphon Reboilers Using Wire Matrix Inserts at Lower Operating Range