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RTD studies in a falling film graphite evaporator with internal spiral fins: Influence of the geometry
Authors:Sbastien Bessenet  Viviane Renaudin  Jean‐Pierre Leclerc  Jean‐Marie Hornut
Affiliation:Sébastien Bessenet,Viviane Renaudin,Jean‐Pierre Leclerc,Jean‐Marie Hornut
Abstract:A hydrodynamic study of a new graphite evaporator has been performed. In this exchanger the fluid flows as a thin film on a spirally wound fin which forms a spiral staircase inside a tube. The slope θm of the spirally wound fin is modifiable. The residence time distribution (RTD) of the film was measured for different fin slopes θm and several film flowrates mf. The flow pattern was then modelled thanks to the DTS software as a cascade of perfect mixed cells and the mean residence time τm was calculated. The evolution of τm as a function of θm and mf is accurately represented by a power law relation.
Keywords:residence time distribution (RTD)  falling film  spiral fins  evaporators
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