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Residence time of liquid in a thin layer evaporator equipped with a spiral element

The Chemical Engineering Journal and the Biochemical Engineering Journal
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Abstract A new apparatus for conservative evaporation of thermally sensitive liquids is thoroughly examined. The application of a spiral element in a static type thin layer evaporator (STLE) enables controlled extension of the residence time of liquid inside the evaporator, and consequently a controlled degree of evaporation. The residence time distribution of a tracer injected into a falling-water film on the outside of a cylindrical tube is measured by the impulse response method. A total of 221 measurements are performed using an STLE and a TLE equipped with spiral elements of two different pitches. On the basis of experimental data, detailed correlations are elaborated which express relationships between the mean residence time t̃ and dimensional moduli of Reynolds and Froude numbers

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