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Comment PDF Heat Transfer

Heat Transfer in Wiped Film Evaporators

By Daniel Bethge |

Simulations demonstrate the complex, changing properties of materials within the evaporator. Such information can help in both designing and selecting the proper evaporator A wiped film or agitated thin-film evaporator is very effective with difficult-to-handle materials. The evaporator consists essentially of a sealed cylinder that is provided with a heating jacket. The feed material is distributed on the inside as a thin film by means of a mechanical system. Due to the heating and the applied vacuum, the volatile components are evaporated and liquefied in an external condenser. In a short-path still, the condenser is fixed concentrically inside of the evaporator, so that a distillation at fine or even high vacuum is possible. A special version of the film evaporator is the horizontal dryer, where the material is conveyed with special conveyor elements through the evaporator. The non-evaporative components are pumped as a residue or discharged as powdery solids. The evaporation process is mainly heat transfer controlled. For a simulation, the evaporator is advantageously divided into several zones. Using a database that is stored in simulation programs, heat transfer coefficients and temperature differences for each section can…
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