Different forms of evaporation in an externally heated pipe Features - demonstration of evaporation in a double-wall pipe evaporator made of glass - operation with harmless, special low boiling point liquid Learning objectives/experiments - observation of typical forms of evaporation -- single phase liquid flow -- sub-cooled boiling -- slug flow -- annular flow -- film boiling -- dispersed flow -- single phase vapour flow -- wet steam - effect on the evaporation process by -- flow rate -- temperature -- pressure Specification [1] visualisation of evaporation in a tube evaporator [2] heating and cooling medium: water [3] water supply via the lab network or via WL 110.20 Water chiller to ensure a maximum water temperature of 16°C [4] tube evaporator made of double-wall glass [5] heating circuit with heater, pump and expansion vessel [6] safety valve protects against overpressure in the system [7] water jet pump to evacuate the evaporation circuit [8] refrigerant R1233zd, GWP: 1 Technical data Heater - power rating: 2kW - temperature range: 5...80°C Heating and cooling medium: water Pump - 3 stages - max. flow rate: 1,9m3/h - max. head: 1,5m - power consumption: 58W Tube evaporator - length: 1050mm - inner diameter: 16mm - outer diameter: 24mm Condenser: coiled tube made of copper Refrigerant - R1233zd - GWP: 1 - filling volume: 1,2kg - CO2-equivalent: 0t Measuring ranges - pressure: -1...1,5bar rel. - temperature: 0...100°C 230V, 50Hz, 1 phase 230V, 60Hz, 1 phase 120V, 60Hz, 1 phase UL/CSA optional LxWxH: 1250x800x1970mm Weight: approx. 170kg
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