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To study heat transfer coefficients in dropwise & filmwise condensation, glass cylinder at the top of which two condensers hang and steam inlet at bottom, water is circulated through the condensers from common inlet.Transparent glass cylinder allows visualization of condensation process. Rotameter for water flow, Pressure gauge for steam pressure, temp. indicator for various temperatures.

To study of boiling heat transfer. A nichrome wire immersed in water and heated by passing current through it. input to nichrome wire, controlled by dimmer stat. Increasing wire input current increases & at critical heat flux the wire brakes. It is measured on meter. Magnifying glass and lamp to visualise natural connection and pool boiling and separate heater coil in water allows for various water temperature.

To study visualization of two phase of liquid viz. boiling & condensation. Liquid R-11 in which a hot cylinder is immersed. Boiling of liquid, observed over heater surface upto nucleate boiling phase. Condenser coil at the top of cylinder. Vapor is condensed to liquid. Measurements- pressure of vapor-pressure gauge, water flow-Rotameter, Control of heater surface temp.-Dimmer & Liquid temp.-thermometers.