ABSTRACT
Flow boiling heat transfer in a single vertical channel of cross-section 1 mm × 2 mm has been studied experimentally using high speed video photography of bubble behaviour and simultaneous recording of the wall temperature by liquid crystal thermography. The conditions for the recordings so far obtained are flow rate 85 kg m-2 s-1 of water at 1 atm., inlet temperature 98 °C, heat flux 29 to 109 kW m-2 in a channel of heated length 140 mm. The bubble boundaries, contours of wall temperature, heat flux and heat transfer coefficient as well as local temperature-time curves can be obtained by this technique. Some preliminary results are given to illustrate the capabilities of the technique for investigating mechanisms of heat transfer.
