Single Bubble Heat Transfer in Saturated Pool Boiling of Fc-72

A study of single bubbles growing on a microscale heater array kept at nominally constant temperature was performed. The heater array consisted of 96 heaters each nominally 0.27 mm × 0.27 mm in size. The heater temperatures were kept constant using electronic feedback loops similar to those used in hot-wire anemometry, and the power required to do this was measured throughout the bubble departure cycle for each heater in the array. Data were obtained at a wall superheat of 22.5 °C during saturated pool boiling of FC-72. Bubbles were observed to nucleate from a single site on the surface at this temperature. Evaluation of various heat transfer models are made.