EFFECTS OF SURFACTANTS (NH4CL) BEHAVIORS ON NUCLEATE POOL BOILING OVER NIC H ROME WIRE

The heat transfer in boiling can be enhanced byadding small amount of addit ive in fluid. Addition of small amount of additive in the fluid c hanges the physical behavior of the boiling phenomenon. Sur factant changes thermo - physical properties of the fluid. E xperiments on pool boiling were carried in presence of the surfa ctant in p ure water with an aim to enhance heat transfer in pool boiling by addition of surfactants. Ammonium Ch loride (NH4Cl) is taken as test surfactant and added s eparately in water with varying concentration. The results of surfactant NH4Cl in pure water showed the heat transfer enhancement and above this range no enhancement was observed. Al so the trend of boiling curves in presence of this s urfactant in the water, shifted towards the lower excess temp erature side. Kinetics of vapor bubble in pool boiling ph enomena for pure water with and without surfactant was observed in terms of bubble nuc leation, growth and its departure.