MEASUREMENT OF DIRECT-CONTACT CONDENSATION OF PURE SATURATED VAPOR ONAN INJECTION SPRAY BY APPLYING PULSED LASER HOLOGRAPHY

An application of pulsed laser holography for direct measurement of th e growth of subcooled spray droplets in a pure saturated vapour is pre sented. The spray flow corresponds to intermediate and high droplet Re ynolds numbers (100 less-than-or-equal-to Re less-than-or-equal-to 350 0) while the vapour pressure is varied in a wide range of reduced pres sures (0.03 less-than-or-equal-to p(r) less-than-or-equal-to 0.3). The holographic reconstructions reveal a strong relation between the vapo ur pressure and the spray geometry. At moderate liquid flow rate and r elatively high vapour pressure, subsequent pressure increments produce dramatic changes in the spray geometry and considerably reduce the co ndensation rate.