Abstract
The laser Rayleigh scattering technique was applied for the time and space resolved measurements of vapor concentration around a sphere of liquid fuel or freon evaporating in a vertically upward free stream of dust-free dry air with uniform velocity and temperature profiles. The Rayleigh signal from a minute volume of vapor air mixture subjected to the monochromatic radiation of a focused argon laser was collected by the optical detection system. A peak in the lateral distribution of the time-averaged vapor concentration was observed at a location off the central axis of the flow in the wake behind the sphere. The longitudinal vapor concentration profile was fairly uniform except in the vicinity of the sphere. A rise in air velocity caused a decrease in the boundary layer thickness while the vapor concentration remained almost unchanged. The vapor concentration increased with an increase in air temperature and volatility of liquid.
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