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The influence of measurement methods with some measuring conditions on droplet coalescence and solution were experimentally investigated to measure the droplet size more accurately by the immersion liquid method. In the case of the sedimentation method, the experimental result shows that captured droplets coalesce and dissolve even in the immersion liquid as well as on its surface. It was also found that the solution of captured droplets into the immersion liquid considerably decreases by interrupting its surface from the air. Moreover, the influence of the immersion liquid viscosity on the droplet coalescence can be neglected within the very short shutter opening period (TS ≤ 103ms) irrespective of the sedimentation method or the hanging one. So, it is desirable to measure the droplet size as soon as possible after the droplets were completely immersed into the low viscosity immersion liquid, to prevent the effects of the droplet coalescence and solution into the immersion liquid.

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