Photography in bubble and drop research



Methods of photographing bubbles and drops moving in a liquid field are described. Shape, size, terminal velocity, local semi-vectorial velocities, size distribution and high speed phenomena such as coalescence and breakup can be advantageously investigated by photographic methods. Recommended combinations of lights, reflectors, diffusers, screens, films, and f-stop values are given. Applications of particle trace and interrupted particle trace photography are described.