The interaction of inertial particles and droplets in turbulent gas flow has been investigated with two experiments. In the first experiment, a spray of inertial droplets impinged on a solid particle target, in surrounding turbulent gas which was both homogeneous and isotropic. The growth rate of liquid film, which formed on the target, was quantified and compared to characteristics of the spray. The liquid growth rate was found to vary linearly with the frequency of droplet collisions on the target. The formation of ‘clusters’, observed in the spray using Vorono¨ı analysis, was found to lead to temporal variations to the liquid growth rate. In the second experiment, a rig was designed to investigate the interaction of inertial particles in a stagnating region of turbulent gas flow. The formation of ‘clusters’ were observed using box counting and Vorono¨ı analysis, and their importance discussed relative to spray drying.