A printed collection of 78 full-length, peer-reviewed technical papers. Topics include 30th Symposium on Fluid Machinery; Erosion, Slurry, Sedimentation; 18th Symposium on Experimental, Multiscale, and Numerical Methods for Multiphase Flows; Gas-Liquid, Gas-Solid, and Liquid-Solid Flows; Performance of Multiphase Flow Systems; and more.