Turbulent dispersed flows are ubiquitous in both industry and nature. The dispersion of pollutants in an urban environment, sediment transport or the fluidized catalytic cracking of carbohydrates are often studied. Flows of this kind are characterized by particles, droplets or bubbles dispersed within a carrier phase. The occurrence of such flows in pipes is large as well, with applications ranging from pneumatic conveying systems to chemical reactor design. This book aims at clarifying the behavior of this kind of flows.