ABSTRACT
Fluid can be defined as a substance which experiences endless motion and deformation. It flows in response to an externally applied shear stress and continues to do so until the shear stress is removed. Understanding of fluid flow phenomenon is important for food process engineers to design fluid transport systems in industries. Fluids encountered in a process industry can be classified as liquids and gases. In turn, liquids can be categorized as thin liquids and thick liquids. In a food industry, thin liquids include water, juices and milk; thick liquids comprise honey, oil and jams and steam is the predominant form of gas used. While liquids are pumped from one location to another, steam is distributed to the entire processing plant through pipelines. The scope of this chapter is to explain the concepts of fluid flow along with the governing laws and principles.
