ABSTRACT
Fluids are integral part of almost in all the unit operations, namely mechanical transport, heat transfer and mass transfer. Its behaviour and flow properties are applied in designing of several physical and chemical processes. Motion of fluids through pipes and conduits is a subject matter of fluid dynamics, and the properties related to stagnant fluids are dealt in fluid statistics. Treatments or analyses of flow behaviour, friction and pumping of Newtonian and non-Newtonian liquids are quite similar to the classical operations in chemical engineering. However, because of some different intrinsic and extrinsic characteristics of foods, there might be some variation in the classical approaches. In addition to that, handling food fluids requires utmost care for extraneous contamination. Flow of highly viscous mass through extruder die of different geometries is common industrial practice for the preparation of shaped products. Flow of fluids in food processing includes single- or two-phase systems.
