ME-223 Fluid Mechanics - I B.Sc Mechanical Engineering Credit hours – 3+0 Lecture – 1 Introduction to Fluid Mechanics and Basic Concepts Department of Mechanical Engineering, Wah Engineering College University of Wah DILATANT • This fluid is shear thickening, increasing its resistance with increasing strain rate. • Examples : Quick sand, which stiffens up if one thrashes out. PSEUDOPLASTIC • A shear thinning fluid , which is less resistant at higher strain rates. A very strong thinning is called plastic. • Examples: Polymer solutions, paper pulp in water, latex paint, blood plasma, syrup and molasses. • The classic case is paint, which is thick when poured but thin when brushed at a high strain rate. BINGHAM PLASTIC • The limiting case of a plastic substance is one that required a finite yield stress before it begins to flow. • Examples: Clay suspensions, drilling mud, toothpaste , mayonnaise, chocolate and mustard. • The classic case is ketchup, which will not come out of the bottle until you stress it by shaking.