Basic Fluid Mechanics

Basic Fluid Mechanics What are the two general states in fluid mechanics? - CORRECT ANSWER-Liquids and gasses What is a fluid? - CORRECT ANSWER-a collection of molecules in constant motion. What is density? - CORRECT ANSWER-the amount of matter in an object What is specific gravity? - CORRECT ANSWER-the ratio of density to water What is specific volume? - CORRECT ANSWER-the reciprocal of density What is dynamic viscosity? - CORRECT ANSWER-the friction between the molecule and an object What is kinematic viscosity? - CORRECT ANSWER-friction between molecules What are the fluid Principles? - CORRECT ANSWER-Conservation of Mass, Conservation of Momentum, Conservation of energy What is conservation of mass? - CORRECT ANSWER-mass can neither be created nor destroyed What is conservation of momentum? - CORRECT ANSWER-the total momentum of a collision is conserved, the momentum is a constant or unchanging value What are 3 general factors of fluid mechanics? - CORRECT ANSWER-1)Viscid (friction) vs. inviscid (frictionless) 2) Compressible vs. in compressible 3)Static vs. dynamic (moving) What are the flow regimes? - CORRECT ANSWER-stead, laminar, unsteady, turbulent, transition What is steady flow? - CORRECT ANSWER-a flow in which conditions may change from point to point but do not change with time What is laminar flow? - CORRECT ANSWER-When there is a streamline flow in parallel layers, no eddies What is unsteady flow? - CORRECT ANSWER-a flow in which conditions may change from point to point and do change with time What is turbulent flow? - CORRECT ANSWER-flow in which the velocity at any point varies erratically, and has magnified eddies What is transition flow? - CORRECT ANSWER-between laminar and turbulent What does it mean if an Rε2000? - CORRECT ANSWER-Laminar flow What does it mean if 2000Rε4500? - CORRECT ANSWER-laminar or turbulent What does it mean if Rε4500? - CORRECT ANSWER-Turbulent What is the equation to figure out Reynolds number? - CORRECT ANSWER-Rε=(velocity×size)÷kinematic viscosity Rε=(v×d)÷u What are the equations which define fluid flow called? - CORRECT ANSWER-Navier-Stokes Equations