flow

Question 1

laminar flow

Answer 1

fluid passes smoothly along path, velocity at centre twice speed of average, velocity at edge nearly zero. described by hagen poiseuille equation. F= (pie.p.R to the 4)/8nl

Question 2

turbulent flow

Answer 2

flow not parellel to sides of tube, reynolds >2000

Reynolds = (density.velocity.diameter)/viscoscity

Question 3

bernoulli principle

Answer 3

increased flow velocity of an ideal fluid has proportional decrease in its pressure

Question 4

venturi effect

Answer 4

when tube narrows, velocity increases so pressure decreases. Keeps total flow the same.Pressure drop can entrain other fluids

Question 5

Law of conservation of energy

Answer 5

first law of thermodynamics

- if kinetic energy (velocity)increases, potential energy (pressure) decreases - bernoulli principle

Question 6

Coanda effect

Answer 6

Tendency of stream of fluid flowing in proximiity to convex surface to follow the line of the surface rather than its original course. Means fluid flows down one limb of Y junction

Question 7

jet entrainment

Answer 7

high speed gas, eg oxygen, will drag air with it due to frictional forces created by fast moving molecues. Total entrained flow due to Bernoulli effect and jet entrainment. Entrainment ratio is entrained air:driving flow