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Download 7TH CLASSES PHYSICS DAILY PLAN
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9TH CLASSES PHYSICS DAILY PLAN SUBJECT: FLUID DYNAMICS GOALS: To learn the relation between the velocity and the pressure of a liquid –Bernoulli’s Principle DURATION: IN PRACTICE: Airplane PRESENTATION: Steady flow: Each particle of the fluid follows a smooth path, and the path of each particle does not cross each other. Nonsteady flow (turbulent): When the flow lines cross each other nonsteady flow occurs. Viscosity: The degree of internal friction within the fluid Now let us look at some general characteristics of fluid flow 1-) Fluid flow can be steady or nonsteady. 2-) Fluid flow can be rotational or irrotational. 3-) Fluid flow can be compressible or incompressible. 4-) Fluid flow can be viscous or nonviscous. We shall deal with steady, irrotational, incompressible and nonviscous fluids A1 and A2? Ex.4 A water hose is used to fill a 20 lt bucket. It fills the bucket in 50 s. If the cross-sectional area of the hose is 40 cm2 a) What is the speed v at which the water leaves the hose? b) If the crosssectional area of the hose is reduced to 20 cm2 what will be velocity v? Ex.5 A water tunnel at a diameter of 3,6 m ends at a diameter of 1,2 m. The velocity V1 =3 m/s. What is the velocity of the water at the other end? BERNOULLI’S EQUATION Bernoulli’s equation says that the sum of the pressure, (P), the kinetic energy per unit volume,1/2 v2, and potential energy per unit volume, gh, has the same value at all points along a streamline. STREAMLINES AND EQUATION OF CONTINUITY Streamline: The path taken by a fluid particle under steady flow. No two streamlines can cross each other. The velocity of the fluid particle is always tangent to the streamline. The amount of water that pass through crosssectional area A1 in a unit time is equal the amount of water that pass through crosssectional area A2. The velocity of a)A1/ A2=? b)P2-P1=? Ex.3 P1-P12=? water through A1 is V1 and through A2 is V2. X1 V1. t M1= .A1 X1 M1= .A1V1 t M2= .A2.V2t M1 = M2 .A1V1 t= .A2.V2t A1V1= A2.V2 This is the equation of continuity. A*V is called volume flux or flow rate and it is constant in all cross-sectional areas in a tube. EX:1 a) V2 =? b) What is flow rate? Ex.2 If the flow rate in the tube shown is 0,02 m3/s. What are V1 and V2? Ex.3 If the flow rate in the tube shown is 24 rn3/s.What are crossectional areas HOMEWORK: MULTIMEDIA: DEMONSTRATION: EXPERIMENT: TEACHER: DIRECTOR: