A hypodermic needle has an inside diameter of 0.3 mm and is 60 mm in length, as shown in Fig. 9-17. If the piston moves to the right at a speed of 18 mm/s and there is no leakage, what force Fis needed on the piston? The medicine in the hypodermic has a viscosity u of 0.980 x 10 Pa s and its density p is 800 kg/m'. Consider flows in both needle and cylinder. Neglect exit losses from the needle as well as losses at the juncture of the needle and cylinder. I For cylinder: Q= Av = [(x)(0.005)/4](0.018) = 3.534 x 10-m'/s Ng = pdu/u = (800)(0.005)(0.018)/(0.980 x 10) = 73 (laminar) 128µLQ nd (128)(0.980 x 10-)(0.050)(3.534 x 10-7) (*)(0.005)* P1= =1.129 Pa For needle: v = Q/A = 3.534 x 10-/((x)(0.3/1000)*/4]= 5.000 m/s Na = (800)(0.3/1000)(5.000)/(0.980 x 10-)= 1224 (laminar) %3D (128)(0.980 x 10)(0.060)(3.534 x 10-"). ()(0.3/1000) P2= = 104 525 Pa F= (Ap)(Aginder) = (104 525 – 1.129)[(7)(0.005) /4] = 2.05 N %3D Cylinder Needle Pi[5 mm VE 18 mm/s = 0.3 mm 50 mm -60 mm

A fluid is flowing in 1 meter diameter pipe with 2 m/s density of fluid =1000 kg/m^3 viscosity of fluid is 2 kg m^-1s^-1 determine flow is laminar of turbulent

1. An incompressible fluid of kinematic viscosity v = μ/p= 10-4 m²/s flows steadily through a circular pipe of diameter d = 10 cm. The pipe flow is fully developed. Friction Factor If the average velocity V is 2 m/s, is the flow laminar or turbulent? What is the value of the friction factor, f? If the pipe is perfectly smooth on its internal surface and V is 20 m/s, the pipe flow is turbulent (double check yourself). Evaluate its friction factor using the Moody chart below. Repeat (c) by numerically solving the Colebrook formula (using, for example, Matlab). Attach the source code you used. Suppose that the pipe internal surface is rough. Also suppose that increasing V up to 200 m/s yields no change in the value of f found in (a). Determine the relative roughness, e/d, using the Colebrook formula. 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.015 0.01 Laminar Flow 64 Material Concrete, coarse Concrete, new smooth Drawn tubing Glass, Plastic Perspex Iron, cast Sewers, old Steel, mortar…

-:Pisometer O two different fluids are used, and it can measure suction pressure and larger pressure than a piezometer it is used to find the difference in pressure between two points it is a type of manometer and it is a tube that is connected to the pipe containing the fluid which is pressure is to be measured