Why does the rod of a double-acting cylinder retract at a greater velocity than it extends for the same input flow rate?
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Why does the rod of a double-acting cylinder retract at a greater velocity than it extends for the same input flow rate?
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- 11. Air is flowing through a 23.69-cm diameter pipe with a velocity of 6.83 m/s. If the temperature of the air is 24.66°C and pressure is 122 kPa, compute the flow rate of air in the pipe in kg/s.Pressure Drop of Power-Law Fluid in Laminar FlowA power-law fluid having a density of 1041 kg/m3 is flowing through 14.9 m of a tubing with an inside diameter of 0.0524 m at an average velocity of 0.0728 m/s. The rheological or flow properties of the fluid are K′ = 15.23N·sn′/m2 (0.318 lbf·sn′/ft2) and n′ = 0.40. Calculate the pressure drop and friction loss using Eq. (9.1-10) for laminar flow. Check the generalized Reynolds number to make sure that the flow is laminar. Repeat part (a) but use the friction-factor methodFor these velocity distributions in a round pipe, indicate whether the kinetic-energy correction factor ∝ is greater than, equal to, or less than unity.
- 1-) Air at a temperature of 10 °C flows with a volume flow of 50 L/sec in a horizontal pipe with a diameter of 12 cm and a length of 5 m with ε=2.10-5 m roughness and an inner surface temperature of 50 °C. Assuming that the flow is fully developed, calculate a) the average temperature of the air at the outlet plane, b) the amount of heat transfer. 2-) Calculate the rate at which the average friction coefficient, friction force and heat transfer rate will change if the free flow rate of the turbulent air flowing parallel to the plate over a smooth plate is doubled. Does the result change for constant temperature and constant heat flux conditions; Please evaluate. 3-) A person produces an average of 70 W of heat and loses a quarter of this heat from the head area by natural convection and radiation. Calculate the amount of heat transfer that takes place by a) natural convection and b) radiation in a room at 20 °C, considering the human head as a sphere with a diameter of 25 cm at 35 °C.Sketch the velocity gradients that arise from pressure-driven flow for a Newtonian liquid and a shear thinning liquid.Consider a pipe on a horizontal plane: based on Bernoulli's equation A. none of the above B. the inlet velocity will be less than the outlet velocity C. the inlet velocity will be greater than the outlet velocity D. the elevation of the inlet will be greater than that of the outlet
- Write the assumptions in flow through circular tube?. Two identical tanks of large area contain different fluids. Both of them has ahole of the same height from the top, but the cross sectional area of the first tankis half of that of the second tank.a. What is the ratio of the densities of the two fluids if the mass flow ratethrough the holes is equalb. What is the ratio of the volume flow rate through the holes of the tanksc. For an equal volume flow rate from the two holes, what should be theratio of the depth of the holes.Consider laminar flow through a very long straight section of round pipe, that the velocity profile through a cross-sectional area of the pipe is parabolic with the axial velocity component given by V = 2Vavg(1 − r2/R2) where R is the radius of the inner wall of the pipe and Vavg is the average velocity. Calculate the momentum-flux correction factor through a cross section of the pipe for the case in which the pipe flow rep resents an outlet of the control volume
- A drainage hole (assumed to be a smooth edged orifice) is opened at the bottom of a storage tank full of water. Using Bernoulli’s equation as a starting point, derive an expression that relates the height of water in the storage tank to the volumetric flow rate of water emerging from the orifice.During a retrofitting project of a fluid flow system to reduce the pumping power, it is proposed to install vanes into the miter elbows or to replace the sharp turns in 90° miter elbows by smooth curved bends. Which approach will result in a greater reduction in pumping power requirements?// A 180 cm-diameter tank is 4 points initially filled with water 220 cm above the center of a sharp edged 15 cm diameter orifice. The tank water surface is open to the atmosphere, and the orifice drains to the atmosphere. Neglecting the effect of the kinetic energy correction factor, calculate (a) the initial velocity from the tank and (b) the time required to empty the tank. Does the loss coefficient of the orifice cause a significant increase in the draining time of the tank?