In an Osborne Reynolds Demonstration experiment, why is it the in laminar flow, the color collected has a color unlike in transitional and turbulent flow where the color of liquid is just transparent?
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In an Osborne Reynolds Demonstration experiment, why is it the in laminar flow, the color collected has a color unlike in transitional and turbulent flow where the color of liquid is just transparent?
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- What is mechanical pressure Pm, and how is it used in an incompressible flow solution?Consider a thin-walled, fi xed-volume container of volume V that holds an ideal gas at constant temperature T. It can be shown by dimensional analysis that the number of particles striking the walls of the container per unit area per unit time is given by nv-/4, where as usual n is the particle number density. The container has a small hole of area A in its surface through which the gas can leak slowly. Assume that A is much less than the surface area of the container. (a) Assuming that the pressure inside the container is much greater than the outside pressure (so that no gas will leak from the outside back in), estimate the time it will take for the pressure inside to drop to half the initial value. Your answer should contain A, V, and the mean molecular speed v-. (b) Obtain a numerical result for a spherical container with a diameter of 40 cm containing air at 293 K, if there is a circular hole of diameter 1.0 mm in the surface.Download Image Download PDF Question: In the context of applied fluid mechanics, explain the difference between laminar and turbulent flow. At what Reynolds number is the transition typically observed in a circular pipe? (Note: The answer to the second part of the question is typically around Re-2300 However, the exact transition point can vary depending on various factors)
- Consider steady state, laminar flow of a fluid in the -y direction between two parallel and vertical plates with a distance of h. Plate A is stationary. Plate B moves in –y direction, as shown below. Derive an equation for the velocity profile.Which are not true about Capillarity? (a) Capillary rise increases as the surface tension increases (b) A small bore tube will produce a higher capillary rise (c) Temperature will not affect the capillary rise of a liquid (d) In wetting fluids inside a tube, adhesion is less than cohesion, (e) If the wetting angle is greater than 90 degrees, the fluid inside a tube will fall (f) Dense fluids will rise less inside a thin bore tube, (g) The specific gravity of a fluid does not affect the capillary riseA velocity of the cylindrical particles of diameter and length are 0.3 mm. It is drop in the air tube .The density of the particle is 1200 kg/m³. The initial velocity of the particle is zero. Air conditions are 28 °C and 1 atm. The viscosity of air is 1.8 x 105 kg/m-s, and superficial velocity of air is 11 m/s. The Reynolds number range is between 1100 and 900. (a) Derive an equation of the velocity of the particles with neglect wall effects. (b) How long of distance if the velocity become steady state filling?
- Cooling water for a power plant is stored in a pond 900 m in length and 400 m wide. A dry wind at 300 K blows in a horizontal direction parallel to the 900 m side of the pond at a velocity of 2 m/s. The cooling water is at 300 K. Known the air dynamic viscosity v= 1.67 x10m?/s.; the Re transition from laminar flow to turbulent flow is 500,000; and the saturated water vapor pressure at 300 K is 3580 Pa; gas constant R= 8.3144 J/mole.K. 1.) At what position across the pond is the air flow no longer laminar? Would it reasonable to assume that the mean gas-film mass transfer coefficient for water vapor in air is dominated by turbulent flow mass transfer? 2.) As part of an engineering analysis to predict the evaporation rate of water from the pond, determine the mean gas film mass transfer co-efficient. 3.) Calculate the rate of water evaporation from the pond.As a process engineer, you are designing a new drinking water treatment plant using conventional treatment process including Two Trains of Flocculators as follows: The design flow is 0.35 m³/s. The average temperature of water is 5°C with a dynamic viscosity, μ = 1.519 x 10-3 Pa.S and p = 999.967 kg/m³. The major target of the WTP is to remove color from water using alum as coagulant. GAvg 0 = 120,000. In each train of flocculators, it includes three same size compartments in series with the tappered velocity gradients G: 80, 50, and 20 Sec-¹. Length = Width = Depth for each Comparment. The type of impeller is axial-flow with three blades. The available impeller diameters are 1.0, 1.8 and 2.7 m. The water depth below the impeller, B = 1/3 H. H is the water depth in flocculator.Carbon dioxide at 300 K flows across one side of a flat plate at a velocity of 18 m/s. The plate measures 2.30 m in the direction of flow and 1.0 m wide. If the surface temperature is 400 K, find the convective heat transfer
- Example(1-14): mixture gas and liquid flow through 0.02 m inside diameter pipe at total flow rate of 0.2 kg/s. if the gas weight fraction is 0.149 what is the pressure drop per unit length of pipe. Where the pipe roughness 0.00015 mm, liquid and gas viscosities are 2x103 pa.s and 1x10-5 pa.s respectively. finaly the liquid and gas densities are 1000 kg/m³ and 60 kg/m³ pa.s respectively.Example 6. For free flow of air over a plate, it is given that Grashof number is 7 x 10° and Prandtl number is 0.25. Then, determine the type of flow.Topic: Heat transfer Completely solve and box the final answer. 1. A 20degC water flows to 50cmx60cm flat plate with velocity of 5.2m/s . The flat plate surface temperature is maintained at 40deg C. The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent?