Engineering

Engineering, 18.07.2019 17:30, emarquez05

In a river there is a very smooth, low-speed flow of water. this flow can be considered to be: a)- turbulent b)-free convection c)- natural convection d)-sonic laminar

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Physics, 30.06.2019 01:40, Grayvtrain555

Afarmer is to pump water at 70°f from a river to a water storage tank nearby using a 125-ft-long, 5-in-diameter plastic pipe with three flanged 90° smooth bends. the water velocity near the river surface is 6 ft/s, and the pipe inlet is placed in the river normal to the flow direction of water to take advantage of the dynamic pressure. the elevation difference between the river and the free surface of the tank is 12 ft. for a flow rate of 1.5 ft3/s and an overall pump efficiency of 75 percent, determine the required electric power input to the pump. the density and dynamic viscosity of water at 70°f are ρ = 62.30 lbm/ft3 and μ = 2.360 lbm/ft·h = 6.556 × 10–4 lbm/ft·s. the roughness of a galvanized iron pipe is ε = 0.0005 ft.

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Chemistry, 19.07.2019 01:10, 82coogs

Under standard conditions, ar nows with an average velocity of v = 50 m/s through a 4.0-mm- diameter drawn tubing. in these conditions, the flow is categorically turbulent. however, under certain precautions (.e., the entrance to the tube is very smooth, the air is dust free, and the tube does not vibrate), it is possibly to maintain laminar flow in order to avoid disturbances. calculate the pressure drop (ap) in a 0.1-m length section of the tube if the flow is: 1) laminar [15 marks] ii) turbulent [15 marks] par = 1.23 kg/m2 har 1.79 x 10n-s/m2

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Physics, 10.09.2019 17:30, adityamahesh2002

Acommon parameter that can be used to predict turbulence in fluid flow is called the reynolds number. the reynolds number for fluid flow in a pipe is a dimensionless quantity defined as re = rhovd μ where rho is the density of the fluid, v is its speed, d is the inner diameter of the pipe, and μ is the viscosity of the fluid. viscosity is a measure of the internal resistance of a liquid to flow and has units of pa · s. the criteria for the type of flow are as follows. • if re < 2,300, the flow is laminar. • if 2,300 < re < 4,000, the flow is in a transition region between laminar and turbulent. • if re > 4,000, the flow is turbulent. (a) let's model blood of density 1.06 103 kg/m3 and viscosity 3.00 10-3 pa · s as a pure liquid, that is, ignore the fact that it contains red blood cells. suppose it is flowing in a large artery of radius 1.25 cm with a speed of 0.0650 m/s. show that the flow is laminar. (state the reynolds number of the flow, which will be less than 2,300, indicating laminar flow.) (b) imagine that the artery ends in a single capillary so that the radius of the artery reduces to a much smaller value. what is the radius of the capillary that would cause the flow to become turbulent? (use the minimum reynolds number for which flow is fully turbulent.)

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Engineering, 31.10.2019 00:31, edwmal638

When fluid flows through a pipe, the reynolds number will output whether the flow is laminar (smooth, re < 2100), transitional, or turbulent (re > 4000). the reynolds number is expressed as re = rhov d µ where rho is the density, v is the flow velocity and d is the pipe diameter, and µ is the fluid (dynamic) viscosity with units [µ] = kg/(m · s). (a) verify that the reynolds number is dimensionless using si units. (b) if water at room temperature (20oc) flows through a pipe with a diameter of 10 cm at a speed 1 cm/s, is the flow laminar, transitioning, or turbulent? you should use rho = 998.2 kg/m3 and µ = 1.002 × 10−3 kg/(m · s). show your work. (c) the flow in part (3b) is maintained by a pump which produces a constant volumetric flow rate q = v · a = 7.854 × 10−5 m3/s, where a = πd2/4 is the pipe’s cross-section area. derive a reynolds number involving q rather than v . (d) if the flow in parts (3b) and (3c) suddenly transitions from a 10 cm diameter pipe to one with diameter 2 cm. what behavior do you expect in the narrower pipe?

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