Water at 10°C flows in a 1.2-cm-diameter pipe at a rate of 1.33 L/min. The hydrodynamic entry length is (a) 0.60 m (b) 0.94 m (c) 1.08 m (d) 1.20 m (e) 1.33 m
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Water at 10°C flows in a 1.2-cm-diameter pipe at a rate of 1.33 L/min. The hydrodynamic entry length is (a) 0.60 m (b) 0.94 m (c) 1.08 m (d) 1.20 m (e) 1.33 m
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- Water at 10 C flows in a 1.25-cm-diameter pipe at a rate of 1.33 L/min. The hydrodynamic entry length (in meters) isWater at 15C (r = 999.1 kg/m3 and m = 1.138 * 1023 kg/m·s) is flowing steadily in a 30-m-long and 5-cm-diameter horizontal pipe made of stainless steel at a rate of 9 L/s. Determine (a) the pressure drop, (b) the head loss, and (c) the pumping power requirement to overcome this pressure drop.The volume flow rate of laminar and fully developed flow in an inclined pipe of length L can be calculated using the formula of Q=[(ΔP-ρgLsinθ)πD⁴]/128μL. When this pipe is placed on the horizontal plane under the same condition, which term of the above expression should be eliminated?
- Glycerin at 40°C with ?? = 1252 kg/m3 and ?? = 0.27 kg/m·s is flowing through a 6-cm-diameter horizontal smooth pipe with an average velocity of 3.5 m/s. Determine the pressure drop per 10 m of the pipe. What is minor loss in pipe flow? How is the minor loss coefficient KL defined?Consider fully developed flow in a circular pipe with negligible entrance effects. If the length of the pipe is doubled, the head loss will (a) double, (b) more than double, (c) less than double, (d ) reduce by half, or (e) remain constant.is friction factor inversely proportional to the Reynold’s number in case of laminar flow in circular pipes?
- Water at 60°F (? = 62.36 lbm/ft3 and ? = 7.536 × 10−4 lbm/ft·s) is flowing steadily in a 2-in-diameter horizontal pipe made of stainless steel at a rate of 0.2 ft3/s. Determine the pressure drop, the head loss, and the required pumping power input for flow over a 200-ft-long section of the pipe.A light liquid (ρ ≈ 950 kg/m3) flows at an average velocityof 10 m/s through a horizontal smooth tube of diameter5 cm. The fluid pressure is measured at 1-m intervals alongthe pipe, as follows: Estimate (a) the total head loss, in meters; (b) the wallshear stress in the fully developed section of the pipe; and(c) the overall friction factor.A geothermal district heating system involves the transport of geothermal water at 110°C from a geothermal well to a city at about the same elevation for a distance of 12 km at a rate of 1.5 m3/s in 60-cm-diameter stainless-steel pipes. The fluid pressures at the wellhead and the arrival point in the city are to be the same. The minor losses are negligible because of the large length-to-diameter ratio and the relatively small number of components that cause minor losses. (a) Assuming the pump–motor efficiency to be 80 percent, determine the electric power consumption of the system for pumping. Would you recommend the use of a single large pump or several smaller pumps of the same total pumping power scattered along the pipeline? Explain. (b) Determine the daily cost of power consumption of the system if the unit cost of electricity is $0.06/kWh. (c) The temperature of geothermal water is estimated to drop 0.5°C during this long flow. Determine if the frictional heating during flow can…
- A geothermal district heating system involves the transport of geothermal water at 110°C from a geothermal well to a city at about the same elevation for a distance of 12 km at a rate of 1.5 m3/s in 60-cm-diameter stainless-steel pipes. The fluid pressures at the wellhead and the arrival point in the city are to be the same. The minor losses are negligible because of the large length-to-diameter ratio and the relatively small number of components that cause minor losses. (a) Assuming the pump–motor efficiency to be 80 percent, determine the electric power consumption of the system for pumping. Would you recommend the use of a single large pump or several smaller pumps of the same total pumping power scattered along the pipeline? Explain. (b) Determine the daily cost of power consumption of the system if the unit cost of electricity is $0.06/kWh. (c) The temperature of geothermal water is estimated to drop 0.5°C during this long flow. Determine if the frictional heating during flow can…Which has a greater minor loss coefficient during pipe flow: gradual expansion or gradual contraction? Why?Water is transported by gravity through a 10-cmdiameter 550-m-long plastic pipe with an elevation gradient of 0.01 (i.e., an elevation drop of 1 m per 100 m of pipe length). Taking ? = 1000 kg/m3 and ? = 1 × 10−6 m2/s for water, determine the flow rate of water through the pipe. If the pipe were horizontal, what would the power requirements be to maintain the same flow rate?