Q2. Forced convective heat transfer coefficient depends on type of flow (True/False)
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A: Option :( 3 ) is correct Friction factor in turbulent flow depends on the pipe surface roughness
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Q2. Forced convective heat transfer coefficient depends on type of flow (True/False)
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- Q/ ture or false -The flow curves are classified according to the number of reactors and the mechanism of separation or non-separation in the coresA-Given that the volumetric flow rate for a fluid within a circular cross-section tube can be represented by #HAP 8pL Q where r is the tube radius, u is the fluid viscosity, P is the pressure drop across the tube, and L is the tube length, calculate the pressure drop across a tube of length 1 m and diameter of 23 mm. The fluid is blood (μ = 0.0035 N.s/m²) and has a volumetric flow rate of 4.5 L/min. Assuming the same conditions, what would the required pressure drop be for water (u= 0.001 N.s/m²) and chocolate syrup (u = 150 N.s/m²).Subject : Thermofluid Question : Air at 20oC flows in a 0.60 m diameter pipe at a rate of 15 m3/s as shown in Figure 3. The pipe diameter changes to 1.2 m through a sudden expansion. i. Assess the pressure rise across this expansion. ii. Explain how there can be a pressure rise across the expansion when there is an energy loss (KL ≠ 0).
- Oil (specific gravity of 0.80 and a viscosity of 0.000042 lbf-sec/ft²) at a temperature of 80°F flows through two separate pipes 10 and 12 inches in diameter. If the mean velocity of flow in the 12-in pipe is 6 fps, the velocity of flow in the 10-in pipe will be,A. 21 fpsB. 21.5 fpsC. 22.0 fpsD. 22.5 fpsWhen is there a no-slip condition in a flow?a. If the flow is external and the velocity is measured close to the plate/wallb. If the flow is consistent across the pipe's control volume,c. If the flow is laminar and the velocity at the centerline is constant,d. If the maximum velocity approaches the average velocity halfway between the centerline and the wall,3. Dye for our new line of blue jeans is being blended in a mixing tank. The desired color of blue is produced using a concentration of 1500 ppm blue dye, with a minimum acceptable concentration of 1400 ppm. At 9 A.M. today the dye injector plugged, and the dye flow was interrupted for 10 min, until we realized the problem and unclogged the nozzle. For how many minutes was the flow leaving the mixer off-specification (< 1400 ppm)? How many gallons of off-spec dye were made? See Fig. P5-15. Water 20 gal/min 20 gal/min aqueous dye for jeans (1500 ppm blue dye) Concentrated dye injector V= 100 gal FIGURE PS-15 4. A thermocouple junction of area A, mass m, heat capacity C, and emissivity e is located in a furnace that normally is at T C. At these temperatures convective and conductive heat transfer to the junction is negligible compared with radiative heat transfer. Determine the linearized transfer function between the furnace temperature T, and the junction temperature To. For the case m…
- 2.) Hệ thống thể hiện trong hình được sử dụng để đo chính xác sự thay đổi áp suất khi ap suất được tăng lên bằng A P trong đường ống nước. Khi A h=70 mm, sự thay đổi áp suất đường ống là bao nhiêu? Đáp số: AP = 867 Pa Water Pipe Glycerin, SG 1.26 D= 30 mm Ah d=3 mmWater at a temperature of 80°F flows through separate pipes 10 and 12 inches in diameter. Dynamic viscosity of water at 80°F is 861.51uPa.s. If the mean velocity of flow in the 12 in pipe is 6fps, the Reynolds number for the 12 in pipe will beA. 624,000B. 636,000C. 648,000D. 660,000Industrial Pipes What is the function of a trap in a liquid fluid pipe?
- Question B2 - Internal Flow In a large student house in Sheffield, cold water is supplied by the mains water supply at a pressure of 2 bar, gauge, and at a temperature 10°C. A wash basin cold tap is located 3 meters above the mains supply, connected to the mains pipe with a copper pipe of internal diameter 15 mm and length 12 meters. When the tap is opened the flow rate of water out of the tap is 24 litres per minute, creating a Fanning friction factor in the pipe of 0.008. a) Calculate the Reynolds number of the water in the pipe and determine if it is laminar or turbulent. b) Calculate the pressure loss from friction, change in elevation, and hence the pressure of the water just before entering the tap. c) to part b) and state if these assumptions under or over predict the pressure of the water just before entering the tap. Name two assumptions that have been made in order to arrive at your answerQuestion B2 - Internal Flow In a large student house in Sheffield, cold water is supplied by the mains water supply at a pressure of 2 bar, gauge, and at a temperature 10°C. A wash basin cold tap is located 3 meters above the mains supply, connected to the mains pipe with a copper pipe of internal diameter 15 mm and length 12 meters. When the tap is opened the flow rate of water out of the tap is 24 litres per minute, creating a Fanning friction factor in the pipe of 0.008. d) If the value were not given, what procedure would be needed to determine the Fanning friction factor?) where AP is the static The Hagen-Poiseuille equation for the laminar flow through a circular pipe is: AP pressure drop measured over some length of pipe, L. Use the Hagen-Poiseuille equation and the Darcy-Weisbach equation to derive an expression for the fanning friction factor, f, for laminar flow through a circular pipe where Re is the Reynolds number. Choose one answer from the list below: of= of O None of the above 32 Re 16 Re O f = 64 Re = o f = 32μLc 3 d² 8 Re O f = 16 Re