. In a completely turbulent flow, the head loss a. Increases with velocity b. Increases with velocity squared c. Decreases with wall roughness d. Increases with diameter
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9. In a completely turbulent flow, the head loss
a. Increases with velocity
b. Increases with velocity squared
c. Decreases with wall roughness
d. Increases with diameter
Step by step
Solved in 2 steps with 1 images
- It requires a specific displacement before the flow become fully developed. Entry length a. depends only on diameter of pipe for turbulent flowb. depends on Reynolds number and diameter for turbulent flowc. and diameter ratio varies in turbulent flowd. All of theseWhich of the following is incorrect. a. Friction factor depends on Reynolds numberb. Fanning friction factor can be obtained theoretically in Laminar flowc. Friction factor on laminar flow depends also on surface roughnessd. Moody chart assumes fully developed flowA local ventilation system (a hood and duct system) is used to remove air and contaminants from a pharmaceutical lab (Fig. 1). The inner diameter (ID) of the duct is 129 mm, its average roughness is 0.15 mm, and its total length is L = 24.5 m. There are three elbows along the duct, each with a minor loss coefficient of 0.21. Literature from the hood manufacturer lists the hood entry loss coefficient as 3.3 based on duct velocity. When the damper is fully open, its loss coefficient is 1.8. The minor loss coefficient through the 90° tee is 0.36. Finally, a one-way valve is installed to prevent contaminants from a second hood from flowing “backward” into the room. The minor loss coefficient of the (open) one-way valve is 6.6. The performance data of the fan fit a parabolic curve of the form Havailable = H0 - aV2, where shutoff head H0 = 60.0 mm of water column, coefficient a = 2.50 x 10-7 mm of water column per (Lpm)2 ,available head Havailable is in units of mm of water column, and…
- CORRECT LETTER PLS 1. In laminar flow, which is correct?BJ: higher Re value has higher friction factorJB: lower Re value has higher friction factorGroup of answer choices A. BJ is false and JB is true B. BJ is true and JB is false C. BJ is false and JB is false D. BJ is true and JB is true 2.In turbulent flow, which is correct?BJ: higher Re value has lower friction factorJB: lower Re value has higher friction factorGroup of answer choices A.BJ is true and JB is true B.BJ is false and JB is false C. BJ is false and JB is true D. BJ is true and JB is false 3. In a system with 4 reservoirs and 1 pipe junction, how many continuity equations are formulable?Group of answer choices A. 2 B. 3 C. 5 D. 4 E. 1Using velocity reduction method, design the duct system. Take the velocity of air in main duct as 8m/sec, air density 1.2kg/m. Coranch = 0.4 Coutlet = 1 2. Using equal pressure drop method, design the duct system. Take Ap = 1pa/m, air density 1.2kg \m. Cranch = 0.4 Coutlet = 1Air flows at Q=5 m³/s in a 1-m diameter stainless steel duct (roughness of 0.002 mm) the air properties are (-1.23 kg/m³ and -1.8 x 10^5N-s/m²). Approximate the minimum length of the duct so that entrance lengths can be ignored in the calculation of the pressure drop. a.41.1 m b.206 m c.20.6 m d.0411 Option a is incorrect
- 13. For the same value of Reynolds number friction factor for steady laminar for circular pipe is greater than that for the flow between parallel plates. (T/F) 14. Pipe roughness is important for turbulent flow only. (T/F) 15. A 1 cmx 20 cm sheet of water is deflected as shown in Figure. The magnitude of the horizontal force acting on the stationary deflector is nearest....... a) 6830 N b) 5000 N d)2500 N e) none of theseB1. A crude oil of specific gravity 0.85 is flowing through a pipe of diameter 325 mm and the frictional head loss of 5 m of crude oil between the two ends of a pipe which are 675 m apart. Calculate the Reynold's Number, discharge of crude oil in the pipe. Take co - efficient of friction as 0.0085 and kinematic viscosity as 10 stokes. (Enter only the values by referring the unit given. Also upload the hand written answers in the link provided) The velocity of flow of oil in the pipe is (m/s) The Reynold's Number for the flow is Discharge of crude oil through pipe (in m3/s) isIn a pipe of diameter 300mm the center line velocity and the velocity at a point 100mm from the center, as measured by pitot tube are 2.4 m/s and 2.0 m/s respectively. Assume the flow in the pipe to be turbulent find: 1-Dischrge through the pipe,2-Coefficient of friction, 3 Height of roughness projections.Please do not waste my question solve with correct answers only.
- 1. A research experiment requires a laminar flow of water at 20°C through a 120mm diameterpipe at a Reynolds number of 1992.A. What is the average velocity?B. What maximum velocity is to be expected?C. What would be the pressure drop over a 11m horizontal length of developed flow? Useρ= 1000 kg/m3and v=1x10-6m2/s.D. How long would the entrance region be?Attempt Once Please. Answer all parts please (d) What is the hydraulic diameter of a triangular duct with sides (of its cross-section) of 2-cm, 3-cm, and 4-cm? 2 cm (e) An internal flow is considered laminar if its Reynolds number is less than 2300. You have to transport air at 30°C at 0.1 kg/s. What should the minimum diameter of the transporting tube be so that the flow is laminar? 4 cmfluid flow sulphuric acid with 75% concentation of density 1650 kg/m³ and viscosity 8.6 m N/m². is to be pumped for 0.8 km along a 50mm internal dimeter pipe at the rate of 3 kg/s and the faised vertically 15m by the рит р driven and has If the pump is electrically efficiency an What the power will be required? take (E) as 0.046 m us of 50% what