Concept explainers
Determine the velocity of flow and the friction loss as
The velocity of flow
The value of friction loss
Answer to Problem 19.1PP
The velocity of flow, V=570ft/min
The value of friction loss, HL=0.021 in H2O
Explanation of Solution
Given information:
Diameter of the duct, D=18in
Rate of flow, Q=1000 cfm
Length of the duct, L=75 ft
To find out the friction loss, we use the formula
Where,
L= Length of the duct
HL=Friction loss
hL=friction loss of water per 100 ft
friction loss of water per 100 ft is calculated by the chart of friction loss in a duct and it is equal to hL=0.028 in H2O
We compare between any two given values and their intersecting point give the third required value
The velocity of flow is also calculated by the chart of friction loss in a duct and it is equal to
The V=570ft/min
Calculation:
Now we put the known values in equation
HL= 0.021 in H2O
Want to see more full solutions like this?
Chapter 19 Solutions
Applied Fluid Mechanics (7th Edition)
- The air supply to an oil-engine is measured by being taken directly from the atmosphere into a large reservoir through a sharp-edged orifice 50 mm diameter. The pressure difference across the orifice is measured by an alcohol manometer set at a slope of arcsin 0.1 to the horizontal. Calculate the volume flow rate of air if the manometer reading is 271 mm, the relative density of alcohol is 0.80, the coefficient of discharge for the orifice is 0.602 and atmospheric pressure and temperature are respectively 755 mmHg and 15.8 °C. (You may assume R = 287 J · kg¯' ·K!.)arrow_forwardAn air-distribution system for an industrial complex is show in the attached figure, having flow rates as indicated. The velocity in the main duct should not exceed 400 m/min. Using equal pressure drop (Δp/ΔL) in the main duct and balanced pressure drop in the branch line and taking the depth of duct as 2,000 mm throughout, determine the following: A) The height of the main duct B-C dimension in millimeters. B) The height of the branch duct B-E dimension in millimeters.arrow_forwardQ.2) Air flows through a circular duct (D=0.4 m) at a velocity of 4 m/s, determine the pressure drop that occurs over a 6-m length of the duct. The friction factor is f = 0.0005. Take pair= 1.2 kg/m³. 031 400 503arrow_forward
- Using 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 = 1arrow_forwardThe pump is delivering hydraulic oil with a specific gravity of 0.85 at rate of 75L /min to a tank 3.5m above the pump. The pressure at A is -20kpa and the pressure at B is 275 kpa. The head loss in the system is 2.5 times the velocity head in the discharge pipe calculate the power (kW) delivered by the pump for pipe diameter at suction in 52.54mm and discharge pipe diameter is 26.64mmarrow_forwardQ: Select duct sizes for the rectangular duct system shown in the Figure, using the equal friction method. The total pressure available for the duct system is 0.12 in. wg (30 Pa), and the loss in total pressure for each diffuser at the specified flow rate is 0.02 in. wg (5 Pa). Assume the velocity in mean duct 600 fpm. 25 ft (8 m) 150 cfm (0.071 m/s) Plenum Boots are round (2) 5 ft to rectangular. 20 ft (6 m) 15 ft (4.6 m) (1.5 m) (1.5 m) 200 cfm 5 ft 150 cfm 5 ft (0.095 m/s) (0.071 m/s) (1.5 m) 5 ft (1.5 m) E (1.5 m)arrow_forward
- . What horsepower is supplied to air moving at 7m/min through a 70cmx90cm duct under a pressure of8cm of H2O?arrow_forwardRead 14 83% A pipe with a cross sectional area of 5x10 m is delivering oil at a rate of Ix10 m/s at a pressure of 700 kPa. This pipe connects by a gradually expanding pipe to a main of cross sectional area of 3x10 m which runs 2 m above it. Calculate the pressure in the main, neglecting losses to friction. The oil has a density of 890 kg/m. (1) Answer each of the following for an electropneumatic circuit that operates a single acting cylinder with direct control. (i) Sketch the pneumatic and clectrical circuit that uses the logic OR operation to extend the cylinder. (ii) Sketch the pneumatic and cleetrical circuit that uses the logic AND operation to extend the cylinder. (2.5 ks) Air at a pressure of 6 bar gauge pressure has a volume of 3m'. The volume of the air is allowed to increase to 5m' at constant temperature. What is the air gauge pressure at the new volume? The atmospheric pressure is 101.85kN/m. (h) For a vertically mounted hydraulic actuator with an overrunning load, what is…arrow_forwardAn axial fan having a hub diameter of 0.4 m and a hub ratio of 0.5 delivers a flow rate of 5 m3/s at a rotational speed of 1800 rpm. If the chord length at mean radius is 0.12 m, determine the pressure change across the fan using this formulaarrow_forward
- Whole milk flows into the centrifuge through a pipe with a diameter of 7 cm at a speed of 0.22 ms-1, to be separated into cream with a specific gravity of 1.01 and skim milk with a specific gravity of 1.04 Calculate the flow velocity of skim milk and cream in the dispensing pipe with a diameter of 2.5 cm each . The density of whole milk is 1.035. (Do as the example in Earle's book EXAMPLE 3.4) a. Cream flow rate = Answerm / s b. Skim milk flow rate = Answerm / sarrow_forward3. Water at 35 degrees Celsius is flowing through a smooth pipe with a length of 95m and a diameter of 350mm. The Reynolds number for the flow is 275000. Assuming the pipe is completely horizontal and the flow is isothermal, determine the friction head developed in the flow. By how much is the inlet pressure reduced because of the friction?arrow_forwardSelect duct sizes for the rectangular duct system shown in the Figure, using the equal friction method. The total pressure available for the duct system is 0.12 in. wg (30 Pa), and the loss in total pressure for each diffuser at the specified flow rate is 0.02 in. wg (5 Pa). Assume the velocity in mean duct 600 fpm. 150 che 25 Boo ae und torectang a5On e S. 150 ct 0.095 mi 071 15marrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY