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For a sharp-edged inlet and a combined entry region, the average Nusselt number may be computed from Equation 8.63, with
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- Solve and draw also the figures. i. Water is flowing through a pipe of 100 mm diameter under a pressure of 19.62 N/cm² (gauge) and with mean velocity of 3.0 m/s. Find the total head of the water at a cross-section, which is 8 m above the datum [Ans. 28.458 m] ii. A pipe, through which water is flowing is having diameters 40 cm and 20 cm at the cross-sections 1 and 2 respectively. The velocity of water at section 1 is given 5.0 m/s. Find the velocity head at the sections 1 [Ans. 1.274 m ; 20.387 m ; 0.628 m³/s] line. and 2 and also rate of discharge. The water is flowing through a pipe having diameters 20 cm and 15 cm at sections 1 and 2 respectively. iii. The rate of flow through pipe is 40 litres/s. The section 1 is 6 m above datum line and section 2 is 3 m above the datum. If the pressure at section 1 is 29.43 N/em², find the intensity of pressure at section 2. [Ans. 32.19 N/cm²]arrow_forwardMy Questions | Answered: MEC x A simply suppor C Search Textbool /ethuto.cut.ac.za/ultra/courses/_9063_1/cl/outline • Question Completion Status: The temperture radius The vo throu and 62 of a pipe with inner and outer radius r, are given by 12 In() 2 nkL and 82 Incr2 %3D 2 пkL i=1(e where Q is the heat transfer rate, L is the length Where the er tempe Evalua of the pipe and k is thermal conductivity. Making Q the subject of the formula gives A In(r)-In(r2) 2nkL (6,-02) n=2, в 2пkL (0,— в) In (r-r2) 2 nk L(8-82) gives 61. C Incr)-Incr2) B 1.6 C 0.6 D None of the above is correct D No O A Option A is correct OB. Option R is correctarrow_forwardA pitot-static probe is used to determine the flow velocity by measuring the differential pressure as shown in Figure 7. The pressure difference sensor used in the system is electronic types and the output of the device is measured in voltage. The output of the pressure device is 3.5 V and the linear relationship between the device and the pressure difference is 10 kPa/v. i. Derive pitot formula to obtain flow velocity from Bernoulli equation, ii. Calculate the pressure difference inside the system, iii. Determine the velocity inside the system if the the fluid is water, and iv. Explain the cause that / ontirbute to inaccurary in the velocity reading. Fluid Flow, V Stagnation Static pressure pressure Pi-P2 Figure 7: Pitot static probearrow_forward
- 04: For the piping system, compute pressure at A, and mid pipe 2. If pipe (3) & pipe (4) havi equal discharge, and pipe (1) have the same properties of pipe (5). Neglect minor losses. (S F S) Pipe 1 L (m) Pipe 2 460 Pipe 3 300 Pipe 4 365 D (cm) Q (1/sec) 245 30 30 20 38 566 f PB (kPa) Pipe 1 0.027 500 Pipe 2 Pipe 3 rig 4. B Pipe 4 Pipe Sarrow_forwardGiven: diameter of pipe in point 1 = 3.9indiameter of pipe in point 2 = 2.5inspecific gravity of the liquid = 0.79h(ft) = 0.60ftpressure at point 1 = 14.6 psiapressure at point 2 = 49 psiapump and motor efficiency = 66%diameter of pipe in point 4 = 4.5indiameter of pipe in point 5 = 2.3 inZ3 = 35ft With the schematic diagram of a pump, tanks, and piping determine the following:1) The velocity of the liquid at point 2 (ft/s)2) Pump work used by the liquid (Wpump U) (hp)3) Electric motor power in out (kW)4) In figure 3, the shaded (pink) in the U tube is mercury; determine y. specific gravity of mercury 13.75) Mass flow ratearrow_forwardThe air is measured at 48 deg. C and 647mm Hg. The duct diameter is 545 mm while the discharge diameter is 248mm The fan draws 4 m^3/s air and the static pressure measured is 2 cm water Determine the total head in terms of water. Answer in meters and should be round off to 2 decimal placesarrow_forward
- Q4/A- The mass of the filter is 25.3046 gm. after 20 min the filter mass will be 25.4112 gm. with volumetric flow is 5.2 m 3/hr. What is the concentration of pollutant after one dayarrow_forwardQ3) The path of a projectile is shown in figure (3). If the object has an initial velocity of Vo-30 m/s that is perpendicular to the slope, determine d? wwwwwamangu Vo=30m/sarrow_forwardA fluid is being pumped through a pipe. The density of fluid is 872 kg/m³. The viscosity is 2.8x102 Pa.s. The velocity in the pipe is 5.9 m/s. If the Reynolds number is 2100. a- What is the pipe cross-sectional area? b- If the pipe cross-sectional area increased 1.5 fold under same Reynold number, density and viscosity, what is the new velocity?arrow_forward
- 4. Piping system as shown in the figure. Determine the amount of force required to pump 100 L/s of fluid (S=0.85,n=10-5 m^2/s).The pump operates with efficiency.Related n = 0,75. 'data given in the picture. Line 1: L=10 M,D=0.20 M,e=0.05mm ,K1=0.5 ,Kv =2 Line 2: L=500 M,D=0.25m ,e=0.05 mm , Ke=0,25 ,K2=1 el 20 m K, Line 2 el 10 m Line 1 K.,arrow_forwardUse g=32.2 */sec2 (9.81 m/s2) and 60°F (16°C) water unless told to do otherwise.• Google schedule-40 pipe’s thickness at different nominal size to obtain the innerdiameter of the pipe for accurate determinaLon of flow velocity.• Must show your work to support your selecLon. Otherwise, no points will be given.Water flows through a schedule-40 pipe that changes gradually in diameter from 6 in (154mm) at point A to 18 in (429 mm) at point B. The volumetric flow rate is 5.0 *3/sec (130 L/s). The respecLve pressures at points A and B are 10 psia (70 kPa) and 7 psia (48.3 kPa). All lossesare insignificant. What are the direcLon of flow and velocity at point A? (A) 3.2 */sec (1 m/s); from A to B(B) 25 */sec (7.0 m/s); from A to B(C) 3.2 */sec (1 m/s); from B to A(D) 25 */sec (7.5 m/s); from A to Barrow_forwardlong. The inlet water temperature is 10 C, and the tube wall temperature is 15 C water temperature. k 0.585, Pr= 9.4, u= 1.31x10*,p= 992kg/m, CP= 4195 j/kg. higher than the water temperature all along the length of the tube. What is the exit %3D Q5//answer one of the following branches e jall al je yal A) cast iron pipe (k=75w/m. °C) air flows inside this pipe at 300°C the inner diameter is 0.06 m, the outer diameter 7cm,it is covered with insulation type glass wool with thick 4cm. with k= 0.055w/m.°C .the ambient temperature 6 °C by free V3. convection with heat transfer coefficient (20w/m2. °C) the heat transfer inside the pipe is 65 w/m?. °C. length of tube (L-2) determine 1-the heat lost from the hot air 2-the temperature drop across the pipe shell 3-the temperature drop across the insulation. 344 14. 1256 and B) Fill the blanks: of the 1. The thermal resistance of a medium depends on medium. 2 All law. pes of convection are governed by 10000, the flow isarrow_forward
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