Flow Characteristics (Entrance Effect) -Why is the Δ P/ L Line extrapolated to the tube entrance for the calculation of the entrance loss coefficient, KL
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Flow Characteristics (Entrance Effect)
-Why is the Δ P/ L Line extrapolated to the tube entrance for the calculation of the entrance loss coefficient, KL ?
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- XTTTTT 77 shown Farabolic velocity distribution u.(r) U max T r=0 Linear momentum flux distribution T(r) (,-,)R 2L r2, maxlong. 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 isAs an engineer, you are setting up an experiment to measure the airflow rate in a duct. Choose a technique and devices for the measurement. You are required to design/draw the set-up and demonstrate the calculation for themeasurement of flow rate. Please discuss the relevant principle involved and reason for selectingthe technique.
- Find the Fanning friction factor (f) for a 60% sucrose solution at 70oF flowing inside a 0.05-m diameter pipe, roughness of 10x10-5, average velocity of 15 m/s (density = 1,400 kg/m3, viscosity = 60.2 cP).Consider a pipe on a horizontal plane: based on Bernoulli's equation A. none of the above B. the inlet velocity will be less than the outlet velocity C. the inlet velocity will be greater than the outlet velocity D. the elevation of the inlet will be greater than that of the outletH.W. (a) Derive an expression for the volumetric flow rate of a fluid flowing through an orificemeter. Write down the advantages and disadvantages of using orificemeter over a venturimeter. (b) Water is flowing through a pipeline of 50 cm ID at 30°C. An orifice is placed in the pipeline to measure the flow rate. Orifice diameter is 20 cm. If the manometer reads 30 cm of Hg, calculate the water flow rate and velocity of the fluid through the pipe. pwater at 30°C = 987 kg/m³. p = 13600 kg/m. Orifice co-efficient. = 0.6 3/5/2024 61 OPE
- watu enters a tube (d=6omm) ta rate of oiol ka/s with temp. of 2öc . A constant het flux of 2000 wii was applied. What rs the tube length requined to obtain an exit temp. of 8c.what is the surface temp.at the outlet of the tube, where fully daveloped conditions maybe assumed to exist -PUMP SYSTEM – SYSTEM CURVE AND NPSH The pumping system shown below consists of a suction pipe of length 3m and diameter 80mm; delivery pipe of length 6m and diameter 80mm; 4 elbows, each with a loss coefficient of k = 0.3; total static lift = 6m; tank entry and exit loss coefficients 0.5 and 1.0, respectively; suction and delivery pipe friction factor f = 0.007Darcy. A Robuschi 150-500 pump rotates at 1470 rpm and the desired flow rate is a minimum of 200 m3/h. SUCTION PIPE Complete the following tasks: 1. Draw the system curve as described above on the Roubuschi pump curve data sheet supplied. Work in increments of Q 50m3/h starting at 0 (7-point curve) 2. Would you advise the client to select the p400 or ¢460 impeller? Give two reasons for your answer. If the 400 impeller is used: Assume: the gauge pressure in the suction tank at 115 kPa, the vapour pressure of the water at its average operating temperature at 20C suction height as 1.5 m. 3. Is the pump likely to cavitate? Support…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. 150 che 25 Boo ae und torectang a5On e S. 150 ct 0.095 mi 071 15m
- watu enters a tube (d=6omm) ta rate of o.ol Kals with temp. of 2öc . A constant het flux of 2000 winh was applied. What rs the tube length requined to obtain an exit temp. of såc. what is the surface temp.t the outlet of the tube, where fully developed conditions maybe assumed to exist. -A kitchen chimney, made of HINDWARE with exhaust pipe dia. of 90 cm supplies exhaust gas having flow rate of 1200 80 m3/hour. Length of exhaust pipe is 5m. Now BAJAJ Company wants to design a chimney to crater same flow rate but rectangular type with aspect ratio of 1.5. The length of exhaust pipes for both cases is assumed to be 5m. Also consider same friction factor for both the pipes as 0.182.Determine (i) the pressure drop for the HINDWARE duct. (ii) Considering the same pressure drop for the BAJAJ duct, determine its sides.3. Vertical turbines are to be used for flocculation in a water treatment plant with a design flow rate of 189,270 m³/day. Flocculation is to be designed with two trains and five compartments per train. The total detention time in this process is to be 25 minutes, and the average temperature of the water flowing into the plant is 10°C. The velocity gradient in the first compartment is to be 70 s¹. Make the following design decisions for the first compartment: a) Determine the dimensions of the compartment. b) Determine the diameter of the impeller. c) Determine the water power required. d) Determine the maximum rotational speed. e) Estimate the pumping capacity of the impeller and circulation time in the tank.