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- 4. An experimental test rig is used to examine two-phase flow regimes in horizontal pipelines. A particular experiment involved uses air and water at a temperature of 25°C, which flow through a horizontal glass tube with an internal diameter of 25.4 mm and a length of 40 m. Water is admitted at a controlled rate of 0.026 kgs-¹ at one end and air at a rate of 5 x 104 kgs¹ in the same direction. The density of water is 1000 kgm3, and the density of air is 1.2 kgm-³. Determine the mass flow rate, the mean density, gas void fraction, and the superficial velocities of the air and water. Answer: 0.02605 kgs-1, 61.1 kgm ³, 0.94, 0.822 ms-1, 0.051 ms-14. An experimental test rig is used to examine two-phase flow regimes in horizontal pipelines. A particular experiment involved uses air and water at a temperature of 25°C, which flow through a horizontal glass tube with an internal diameter of 25.4 mm and a length of 40 m. Water is admitted at a controlled rate of 0.026 kgs¹ at one end and air at a rate of 5 x 104 kgs-¹ in the same direction. The density of water is 1000 kgm 3, and the density of air is 1.2 kgm 3. Determine the mass flow rate, the mean density, gas void fraction, and the superficial velocities of the air and water. Answer: 0.02605 kgs-¹, 61.1 kgm-³, 0.94, 0.822 ms-¹, 0.051 ms-¹3. 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.
- 3. A natural gas is flowing through a long distance smooth pipeline (1 m in diameter) at a constant temperature. The gas enters the pipeline at a velocity of 12 m s-1 and at the temperature and pressure of 20 °C and 690 kPa, respectively. Compressors and coolers are provided every 15 km along the pipeline to recompress and cool the gas to its initial temperature and pressure. Calculate the theoretical power requirement to compress the gas by each compressor. Assume that the compression is an adiabatic frictionless process and the work done by the compressor on unit mass of gas is given by: AW = Pout vdP [J kg-¹] Pin where Pin and Pout are the pressures at the inlet and outlet of the compressor, respectively, and vis the specific volume of gas. Hint: see Coulson and Richardson, Volume 1, Section 8.3.4, page 347-351. Specific heat ratio y (= C₂/C₂) = 1.3 [Ans. 845631 W]Q2. Forced convective heat transfer coefficient depends on type of flow (True/False)answer=correct
- A petroleum crude oil having a density of 892 kg/m3 is flowing through the piping arrangement shown at a total rate of 1.388 x 10-3 m3/s entering pipe 1. The flow divides equally in each of pipes 3. The steel pipes are schedule 40 pipe. Calculate the following SI units.(a) The total mass flow rate in pipes 1 and 3. Ans. 1.238 kg/s, 0.619 kg/s(b) The average velocity in 1, 2 and 3. Ans. 0.641 m/s (pipe 1), 0.528 m/s (pipe 3)(c) The mass velocity G in 1. Ans. 572 kg/m-s2Pipe 1: 2-in pipe, D1 = 2.067 in Pipe 2: 3-in pipe, D2 = 3.068 in Pipe 3: 1 ½ - in pipe, D3=1.610 inI need both the parts otherwise skip I have 4 ids so I'll rate you positivelyOil having a density of 833 kg/m3 and a viscosity of 3.3 x 10-3Pa.s is pumped from and open tank to a pressurized tank held at 345 kPa gage. The oil is pumped from an inlet the side of the open tank through a line of commercial steel pipe having an inside diameter of 0.07792 m at the rate of 3.494 x 10-3 m3/s. The length of the straight pipe is 122 m, and the pipe contains two elbows (90°) and a globe valve half open. The level of the liquid in the open tank is 20 m above the liquid level in the pressurized tank. The pump efficiency is 65% Calculate the kW power of the pump.
- The air in a 6 m x 5 m x 4 m hospital room is to be completely replaced by conditioned air every 20 min. If the average air velocity in the circular air duct leading to the room is no to exceed 5 m/s, determine the minimum diameter of the duct. a.0.16 m-diameter b.0.64 m-diameter c.0.32 m-diameter d.0.08 m-diameterFor an inlet valve, the mass flow rate through the valve is 0.44 kg/s. The flow coefficient is 0.62 and the cylinder pressure is 105 kPa. Assume intake system pressure and temperature are 180 kPa and 527 K, the specific heat ratio is 1.3 and R =287 J / kg.K. The area of the valve is (SI unit): Select one: a. 2.30*10-3 O b. 3.45*10-2 O c. 1.43*10-3 O d. 1.75*10-3 O e. 0.85*10-2Determine the velocity of steam flowing in a circular pipe with a diameter of 4” and a volume flow rate of 4L/s