Consider a heat exchanger made of sheets of parallel flat plates. Water at 25 C, 1 atm, and 4 m/s flows over a plate. Find the water flow rate in the boundary layer of one plate at 10 cm from the leading edge.
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19. Consider a heat exchanger made of sheets of parallel flat plates. Water at 25
C, 1 atm, and 4 m/s flows over a plate. Find the water flow rate in the boundary
layer of one plate at 10 cm from the leading edge.
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- Water at an average temperature of 23 deg C flows through a 10-cm diameter pipe that is 2.5 m long. The pipe wall is heated by steam and is held at 100 deg C. The convective heat transfer coefficient is 2.25 x 10^4 W/m^2K. Find the heat flow in W.A fluid enters with a steady flow of 3.7 kg/s and an initial pressure of 690 kPa, an initial density of 3,2 kg/m", an initial velocity of 60 m/s, and an initial internal energy of 2000 kJ /kg. It leaves at 172 kPa, p = 0.64 kg/m, v = 160 m/s, and u = 1950 kJ/kg. The heat loss is found to be 18.6 kJ /kg. Find the work. NOTE: Show correct sign convention.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 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-¹
- Air enters a duct (100 cm *10 cm*10 cm) at 32°C at a rate of 0.28 m/min to cool 138 W electronic component placed on the duct. Assuming 85 percent of the heat generated inside is transferred to air flowing through the duct and the remaining 15 percent is lost through the outer surfaces of the duct. What is the convective heat transfer coefficient (W/m2.°C), Assume fully developed flow for the whole channel length and (if flow is NOT Laminar use Dittus-Boelter equation:Nu=0.023 Re0.8Pr") E1007 J/kg.°C, v =1,654×10 m /s, p = 1.146 kg/m Pr= 0.7268, k = 0.02625 W/m. °C Select one:The fluid condition at the inlet and exit of a horizontal convergent nozzle is analysed. The nozzle is operating steadily. and heat loss is assumed negligible. If the specific enthalpy of fluid and velocity, of fluid at the inlet are 3,212 kJ/kg and 237 km/hr respectively. At the exit the specific enthalpy of fluid is 2,556 J/kg. Calculate the rate of flow of fluid (mass flow rate) when the inlet area is 0.22 m2 and the specific volume at the inlet is 0.32 m3/kg.A saturated steam at 410K is being transported in a pipeline (brass drawing tubing) at a rate of 1 grams/second. Pipe has inside diameter of 0.025 m . The tube is 100m long. The pressure at the entrance is 80kPa. (use Perry's Handbook for the properties and constants) R = 8314J/kg mol K; MW=18.02g/mol a. What is the value of G in kg/s.m2? b. What is the value of friction factor? c. What is the % of pressure drop? d. Calculate the outlet pressure.
- Q=2000J Vout =? m (kg/s) D=0.1m air Air at (4.65x10^2) K flows out of a circular pipe at 101325 Pa as shown in Figure. The mass flowrate of the air at the pipe entrance is 0.0093 kg/s. The diameter of the pipe is 0.1m. Specific gas constant of air is 287 J/kg-K. Specific heat of air is 1000 J/kg-K. Find the outlet Velocity if 2000 J of heat is added to the pipe. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer4. 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-1Q=2000J Vout =? m (kg/s) D=0.1m air Air at (5.15x10^2) K flows out of a circular pipe at 101325 Pa as shown in Figure. The mass flowrate of the air at the pipe entrance is 0.0093 kg/s. The diameter of the pipe is 0.1m. Specific gas constant of air is 287 J/kg-K. Specific heat of air is 1000 J/kg-K. Find the outlet Velocity if 2000 J of heat is added to the pipe. Answer should be in m/s with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer DELL
- A fluid flows into a nozzle at T = 673.15 K and P = 0.80 MPa (H = 3267.7 kJ/kg, V =0.38429 m3/kg) with a u = 10 m/s. It exits at T = 573 K and P = 0.20 MPa (H = 3072.1 kJ/kg, V =1.31623 m3/kg). Heat at the amount of 25 kW is lost in the process. If the inlet has an area of 0.08 m2, what is the velocity u at the exit (in m/s)? a.606 b.625 c.644 d.55630°C, 10m/s 2m Electronic components inside D= 20cm Figure 5 You are designing components of an electronic systems that needs to be inside a 2 m long horizontal duct. The components are sensitive so the cooling mechanism is only done by air flowing over the duct at 30°C and 10 m/s. Initially you proposed a square cross-section with 20-cm length for the duct but is rejected by your client because they said a circular cross- section is better. If the surface temperature of the duct cannot exceed 60°C, find the maximum power rating in kW of the electronics devices that can be located inside the circular cross-section duct. Is it true that circular cross-section is better than a square one for this application?Air at (2.9000x10^2) K is entering in a circular pipe at 101325 Pa as shown in Figure. The velocity of the air at the pipe entrance is (1.00x10^0) m/s. The diameter of the pipe is 0.1m. Specific gas constant of air is 287 J/kg-K. Specific heat of air is 1000 J/kg-K. Find the outlet temperature if 2000 J of heat is added to the pipe.