Water from an industrial process flows through a long pipe of diameter 0.2m at a mass flow of 1.25 kg/s. The surface of the pipe is held at a constant temperature of 10°C. How long must the pipe be if the water enters at 83°C is desired to be cooled to 25°C? Be sure to justify the validity of your chosen correlation.
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- The liquid food is flowed through an uninsulated pipe at 90 ° C. The product flow rate is 0.3 kg / s and has a density of 1000 kg / m³, specific heat 4 kJ / (kg K), a viscosity of 8 x 10-6 Pa s, and a thermal conductivity of 0.55 W / (m) K). Assume that the change in viscosity is negligible. The internal diameter of the pipe is 30 mm with a thickness of 3 mm made of stainless steel (k = 15 W / [m ° C]). The outside temperature is 15 ° C. If the outer convective heat transfer coefficient is 18 W / (m² K), calculate the heat loss at steady state per meter pipe length. a. Find the convection coefficient in pipe = W / m² ° C. b. Calculate heat loss per meter pipe length = wattsThe liquid food is flowed through an uninsulated pipe at 90 ° C. The product flow rate is 0.4 kg / s and has a density of 1000 kg / m³, specific heat 4 kJ / (kg K), a viscosity of 8 x 10-6 Pa s, and a thermal conductivity of 0.55 W / (m) K). Assume that the change in viscosity is negligible. The internal diameter of the pipe is 20 mm with a thickness of 3 mm made of stainless steel (k = 15 W / [m ° C]). The outside temperature is 15 ° C. If the outer convective heat transfer coefficient is 18 W / (m² K), calculate the heat loss at steady state per meter of pipe length. a.Find the convection coefficient in the pipe = AnswerW / m² ° C. b. Calculate heat loss per meter pipe length = Answerwatt.Water flows at a rate of 0.1 kg/s in a tube with a diameter of 250 mm. The tube is heated uniformly at a rate of 135 kW/m2. Find the wall temperature at a location where Tsat = 180 C and x = 25%. [Ans.: Ts = 188 C]
- 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.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. It will under compressible or incompressible criteria. (use Perry's Handbook for the properties and constants) R = 8314J/kgmol.K; MW=18.02g/molAir at 1.7 atm gauge and 15°C enters a horizontal 75-mm steel pipe that is 70 m long. The velocity at the entrance of the pipe is 60 m/s. Assuming isothermal flow, what is the pressure at the discharge end of the line? ANSWER SHOULD BE 1.982 atm
- A 2-cm diameter, 10-m long tube transports water at an average flow velocity of 8 m/s. The water enters at 20°C and leaves at 30°C. To compute for the Nusselt number of the water flow, what is the exact value of the temperature in °C on which the water properties should be based?In this problem our goal is to compare pressure drop for the flow of an incompressible fluid in a straight pipe to the pressure drop of a compressible fluid in the same pipe and under the same conditions. For the incompressible case, consider the flow of water at a rate of 5000 lbm/s in the pipe. Then compare the results with the flow of air. The pipe is smooth and has a diameter of 1 in and length of 20 ft. For both cases, fluid enters the pipe at 14.7 psia and 100 F and leaves the pipe at the same temperature.1. A lead pipe has 2 cm inside diameter, 3 cm outer diameter, length of 130 cm. Liquid water at 4°C flows through the pipe with a bulk velocity of 2.50 km/hr. Air is blown around the outside of the pipe at 20 deg C. The inside wall of the said pipe has a temperature of 8 deg Celsius. Density of liquid water= 999.6509 kg/m³ Cp=4.218 kJ/kgK Viscosity of liquid water= 1.6193x10-3 Pa.s k (thermal conductivity of water) = 0.5742 W/mK Find: Overall heat coefficient (U) based on outside surface area b. Prandtl (Pr) and Reynolds (Re) numbers based on classification of flow а.
- 1. A lead pipe has 2 cm inside diameter, 3 cm outer diameter, length of 130 cm. Liquid water at 4°C flows through the pipe with a bulk velocity of 2.50 km/hr. Air is blown around the outside of the pipe at 20 deg C. The inside wall of the said pipe has a temperature of 8 deg Celsius. Density of liquid water= 999.6506 kg/m³ Cp water=4.2184 kJ/kgK Viscosity of liquid water= 1.6202 x10-3 Pa.s k1 (thermal conductivity of water) = 0.5742 W/mK k2 (thermal conductivity of lead) = 34.92 W/mK Find: a. Overall heat coefficient (U) based on outside surface area b. Prandtl (Pr) and Reynolds (Re) numbers based on classification of flowWater flows at 5m/s is passed through a tube of 2.5 cm diameter, it is found to be heated from 20degC to 60degC. The heating is achieved by condensing steam on the surface of the tube and subsequently the surface temperature of the tube is maintained at 90degC. Water properties are as follows: density=995kg/m3, kinematic viscosity=.657x10-6 m2/s, Pr=4.43, k=.628W/mK, cp=4178J/kgK. Determine the Reynolds number Round your answer to 2 decimal places. What is the thermal coefficient Round your answer to 2 decimal places. what is the heat absorbed by the water? Round your answer to 2 decimal places.8. A lead pipe has 2 cm inside diameter, 3 cm outer diameter, length of 130 cm. Liquid water at 4°C flows through the pipe with a bulk velocity of 0.03 km/hr. Air is blown around the outside of the pipe at 20 deg C. The inside wall of the said pipe has a temperature of 8 deg Celsius. Density of liquid water= 1000 kg/m³ Cp water=4.210 J/kgK Viscosity of liquid water= 1.5674 x10° Pa.s thermal conductivity of lead = 35 W/mK thermal conductivity of water = 0.575 W/mK Find: Overall heat coefficient (U) based on outside surface area b. System's heat transfer rate Prandtl (Pr), Reynolds (Re) numbers and type of flow а. с.