4. For a thermally fully developed flow in a pipe for a fluid with constant properties, the local convection coefficient (a) Decreases as x-1/2 (b) Decreases as x-1/5 (c) Increase as x1/2 (d) Increases as x4/5 (e) Remains constant
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- 1. Heated air at 1 atm and 35°C is to be transported in a 150-m-long circular plastic duct at a rate of 0.35 m³/s (Fig. 1). If the head loss in the pipe is not to exceed 20 m, using the Colebrook equation and consulting with the FE Reference Handbook and appropriate table(s) for equations and properties. Write a Matlab code to determine the i. ii. iii. iv. minimum diameter of the duct, the friction factor, average flow velocity and Reynolds number of the flow 0.35 m³/s air D -150 m Fig 1The 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.
- Pinch temperature at hot stream is 70C, while at cold stream is 60CAir 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:A shell-and-tube heat exchanger is used to cool compressed liquid methanol from 176 °F to 104 °F. The methanol flows on the shell side of the exchanger. The coolant is water that rises in temperature from 50 °F to 86 °F and flows within the tubes at a rate of 68.9 kg s1. Finding the appropriate thermophysical data and applying the proper equations, you are required to do the following: (a) Calculate i) methanol mass flow rate in the exchanger, ii) methanol volumetric flowrate at the inlet of the exchanger. (b) i) For the counter-current flow of the fluids calculate the log temperature difference, ii) explain the purpose of calculating this difference, iii) explain, quantitatively, why is the counter-current flow in heat exchangers preferred to co-current flow. mean
- 6 m 6 m Elbow 6 m 3 m. Activate Wind Goto Sectines1 15 m A fluid is pumped at a rate of 0.00156 m/s through a 0.025-m-diameter pipe to fill a 9°C 020Pls do neatly nd correctlyA 1-in-diameter (D = 1 inch) rotating machined shaft has a groove 0.1-in deep with a 0.1-in radius machined into it. The shaft is subjected to a pulsating (i.e. R = 0) torque and bending moment of following values. Based on laboratory experiments at 550°F, Sut = 150 ksi, Sy = 120 ksi, and S'e = 90 ksi are measured. Using mod-Goodman equation and for operating temperature of 550°F and 90% reliability, determine the factor of safety for yielding and fatigue of this shaft. Tmax = 2000 Ib-in Mmax = 1600 lb-in Mmin = -1200 Ib-in D - -d- M T M T
- 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. What is the % of pressure drop? (use Perry's Handbook for the properties and constants) R = 8314J/kgmol.K; MW=18.02g/mol3- Consider the flow of fluid between two large parallel isothermal plates separated by a distance L. The upper plate is moving at a constant velocity of V and maintained at temperature T, .The lower plate is stationary and a constant heat flux ( q") is being applied from lower plate to fluid. By simplifying and solving the continuity, momentum and energy equations, obtain relations for temperature and velocity of fluid according to location. (Frictional heating due to viscous dissipation is negligible.) To L Fluid q"SOLVE SIMPLY SO I CAN UNDERSTAND :)FINAL ANSWERS MUST BE ROUND TO 4 DECIMAL PLACES AND BOXED!