Air at 10oC enters a 10-cm-diameter and 4-m-long pipe at a rate of 0.035 kg/s. The inner surface of the pipe has a roughness of 0.22 mm, and the pipe is nearly isothermal at 60o Determine the rate of heat transfer to air using the Nusselt number relation given by (a) Eq. 8–66 and (b) Eq. 8–71. Evaluate air properties at a bulk mean temperature of 20oC. Is this a good assumption?
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Air at 10oC enters a 10-cm-diameter and 4-m-long pipe at a rate of 0.035 kg/s. The inner surface of the pipe has a roughness of 0.22 mm, and the pipe is nearly isothermal at 60o Determine the rate of heat transfer to air using the Nusselt number relation given by (a) Eq. 8–66 and (b) Eq. 8–71. Evaluate air properties at a bulk mean temperature of 20oC. Is this a good assumption?
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- Hot air leaving the stove in the kitchen of a house at 70 0C, with a square section of 22 cm x 22 cm. sheet metal enters the 12 m long section of the channel with a speed of 6 m/s. Emissivity 0.3 The outer surface of the duct, whose thermal resistance is neglected, is located in the basement of the house at 14 0C and 12 W/m2 . It is in contact with cold air with 0C convection heat transfer coefficient. Basement Find the heat loss rate from the hot air in the duct to the floor by taking the wall temperatures of the floor to 14 0C.A constant heat flux of 40 W/cm² is applied from the outside to the three surfaces (top surface adiabatic) of a 6cmx6cm square pipe. Water enters the pipe at 25°C and its flow rate is 1 kg/s. If the length of the channel is 1.5 m, what will the outlet temperature of the water be? You can get the properties of water at 320K.HEAT TRANSFER,PLEASE GIVE COMPLETE WORKING Hot air at 80ºC enters an 8-m-long pipe at a rate of 0.15 kg/s. The pipe is considered as thin wall with diameter of 20 cm. The wall of the pipe is observed to be nearly at isothermal at 60ºC. The fluid properties of the hot air is as given on Table 1. Determine: The temperature of the air at the exit of the pipe. The heat loss from the hot air. Table 1: Thermo-physical properties for hot air k = 0.02953 W/m·K µ = 20.96×10-6 N·s/m2 Pr = 0.7154 cp = 1008 J/kg·K
- Local Nusselt number for fully developed (hydrodynamically and thermally) turbulent flow in a smooth circular tube is defined by Nup-hD/kr, where h, D, and ke are the convective heat transfer coefficient, tube diameter, and fluid thermal conductivity, respectively. The friction factor for the smooth circular tube is given by the Blasius correlation, f-0.316Rep. The Reynolds number is defined by Ren-pviD/, where pr, vi, and ur are the fluid density, fluid velocity, and fluid viscosity, respectively. The Blasius correlation is applicable to Rep<2×10¹. Considering the analogy between velocity and thermal boundary layers and using the Blasius correlation, express the local Nusselt number using Reynolds and Prandtl numbers in the form of Nup-AxRepxPr. The Prandtl number is defined by Pr-wa, where and are the fluid kinematic viscosity and fluid thermal diffusivity, respectively. Note that the local Nusselt number formula should be applicable to Rep<2x10 and 0.6Question 2 Air (Cp= 1.005 kJ/kg.°C) enters a 7-m-long, 7.2-cm-diameter pipe at 63°C at a rate of 0.06 kg/s. The air cooled at an average rate of 320 W/m² surface area of the pipe. The air temperature at exit of the pipe is:Liquid mercury is flowing at 0.9kg/s through a 5-cm diameter tube with inlet and outlet mean temperatures of 100°C and 200°C, respectively. The tube surface temperature is maintained constant at 250°C. Determine the tube length using the Dittus-Boelter equation, in m. ______ mA 65 kg beef carcass (k-0.47 w/mk and a-0.13 x10-6 m/s) initially at a uniform temperature of 37 "C is to be cooled by refrigerated air at -10 oC flowing at a velocity of 1.2 ms. The average heat transfer coefficient between the carcass and the air is 22 W/m²K. Treating the carcass as a cylinder of diameter 24 cm and the height 1.4 m and disregarding heat transfer from the base and top surfaces, Determine how long it will take for the centre temperature of the carcass to drop to 4 °C b. Also, determine if any part of the carcass will freeze during this process Hava- air -10 °C 12m/s Sider E Beef JTCAir at atmospheric pressure flowing through a tube of 10 cm diameter at a rate of 0.1 kg/s is to be cooled from 400K to 300K with uniform wall temperature of 250K. Determine the length of the tube. Justify any assumptions that you have made.Combustion gases passing through a 5-cm-internal-diameter circular tube are used to vaporize waste water at atmospheric pressure. Hot gases enter the tube at 225 kPa and 250oC at a mean velocity of 2.5 m/s, and leave at 150o If the average heat transfer coefficient is 150 W/m2K and the inner surface temperature of the tube is 110oC, determine (a) the tube length and (b) the rate of evaporation of water.Water is to be heated from 15°C to 65°C as it flows through a 3-cm-internaldiameter 5-m-long tube . The tube is equipped with an electric resistance heater that provides uniform heating throughout the surface of the tube. The outer surface of the heater is well insulated, so that in steady operation all the heat generated in the heater is transferred to the water in the tube. If the system is to provide hot water at a rate of 10 L/min, determine the power rating of the resistance heater. Also, estimate the inner surface temperature of the tube at the exit.Local Nusselt number for fully developed (hydrodynamically and thermally) turbulent flow in a smooth circular tube is defined by Nup-hD/kr, where h, D, and kr are the convective heat transfer coefficient, tube diameter, and fluid thermal conductivity, respectively. The friction factor for the smooth circular tube is given by the Blasius correlation, f-0.316Red ¹/4. The Reynolds number is defined by Rep-prviD/μr, where pr, vr, and ur are the fluid density, fluid velocity, and fluid viscosity, respectively. The Blasius correlation is applicable to Rep<2×10¹. Considering the analogy between velocity and thermal boundary layers and using the Blasius correlation, express the local Nusselt number using Reynolds and Prandtl numbers in the form of NuD-A-ReDxPr. The Prandtl number is defined by Pr-war, where and ar are the fluid kinematic viscosity and fluid thermal diffusivity, respectively. Note that the local Nusselt number formula should be applicable to Rep<2×10 and 0.6Consider a pipe with a length of 25 m and diameter of 5 cm. The surface temperature of the pipe is constant at 150°C.Oil at 20°C is passing though this pipe with a mass flow rate of 0.5 kg/s. determine (a) the temperature of the oil at the exit and (b) the total heat transfer rate. Note. Report your solution step by step and clearly.SEE MORE QUESTIONSRecommended textbooks for youElements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University Press
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