Determine the convection heat transfer coefficient for the flow of (a) air and (b) water at a velocity of 2 m/s in an 8-cm-diameter and 7-m-long tube when the tube is subjected to uniform heat flux from all surfaces. Use fluid properties at 25°C.
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Determine the convection heat transfer coefficient
for the flow of (a) air and (b) water at a velocity of 2 m/s in
an 8-cm-diameter and 7-m-long tube when the tube is subjected
to uniform heat flux from all surfaces. Use fluid properties
at 25°C.
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- Water at 50°C flows through an automobile radiator tube 0.5 cm inner diameter, 50 cm long with a mean velocity of 1 m/s. The surface of the radiator tube is at 30°C. Determine the heat transfer coefficient using Colburn Analogy. [Use friction factor f= 0.316 Re5 for turbulent and f= 0.184 Re for laminar.] The property values of Water at 50°C and 40°C are 50°C 40°C Density (kg/m) 990 995 Cp (kJ/kg K) 4.182 4.179 k (W/m K) 0.640 0.628 V (m/s) 5.67 x 10"| 6.57 x 107 Pr 3.68 4.34Water is to be heated from 35 °C to 65 °C in a rough tube with a relative roughness of 0.001. The tube has an electric heater provides a constant heat flux such that the tube average wall temperature is 20 °C above the average water bulk temperature. The Reynolds number used for calculating the heat-transfer coefficient is 100,000. Calculate the length of tube required for heating, expressed in meters, if the tube has a diameter of 1 cm.Geothermal steam at 172°C condenses in the shell side of a heat exchanger over the tubes through which water flows. Water "C 4201 J/kg.K, k = 0.673 W/m.°C, p = 968.1 kg/m , µ = 3.33E-4 Pa.s, Pr = 2.08" enters the 4-cm-diameter, 9.5m-long tubes at 20°C at a rate of 0.3 kg/s. What is the exit temperature of water “°C"? Assume fully developed flow, if turbulent flow %3D %3D use, Dittus-Boelter equation: Nu = 0.023 Re Pr. us,8 %3D Select one: А. 150.71 B. 139.86 C. 143.40 D. 147.09 Е. 154.18
- 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 0.6Only handwritten or I'll dislike sure handwrittenHarry up plzCombustion 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.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 0.6Water flows at a rate of 0.8 kg /s in a 2.5 -cm diameter tube whose surface is maintained at a constant temperature of 90°C. If water must be heated from 35°C to 40°C, what is the value of the temperature on which you will base the value of the thermal conductivity that will be used to compute for the convection heat transfer coefficient? Express in Celsus.Hot water is flowing though the center of a AISI 304 stainless steel pipe with a diameter of 300mm, a wall thickness of 10mm and a length of 5m. The pipe is coated with a 2.5mm thick layer of Teflon and covered with a 30mm thick layer of insulation. The water is flowing at a velocity of 0.0015 m/s. Assume the velocity profile to be fully developed. The water is at a temperature of 92°C and the air surrounding the pipe is at 22°C. Some transport properties and dimensions are shown in the table below. 1. What is the heat transfer rate through the pipe and insulation? 2. What is the heat flux at the inner pipe surface and the outer surface of the insulation? 3. What is the temperature of the outer surface of the insulation? Insulation Pipe Too water Uwater Teflon Tm air hair Pipe inner diameter: 300mm Pipe wall thickness: 10mm Teflon Layer thickness: 2.5mm Insulation thickness: 30mm Length: 5m To, water: 92°C Lair: 22°C hair: 75 W/m2/K k30455: 15.2 W/m/K kTeflon: 0.38 W/m/K kinsulation:…Consider 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.Air at atmospheric pressure and 27oC is blown across a long 4.0-cm diameter tube at a velocity of20 m/s. Determine the heat transfer rate per unit length. Assume that the temperature of the wall is 60oC.Recommended textbooks for youElements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University Press
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