Water flows in a 3.5-cm-diameter pipe so that the Reynolds number based on diameter is 2000 (laminar flow is assumed). The average bulk temperature is 10◦C. What would the heat transfer coefficient be in W/m2-°C for such a system if the tube wall was subjected to a constant heat flux and the velocity and temperature profiles were completely developed? Evaluate properties at bulk temperature.
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Water flows in a 3.5-cm-diameter pipe so that the Reynolds number based on diameter is 2000 (laminar flow is assumed). The average bulk temperature is 10◦C. What would the heat transfer coefficient be in W/m2-°C for such a system if the tube wall was subjected to a constant heat flux and the velocity and temperature profiles were completely developed? Evaluate properties at bulk temperature.
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- A 10mm diameter and 20m long smooth tube is maintained at a constant surface temperature. Water enters the tube at 25 °C with mass flow rate of 0.01 kg/s. Properties of water at average mean temperature are: K= 0.65W/m.K, dynamic viscosity = 0.486X10^-3 Kg/m.s, Pr = 3.12 The flow at the end of the pipe is ?Heated air at 1 atm and 100°F is to be transported in a 900-ft-long circular section plastic duct at a rate of 1.4 lb/s. I want to determine the head loss and pumping power at the three diameter values in the table below. Complete the table to help me choose a wise diameter. Why would a good design not only focus on minimizing the pumping power? Diameter Head loss, hi Pumping power, W Reynolds number, Re n.d. f n.d. (in) ft hp 8 12 16What is the Reynolds number of a fluid flowing in a tube with an inside diameter of 2 inches? The viscocity is 1.358 x 10^-5 lb/ft-s and the mass flow rate is 73 lb/h.
- Fluid is flowing through a 20 mm inside diameter and 25 mm outside diameter brass tube at no leaking with temperature at 65℃ and length of 10 m. Surface conduction of hot fluid is 5.2W/(m^2℃) and thermal conductivity of brass is 12.84W/(m℃). Brass tube is covered by silica of 6 mm thickness with thermal conductivity of 13.84W/(m℃) . Outside of it, is a fluid with 45℃ with surface conductance of 3.2W/(m^2℃). Find the heat transfer from the hot fluid with temperature of 65℃ to fluid with temperature of 45℃.An coconut oil (considered as viscous fluid) must be pumped between two buildings in an agro-industrial plant through an AISI 304 stainless steel pipe spread on the ground that has an outside diameter of 22 cm and 110 m long. To facilitate pumping, the liquid will be heated to 40 ° C in order to reduce its viscosity. The oil flow rate will be 20 Kg / s and the specific heat will be 1300 J / Kg K. Determine the temperature drop that the liquid will experience along the pipeline under the following operating conditions:Ambient air temperature = 10 ° CWind speed = 14 m / sPipe surface temperature = 37 ° C- EXAMPLE 8-1 Laminar Flow in Horizontal and Inclined Pipes Consider the fully developed flow of glycerin at 40°C through a 70-m-long, 4-cm-diameter, horizontal, circular pipe. If the flow velocity at the centerline is measured to be 6 m/s, determine the velocity profile and the pressure dif- ference across this 70-m-long section of the pipe, and the useful pumping power required to maintain this flow. For the same useful pumping power input, determine the percent increase of the flow rate if the pipe is inclined 15° downward and the percent decrease if it is inclined 15° upward. The pump is located outside this pipe section. D-2 em 6 m/s Glycerine Hello sir, I want the same solution, but in a simplified way without the words of simplifying the solution. ur) - u I- Substituting, the velocity profile is determined to be u(r) - (6 m/s)1- - 6(1-2500r) (0.02 m) where u is in m/s and r is in m. The average velocity, the flow rate, and the Reynolds number are 6 m/s V - Vs - 3 m/s V - VvA-…
- - EXAMPLE 8-1 Laminar Flow in Horizontal and Inclined Pipes Consider the fully developed flow of glycerin at 40°C through a 70-m-long, 4-cm-diameter, horizontal, circular pipe. If the flow velocity at the centerline is measured to be 6 m/s, determine the velocity profile and the pressure dif- ference across this 70-m-long section of the pipe, and the useful pumping power required to maintain this flow. For the same useful pumping power input, determine the percent increase of the flow rate if the pipe is inclined 15° downward and the percent decrease if it is inclined 15° upward. The pump is located outside this pipe section. D-2 em 6 m/s Glycerine Hello sir, I want the same solution, but in a simplified way without the words of simplifying the solution. ur) - uma 1- Substituting, the velocity profile is determined to be ur) - (6 m/s)I - - 6(1 - 2500r) (0.02 m) where u is in m/s and r is in m. The average velocity, the flow rate, and the Reynolds number are V - Vavs 4max 6 m/s - 3 m/s…Obtain by dimensional analysis a functional relationship for the wall heat transfer coefficient h (W/m2-K) for a fluid flowing through a straight pipe of circular cross section. Assume that the effects of natural convection may be neglected in comparison with those of forced convection. Taking the heat transfer coefficient, h, as a function of the fluid velocity, density, viscosity specific heat and thermal conductivity, v, p, H, Cp and k, respectively, and of the inside diameter of the pipe, d. For recurring set, the variables d, u, k, and p. It found by experiment that, when the flow is turbulent, increasing the flowrate by a factor of 2 always results in a 60 percent increase in the coefficient. How would a 50 percent increase in density of the fluid be expected to affect coefficient, all other variables remaining constant?Air flows through a 10 cm internal diameter tube at the rate of 75 kg/hr. Measurements indicate that the temperature of air is 325 K while the tube wall temperature is 375 K. The heat transfer rate for one meter length in the range of this point is Given data: Thermo physical properties of air at 325 K k = 0.02792 W/mk u = 1.967 x 10-5 kg/ms Pr = 0.713 Nu = 3.66 for laminar Nu = 0.023 Re8 P4 for turbulent.
- 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 0.6A 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?Water (5.0 L/min) is flowing in a tube "D = 3 cm, L= 5 m" and is to be heated from 15°C to 64.0°C by applying a uniform heat flux on the outer surface of the tube by electric resistance heater. What is the power rating of the resistance heater (kW)? 00 0.8 If turbulent flow use Dituss-Boetler relation Nu= 0.023 Re Pr. 3 Properties : p = 992.1 kg/m ,C = 4179 J/kg. °C, k = 0.631 W/m°C, Pr= 4.32, v = 0.658E-6 1m/sSEE MORE QUESTIONS