Determine the pipe length if the pipe is heated with a constant surface heat flux of 300 W/m2 i- constant
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Heat Transfer
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- Shown in the figure,a card is cooled with water. To cool the cardWater 0.4 m / s in the circular pipe system placed on the bottomaverage speed and entering at a temperature of 20 oC, at a temperature of 24 oCcomes out. Electronic components on the board of 1.5 kWthey produce energy. At the same time, from the card surface to the mediumApproximately 0.05 kW of heat loss occurs by convection. Continuous flowFind the mass flow rate of the water for the conditions. Specific heat of waterYou can get = 4.22 as ?? / ???.Heat Transfer (Third year) 2020- 2021 Homework 01-03-2021 By Dr. Basil Noori Merzah one-dimensional heat transfer and disregarding radiation, determine the rate of heat transfer through the wall. Q4/ Steam at T01-320°C flows in a cast iron pipe (k=80W/m. C) whose inner and outer diameters are D,=5cm, and D,-5.5cm, respectively. The pipe is covered with 3 cm thick glass wool insulation with k=0.05W/m. C. Heat is lost to the surroundings at T2-5°C by natural convection and radiation, with a combined heat transfer coefficient to be h,=18W/m."C. Taking the heat transfer coefficient inside the pipe to be 2 0 h,-60W/m. C, determine the rate of heat loss from the steam per unit length of the pipe. Also determine the temperature drops across the pipe shell and the insulation. Q5/ Determine the overall heat transfer coefficient U based on the outer surface of a D=2.5cm, and D =3.34 cm steel pipe (k=54.0W/m. C) for the following conditions: inside and outside heat transfer coefficients are…Water (5.2 L'min) is flowing in a tube "D-3 cm, L- 5 m" and is to be heated from 15 C to 59.9°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)? If turbulent flow use Dituss-Boetler relation Nu- 0.023 Re Pr. ed 2.00 08 on Properties : p= 992.1 kg/m , C,-4179 J/kg. C, k= 0.631 W/wm°C, Pr = 4.32, v = 0.658E-6 Select one: O A 20.55 O B. 17.63 O.19.17 O D. 14.58 O E. 16.13
- 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.Determine the length of the pipe required to cool the pasteurized orange juice from 65 to 22 °C at a rate of 1500 kg/hr in a 3 cm diameter pipe . The stream of chilled water is flowing from 4 to 20 °C, against the direction of the orange juice. The overall coefficient of heat transfer from the water to the orange juice is 900 J/m2s °C and the specific heat of the orange juice is is 3890 J/kg °C .350 pipes are fixed as square in a pipe bundle used for condenser. PipeThe outer diameters are 8 mm and the steam at 0.2 bar is desired to be condensed on the pipes. pipe outer The surface temperature is kept constant at 30 °C. If the length of the pipes is 1.5 m, the heat transferred in the systemCalculate the amount of energy and the amount of condensed steam
- Water (7.7 L/min) is flowing in a tube "D = 3 cm, L= 5 m" and is to be heated from 15°C to 62.1°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)? If turbulent flow use Dituss- Boetler relation Nu= 0.023 Re0.8 Pr". Properties : p = 992.1 kg/m³ , C, = 4179 J/kg.°C, k = 0.631 W/m°C, Pr = 4.32, v = 0.658E-6 m²/sLocal 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 0.6In a thermal power plant, a horizontal copper pipe of "D" diameter, "L" length and thickness 1.9 cm enters into the boiler that has the thermal conductivity as 0.37 W/mK. The boiler is maintained at 102 °C and temperature of the water that flows inside the pipe is at 34°C. If the energy transfer (Q) is 100735 kJ in 7 hours. Determine the Heat transfer rate, Surface area of the pipe and Diameter & Length of the pipe, if D = 0.015 L .Oil is flowing through a 50 mm-ID and 55 mm-OD pure iron pipe at 1 m/s. It is being heated by steam outside the pipe and steam film coefficient may be taken as 11 kW/m2°C. At a particular point along the pipe, the oil is at 50°C, its density is 880 kg/m³, its viscosity is 2.1 cP, its thermal conductivity is 0.135 W/m°C and its specific heat is 2.17 J/g°C. What is the overall heat transfer coefficient at this point, based on the inside area of the pipe? If the steam temperature is 130°C, what is the heat flux at this point, based on the outside area of the pipe?Q1: Consider a wall heated by convection on one side and cooled by convection on the other side. Show that the heat-transfer rate through the wall is T1-T2 1/h A+A/kA+ 1/h2A Where T; and T; are the fluid temperatures on each side of the wall and h, and h; are the corresponding heat-transfer coefficients.Let's practice how to use energy conservation in conjunction with Nusselt number correlations. A cooling system cools air from 80°C to 20°C by passing air via a 20-cm diameter circular duct. The duct provides a uniform cooling at a rate of 200 W/m². The air flows at a steady rate of 3 m/s. What is the required length of the cooling system*? What is the temperature of the duct surface at 15-m from the entry point?SEE MORE QUESTIONS