5. A pin fin of uniform, cross-sectional area is fabricated of an aluminum alloy (k=160 W/m-K). The fin diameter isD=4mm, and the fin is exposed to convective conditions characterized by h=220W/m²-K. It is reported that the finefficiency is n = 0.65. Determine the fin length Z and the fin effectiveness ε. Account for tip convection. Answer: 23.5

Answered: 5. A pin fin of uniform,…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.53P

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1. Determine the heat flow for (i) rectangular fins and (ii) triangular fin of 20 mm length and 3 mm base thickness. Thermal conductivity 100 W/m2K, base temperature = 120°C surrounding fluid temperature = 35°C. Determine also the fin effectiveness. 2. A circumferential fin on a pipe of 50 mm OD is 3 mm thick and 20 mm long. Using the property values and other parameters in 1, determine the: = 45 W/m K. Convection coefficient h= (i) heat flow and effectiveness (ii) If the pitch is 10 mm, determine the increase in heat flow for 1 m length of pipe. Also determine the total efficiency. Circumferential rectangular fin Rectangular and Triangular fins 100 100 80 80 2c 60 * 60 40 40 20 0.5 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 0.5 h 0.5 h kAP 1.5 1.5 L RAP Le = L+ A, = t(r2 - r) A, = 2M(r2,² – r,³) L =L+ "2, = r, + L Rectangular fin A, = tL, L = L A, = 2L, (Depth Triangular fin A, = L 20 Fin efficiency, %
based on the information given here. Steam in a heating system flows through tubes whose outer diameter is 5-cm and whose walls are maintained at a temperature of 180°C. Circular aluminum alloy 2024-T6 fins [k = 186-W/m°C] of outer diameter 6-cm and constant thickness 1-mm are attached to the tube with the space between the fins 4-mm. The efficiency of these fins is 0.97 and the surface area of a single fin is 0.001916 m2. Heat is transferred to the surrounding air at 25°C, with a heat transfer coefficient of 40-W/m2°C. The total heat transfer from the finned tube per meter length in W is approximately 1910 3080 cannot be determined 2495
based on the information given here. Steam in a heating system flows through tubes whose outer diameter is 5-cm and whose walls are maintained at a temperature of 180°C. Circular aluminum alloy 2024-T6 fins [k = 186-W/m°C] of outer diameter 6-cm and constant thickness 1-mm are attached to the tube with the space between the fins 4-mm. The efficiency of these fins is 0.97 and the surface area of a single fin is 0.001916 m2. Heat is transferred to the surrounding air at 25°C, with a heat transfer coefficient of 40-W/m2°C. The surface effectiveness for the finned surface is approximately O 2.56 3.16 1.97 cannot be determined
based on the information given here. Steam in a heating system flows through tubes whose outer diameter is 5-cm and whose walls are maintained at a temperature of 180°C. Circular aluminum alloy 2024-T6 fins [k = 186-W/m°C] of outer diameter 6-cm and constant thickness 1-mm are attached to the tube with the space between the fins 4-mm. The efficiency of these fins is 0.97 and the surface area of a single fin is 0.001916 m2. Heat is transferred to the surrounding air at 25°C, with a heat transfer coefficient of 40-W/M2°C. The increase in heat transfer from the tube per meter length in W is approximately 936 2105 1521 cannot be determined
nt Select D 0 261.40 ( 142. СС 60 Home Insert Space 300c° Insert Draw View Exercise 5 the bobul 3-75 Consider a 5-m-high 8-m-long, and 0.22-m-thick wall whose representative cross section is as given in the figure. The thermal conductivities of various materials used, in W/m-K, are k, = kp = 2, kg = 8, ke=20, kp = 15, and kg = 35. The left and right surfaces of the wall are maintained at uniform temperatures of 300°C and 100°C, respectively. Assuming heat transfer through the wall to be one-dimensional, determine (a) the rate of heat transfer through the wall; (b) the temperature at the point where the sections B, D, and E meet; and (c) the temperature drop across the section F. Disregard any contact resistances at the interfaces. RA p Re RB RC Ro RE ******** ве R=RA + ROBC+R DE + Rr ****** 300°C Ri 1000 1 сгу اللينفب اللوطن يمني نفتي المتريال 5 cm | +100 cm оста 6 cm Pencil + 100°C 0.12 M 10 C
plz answer this,ASAP,thx At high temperatures a nuclear reactor consists of a cylindrical wall composite as the fuel element thorium (k = 57 W/mK) wrapped in graphite (k = 3 W/mK) and helium gas flows through a circular cooling channel. Cylinder length 200 mm. Taking into account the helium temperature = 600°C and the convection coefficient, h= 200 W/m²K. When measured, the outside temperature is 100°C, and h = 5 W/m².K. Draw the electrical analogy, and calculate the overall heat transfer rate!
send me paper solution in proper writing
A steel fin (k = 54 W/m-K) with a cross-section ofan equilateral triangle, 5 mm in side is 80 mmlong. It is attached to a plane wall maintained at400°C. The ambient air temperature is 50°C andthe heat transfer coefficient is 90 W/(m2-K). Calculate the fin efficiency and fin effectiveness, when the fin is considered as a very long fin
You have a steel ball bearing with a diameter of 1.50 cm (k=40.0 W/(m-K); Density = 7800.0 kg/m^3; and specific heat = 600.0 J/(kg-K)). The ball bearing is initially at a uniform temperature of 1100 K and is then suddenly exposed to convection with a convection temperature of 320.0K and a convection coefficient of 25.0 W/(m2-K). Calculate the following: a) Calculate the time required to cool this ball bearing down to a temperature of 410.0 K. b) Calculate the amount of heat removed from the ball bearing during this cooling process.
To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, inside diameter of Di 1 50 W/m-K) has an = 150 mm and wall thickness t; = 20 mm while the outer steel pipe has an inside diameter of = 250 mm and wall thickness to = t¡. Determine the maximum allowable crude oil temperature to ensure the Di, 2 polyurethane foam insulation (kp temperature of T, 0.0675 W/m-K) between the two pipes does not exceed its maximum service = 70°C. The ocean water is at T o, 0 = -5°C and provides an external convection heat transfer р, таx coefficient of ho = 500 W/m2.K. The convection coefficient associated with the flowing crude oil is h; = 450 W/m2-K. (2) It is proposed to enhance the performance of…

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