d) A 0.3 cm thick aluminum plate (40 W/m. K) has rectangular fins on one side, 0.16 x0.16 cm, spaced 0.6 cm apart. The finned side is in contact with air at 38 °C and h =28.4 W/m².°C. On unfinned side water flows at 93 °C and h = 283.7 W/m2.°C.Calculate (a) efficiency of fins (b) rate of heat transfer per unit area.

Answered: Image /qna-images/answer/aed0fc6f-f239-40e4-a3aa-db4c8ac18fc7.jpg

d) A 0.3 cm thick aluminum plate (40 W/m. K) has rectangular fins on one side, 0.16 x 0.16 cm, spaced 0. 6 cm apart. The finned side is in contact with air at 38 °C and h = 28.4 W/m2. °C. On unfinned side water flows at 93 °C and h 283.7 W/m2.°C. Calculate (a) efficiency of fins (b) rate of heat transfer per unit area. %D

d) A 0.3 cm thick aluminum plate (40 W/m. K) has rectangular fins on one side, 0.16 x 0.16 cm, spaced 0. 6 cm apart. The finned side is in contact with air at 38 °C and h = 28.4 W/m2. °C. On unfinned side water flows at 93 °C and h 283.7 W/m2.°C. Calculate (a) efficiency of fins (b) rate of heat transfer per unit area. %D

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Water at an average temperature of 23 deg C flows through a 10-cm diameter pipe that is 2.5 m long. The pipe wall is heated by steam and is held at 100 deg C. The convective heat transfer coefficient is 2.25 x 10^4 W/m^2K. Find the heat flow in W.
A pipe of 20 cm diameter and 30 km length transports oil from a tanker to the shore with a velocity of 0.318 m/s. The flow is laminar. If u = 0.1 N-s/m2, the power required for the flow would be (a) 9.25 kW (b) 8.36 kW (d) 10.13 kW (c) 7.63 kW
3:10 < Back 1. Ch. 8 An 8-m-long, uninsulated square duct of cross section 0.2 m x 0.2 m and relative roughness 10³ passes through the attic space of a house. Hot air enters the duct at 1 atm and 80°C at a volume flow rate of 0.15 m³/s. The duct surface is nearly isothermal at 60°C. Determine the rate of heat loss from the duct to the attic space and the pressure difference between the inlet and outlet sections of the duct. Evaluate air properties at a bulk mean temperature of 80°C. Is this a good assumption? (Use the Moody chart if you need a friction factor.) Water 2. Ch 8 Liquid water flows at a mass flow rate of 0.7 kg/s through a concentric annulus tube with the inlet and outlet mean temperatures of 20°C and 80°C, respectively. The concentric annulus tube has inner and outer diameters of 10 mm and 100 mm, respectively. The inner tube wall is maintained with a constant surface temperature of 120°C, while the outer tube surface is insulated. Determine the length of the concentric…
?
Water flows along a tube of diameter d = 6 mm with a velocity w = 0.4 m/s. The temperature of the tube wall t = 50°C. What should the length of the tube be to ensure a water outlet temperature tr2 = 20°C at a water inlet temperature twi = 10°C?
Water at 15°C (p = 999.1 kg/m3, cp = 4.18 kJ/kg.K and u = 1.138E-3 kg/m.s k = 0.631 W/m.°C) is flowing steadily in a 4.3-cm-diameter, 9.9- m-length horizontal pipe made of stainless steel at a rate of 1.9 kg/min, the outer surface is subjected, to a uniform heat flux of 6.2 kW/m". Assume fully developed flow. What is the pressure drop in the pipe "in Pascals"? Select one: А. 4.98 B. 5.62 С. 4.26 D. 3.53 O E. 6.26
A steel bar 7 cm long is welded end to end to a copper bar 3 cm long. Each bar has a square cross section 2.00 cm on a side. The free end of the steel with a temprature at 84 °C, and the free end of the cooper bar is at 12 °C. Find the total rate of heat flow in (W)? (ksteel =50.2 W/K.m and kcopper =385 W/K.m ) (Answer in one decimal places) Material having thermal conductivity k Area A T Steel Соpper T,> T,
A conductor with a diameter D= 0.8 cm, covered by an electric current, passes through an environment at T∞= 30 °C with convective heat transfer coefficient h= 120 W/(m² °C). The conductor temperature must be maintained at Ti= 130 °C. Calculate the rate of heat loss per meter of conductor length with:a) the uncoated conductor;b) the conductor covered with bakelite [k = 1.2 W/(m°C)] with a radius corresponding to the critical insulation radius.
1. Experimental analysis was carried out about turbulent convective heat transfer in trapezoidal cross-sectioned duct.Average Nusselt numbers and Reynolds numbers were determined for each experiment and the following data set have beenobtained from this investigation. Find an engineering correlation between the average Nusselt number and Reynolds numberin the form ofNu = aReb
A steel bar 4 cm long is welded end to end to a copper bar 3 cm long. Each bar has a square cross section 2.00 cm on a side. The free end of the steel with a temprature at 63 °C, and the free end of the cooper bar is at 18 °C. Find the total rate of heat flow in (W)? (ksteel =50.2 W/K.m and kcopper =385 W/K.m ) (Answer in one decimal places) Material having thermal conductivity k Area A T2 Steel Copper T,> T
Estimate the natural convection heat transfer coefficient of the horizontal pipe. The outer surface temperature of the pipe is 80 ° C. The ambient air temperature is 40 ° C. The outer diameter of the pipe is 18 cm. Convection coefficient = Answer W / m² ° C.
Refrigerant-134a is being transported at 0.08 kg/s through a Teflon tube of inside diameter D; = 20 mm and outside diameter Do = 25 mm, while atmospheric air at V = 28 m/s and 300 K is in cross flow over the tube. What is the heat transfer per unit length of tube, in W/m, to Refrigerant-134a at 230 K? q' = i W/m Use Hilpert correlation to estimate the external heat transfer coefficient, and please state ALL assumptions.