Question

In: Mechanical Engineering

Aluminum fins of triangular profile are attached to a plane wall whose surface temperature is 100°C....

Aluminum fins of triangular profile are attached to a plane wall whose surface temperature is 100°C. The fin base thickness is 2.0 mm, and its length is 10 mm. The system is in ambient air at a temperature of 20°C, and the surface convection coefficient is 40 W/m2·K. (a) What are the fin efficiency and effectiveness? (b) What is the heat dissipated per unit width by a single fin?

(a)nf=

ef=

(b)q'f=

Solutions

Expert Solution


Related Solutions

A composite series wall has an inside surface temperature of 1600F and outside surface temperature of...
A composite series wall has an inside surface temperature of 1600F and outside surface temperature of 500F. If it consists of 3.5 in. of mineral wool, 0.05 in. of plaster on the outside, and 0.75 in. of cork board on the inside, determine the heat loss in a 120 square foot of wall.
If an aluminum oxide at room temperature (25°C) is placed on hot oven where it's surface...
If an aluminum oxide at room temperature (25°C) is placed on hot oven where it's surface is heated to 100°C at time t=0, how long would it take for the material to reach 80°C, 1 mm from the surface? Thermal diffusivity of the aluminum oxide is 11 cm²/s. The answer should be in milliseconds. Hint: Apply the Fick's second law. SUBMIT YOUR SOLUTION! material science course
A plane wall is a composite of three materials, A, B and C. The wall of...
A plane wall is a composite of three materials, A, B and C. The wall of material A has uniform heat generation q˙ of 100000 W/m3, kA = 75 W/m K, and thickness LA = 60 mm. The wall material B has no generation with kB = 150 W/m K and thickness LB = 20 mm. The wall material C has no generation with kC = 100 W/m K and thickness LC = 20 mm The inner surface of material...
1. A 100 g ice cube at -10?C is placed in an aluminum cup whose initial...
1. A 100 g ice cube at -10?C is placed in an aluminum cup whose initial temperature is 70?C. The system comes to an equilibrium temperature of 20?C. What is the mass of the cup in kg. 2.Radiation from the head is a major source of heat loss from the human body. Model a head as a 20-cm-diameter, 20-cm-tall cylinder with a flat top.If the body's surface temperature is 36 ?C , what is the net rate of heat loss...
Aluminum (FCC) with atom radius of 0.1431nm. Find the distance between aluminum lattice plane (100) and...
Aluminum (FCC) with atom radius of 0.1431nm. Find the distance between aluminum lattice plane (100) and (111), and calculate the density of that planes.
Consider a very long rectangular fin attached to a flat surface such that the temperature at...
Consider a very long rectangular fin attached to a flat surface such that the temperature at the end of the fin is essentially that of the surrounding air, i.e. 20°С. Its width is 5.0 cm; thickness is 1.0 mm; thermal conductivity is 200 W/m·K; and base temperature is 40°C. The heat transfer coefficient is 20 W/m2 .K. You can use Table 1(a) for assistance. (i) Estimate the fin temperature at a distance of 5.0 cm from the base, and; (ii)...
A heating system is designed to keep the inner wall surface temperature of a room at...
A heating system is designed to keep the inner wall surface temperature of a room at 25C. Only one wall of the room is contacted with the outer environment. The crosssectional view of the wall is schematically shown in Fig. H1. The height, width and thickness of the wall are 2.5 m, 10 m and 0.2 m, respectively. The wall is made from red bricks with a thermal conductivity of 0.72 W/m.K and solar absorptivity of s = 0.63. The...
A stainless-steel rod (AISI 304) of length ? = 100[??] and triangular cross-section is attached between...
A stainless-steel rod (AISI 304) of length ? = 100[??] and triangular cross-section is attached between two isothermal heat sinks at ?0 = 50℃. The rod perimeter is ? = 5[??]. When an unknown fluid at ?0 = 23℃ is in cross-flow over the rod, the temperature of the rod is midway between its two ends is measured to be ???? = 25℃. Determine the value of the convection heat transfer coefficient and the rate of heat loss from the...
A 100 kg uniform beam is attached to a vertical wall at one end and is...
A 100 kg uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. Calculate the magnitude of the vertical component of the force that the wall exerts on the left end of the beam if the angle between the cable and horizontal is θ = 43°. The angle between the horizontal and the beam is 30 degrees.
You have 520 g of aluminum at an initial temperature of 350 °C. (Aluminum has a...
You have 520 g of aluminum at an initial temperature of 350 °C. (Aluminum has a specific heat capacity c = 0.214 cal/(g°C).) You place it into a beaker filled with 860 g of water at an initial temperature of 18 °C. (Water has a specific heat capacity c = 1.0 cal/(g°C).) Assume that no phase changes or chemical reactions occur during this time. Calculate the final temperature of the aluminum~and water.​ Calculate the amount of heat that enters the...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT