Question 4: A bar 10 cm long and 5 mm in thickness extends straight from a molding at 212.5 °C. The bar is in an air with ?∞ = 32.5°C and h = 30 W/m2 .K. Calculate the temperature of the bar 20, 40, and 80 mm from the molding? (The rod material is brass)
Question 4: A bar 10 cm long and 5 mm in thickness extends straight from a...
3.106 A brass rod 100 mm long and 5 mm in diameter extends horizontally from a casting at 200°C. The rod is in an air environment with T = 20°C and h = 30 W/m - K. What is the temperature of the rod 25, 50, and 100 mm from the casting?
6 brass rod 100 mm long and 5 mm in diameter 3.1 extends horizontally from a casting at 200°C. Th is in an air environment with Too = 20°C and h = 30 Wim.K. What is the temperature of the rod 25, 50, and 100 mm from the casting? 10 e rod We were unable to transcribe this image 6 brass rod 100 mm long and 5 mm in diameter 3.1 extends horizontally from a casting at 200°C. Th is...
Problem 3-2 A brass rod 100 mrn long and 5 mm in diameter extends horizontally from a casting at 203°C. The rod is in an air environment with T-25°C and h- 30 W/m2K. Determine the temperature of the rod 75 and 100 mm from the casting. The thermal conductivity of brass is 133 W/mK
One end of a long rod 3 cm in diameter is inserted into a furnace with the (3 outer end projecting into the outside air. Once the steady state is reached the temperature of the rod is measured at two points, 15 cm apart and found to be 140°C and 100°C, when the atmospheric air is at 30°C with convection coefficient of 20 W/m2.K. Calculate the thermal conductivity of *.the rod material Consider a stainless steel spoon(k = 15.1 W/m.K), partially...
A long steel bar with a diameter of 4 cm (ρ = 7840 kg / m3 , cp = 580 J / kg ° K, k = 52 W / mK, α = 1.21x10-5 m2 / s), internal enters the 2 m long moving belt heat treatment furnace at ambient temperature of 900 ° C at 40 ° C. Since the film coefficient in the oven is 100 W / m2K, the center axis temperature of the bar at the...
4. A long square steel bar 2L - 7 cm wide by 21 - 7 cm high having a thermal conductivity k, = 14 W/n'c and a thermal diffusivity a 3.63x10 m/s is hot rolled at T. - 615°C and then cooled by air issuing from jets at T. -30°c. After t - 287 s have elapsed, the temperature at the center of the bar T(0,0,t) - 240c and the temperature at the corners of the bar T(L,Lt) - 125c....
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm is covered with an insulation material [k 0.2 W/(m. C)] of thickness 2 cm. A hot gas at 320°C with a heat transfer coefficient of 200 W/(m2.C) flows inside the tube. The outer surface of the insulation is exposed to cooler air at 20°C with a heat transfer coefficient of 50 W/(m2·°C). Calculate a) The heat loss from the tube to the air for...
A brass rod, 1 cm in diameter and 15 cm long, with a tip subject to a breeze with a convection coefficient of 68 W/m2 K in a room where the ambient air temperature is 23°C. The base is 79°C and the tip is designed to maintain a constant temperature of 29°C. The manufacturer finds that the thermal conductivity, in units of W/m*K, to be k(T) 43*In(T)- 128, where T is in units of Kelvin. Plot the temperature profile for...
A long rectangular copper bar of a cross section of 2cm by 3cm and a long cylindrical copper rod of 2.2 cm in diameter are initially at a uniform temperature of 120 °C. They are then exposed to a cooling air stream at 22 °C with a heat transfer coefficient of 180 W/m-K. Taking the properties of the copper to be k = 400 W/m-K and p-8930 kg/m', and C -0.385 kJ/kg-K, determine: a How long would it take for...
3.1 The height, length, and thickness of a longitudinal fin of 6061 aluminum are 3.2 cm, 15 cm, and 2 mm, re- spectively. If the fin base is maintained at a temperature of 55°C and the surrounding air temperature is 20°C, where the heat-transfer coefficient is 34 W/m2.K, what is the heat transfer from the fin?