Problem 2: A molten aluminum alloy at 900 K is poured into a cylindrical container that...
An aluminum plate with a thickness of L=5 mm is mounted in a horizontal position, and its bottom surface is well insulated. A special, thin coating (with emissivity and solar absorptivity of 0.25) is applied to the top surface. The density ρ and specific heat c of aluminum are known to be 2700 kg/m3 and 900 J/kg · K, respectively. Consider conditions for which the plate is initially at a temperature of ??????=25 °C and its top surface is suddenly...
3. A small cylindrical filament is heated in a large combination convection-radiation oven. The filament has a diameter D= 50 mm and length L= 1 m. During the process, the oven wall temperature is fixed at Tsur=800 K, and the hot air is blowing with a temperature T.= 500 K and an average heat transfer coefficient h=50 W/m²K. Assuming the filament surface is opaque and diffuse, and it has a spectral emissivity as shown below: (25 pts) The oven walls behave...
A truncated cone 30 cm high is constructed of aluminum [k = 204 W/m 0C]. The diameter at the top is 7.5 cm, and the diameter at the bottom is 12.5 cm. The lower surface is maintained at 93 °C; the upper surface, at 540 °C. The other surface is insulated. Assuming one dimensional heat flow, what is the rate of heat transfer in watts?
A small cylindrical filament is heated in a large combination convection-radiation oven. The filament has a diameter \(\mathrm{D}=50 \mathrm{~mm}\) and length \(\mathrm{L}=1 \mathrm{~m}\). During the process, the oven wall temperature is fixed at \(\mathrm{T}_{\text {sur }}=800 \mathrm{~K}\), and the hot air is blowing with a temperature \(\mathrm{T}_{\infty}=500 \mathrm{~K}\) and an average heat transfer coefficient \(\bar{h}=50 \mathrm{~W} / \mathrm{m}^{2} \cdot \mathrm{K}\).Assuming the filament surface is opaque and diffuse, and it has a spectral emissivity as shown below: (25 pts)The oven walls...
The heat question and would like to have work solution. The
answers are (c) 136.6 (d) < 2%. thank you.
An long cylindrical vaccuum chamber shown in Figure 1, is used to anneal single titanium rods by maintaining their temperature at 800 °C for an extended period of time. Heat is introduced into the rods internally by induction. The insulation surrounding the chamber has a thicknesss of 50 mm and thermal conductivity of 0.1 W/m.K. The convective heat transfer coefficient...
Problem 4. (15 pts) The cylindrical pressure vessel is made of an aluminum alloy [E 7° GPa; and a shear modulus of G-26.1 GPa]. The cylinder has an inside diameter of 625 mm and a wall thickness of 10 mm. Two strain gages are mounted on the exterior surface of the cylinder at right angles to each other; however the angle θ is not known. The strains measured by the two gages are ε.-640 με and 6-1160 με. a) Determine...
Problem 2 A 4 mm diameter and 20 cm long aluminum fin (k 240 W/m-K) is attached to a surface. If the heat transfer coefficient is 12 W/m2 K, determine the percent error in the rate of heat transfer from the fin when the infiniely long fin assumption is used nstead of the adiabatic fin tip assumption. D-4 mm L- 10 cm Fig. 2 fin
2 ICED WATER IN A SPHERICAL CONTAINER (10 POINTS) Troom = 30°C Iced water O , D; = 5 m 1.5 cm T = 0°C A 5-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k = 15 W/( m K )) is used to store iced water at 0°C. The tank is located in a room whose temperature is 30°C. The walls of the room are also at 30°C. Heat transfer between the outer surface of the tank and the...
The roof of a refrigerated truck compartment consists of a layer of foamed urethane insulation (t2 = 62 mm, ki = 0.026 W/m K) between aluminum alloy panels (t1 = 6 mm, kp = 180 W/m K). The length of the roof is L = 9 m. The net solar radiation into the roof is 131 W/m2. The temperature of the inner surface is Ts,i = -3 °C and the air temperature is T. = 30 °C. The convective heat...
k=300
BRO p=2800 kg are m3 Aluminum Heat sinks of rectangular profile (k = 290 W m-K c = 900 kg-K commonly used to remove heat from a surface whose temperature is Ts = 150°C. The temperature of the surrounding air is 20°C. The natural heat transfer coefficient associated with the surrounding air is h = 200 m2-K Determine the temperature distribution along a fin. W Alr Toogh 20 mm 3 5 150°C 90 mm Assumption: Steady State, Two-Dimensional Conduction...