At the end of its manufacturing process, a silicon wafer of diameter d = 258 mm , thickness ô =1 mm is at an initial temperature of 325 C and is allowed to cool in quiescent, ambient air and large surroundings for which T =T= 25 C, What is the initial rate of cooling by convection (kJ/s) from the TOP surface ONLY (Watts)? 3 Silicon :p= 2330 kg/m , c = 813 J/kg · K, k= 87.8 W/m·K" 2 -6 Air: v = 32.15×10 m /s, k = 0.0372 W/m K, a = 46.8 ×10° m/s, Pr= 0.686 %3D Quiescent air T Tsur Silicon wafer D, 8, e, T

At the end of its manufacturing process, a silicon wafer of diameter d = 258 mm , thickness ô =1 mm is at an initial temperature of 325 C and is allowed to cool in quiescent, ambient air and large surroundings for which T =T= 25 C, What is the initial rate of cooling by convection (kJ/s) from the TOP surface ONLY (Watts)? 3 Silicon :p= 2330 kg/m , c = 813 J/kg · K, k= 87.8 W/m·K" 2 -6 Air: v = 32.15×10 m /s, k = 0.0372 W/m K, a = 46.8 ×10° m/s, Pr= 0.686 %3D Quiescent air T Tsur Silicon wafer D, 8, e, T

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

John is employed by a new food processing plant where eggs are to be boiled in large quantities to produce egg salad. John has been assigned the task of determining the minimum cooking time for the eggs, utilizing his vast knowledge of heat transfer. As a basis of calculation, he assumed that the eggs are perfect spheres with a diameter of 5 cm and uniform material properties (r =1000kg/m'; Cp = 3300 J/(kg K) and k=0.75 W/(m-K)). The eggs were taken from a cold storage room at 5°C and immediately put into pots of boiling water at 100°C. The convective heat transfer coefficient of the water is h = 1500 W/m°K. For health safety reasons, the plant requires that the entire egg must be at a temperature above 75°C for at least 20 seconds in order for the cooking process to be complete. a. What is the minimum time necessary to cook the egg to company specifications? b. In the testing lab, John forgot to remove a batch of eggs, and they remained in the cooking pot long enough to reach a…
(Heat Transfer) A furnace wall is composed of 20.32cm of fireclay brick (k=1.32 W/m^2.k), 10.16cm mineral wool (k=0.039 W/m^2.k), and 10.16cm of common brick (k=0.69 W/m^2.k). The surface temperature of the common brick is 60°C and the interface temperature between the common brick and the mineral wool is 30°C. The temperature of the gases is 1000°C and the temperature of the outside air is 30°C. Determine the outside air coefficient hc=W/m^2.k
A glass manometer with oil as the working fluid is connected to an air duct as shown in the figure. I) Will the oil levels in the manometer be as in a or b? II) What is the response if flow direction changes? III) If the manometer is replaced with a piezometer at a smaller cross section, oil levels will be according to a or b? Flow Flow (a) (h) O a. I) a; II) a; III) b O b. I) b; II) b; III) a O c. I) a; II) b; III) b O d. 1) b; II) a; III) a
1 The temperature of the outer surface of the container T5,0 2 The temperature of the inside surface of the container Ts,i 3 The temperature at the center of the waste sphere (r = 0) °℃ °℃ °℃
14- A south wall group D at (32 oN, Kw = 0.65). The room temperature is (24 oC). The maximum outside temperature is (42 oC). The daily range is (12 oC). Its heat transfer coefficient is (1.2 W/m2.oC) and dimensions are (5 x 3 m) with door of dimensions of (1.5 x 2 m). At (17 PM) in August, its Cooling load is Select one: a. 361.7 W b. None of these c. 261.7 W d. 303 W
Normal forces (F1, F2, and F3) are uniformly applied across the faces of a rectangular polycrystalline block of material, as shown in the attached photo. The dimensions of the block are S1 = 5 cm, S2 = 12 cm, and S3 = 4 cm. Calculate the normal engineering strain in the X2 direction due to the resulting elastic deformation. Use the following if needed: E = 250 GPa, ν = 0.35, μ = 56 GPa, F1 = 50 kN, F2 = 10 kN, and F3 = 5 kN.
8.
14- A south wall group D at (32 oN, Kw = 0.65). The room temperature is (24 oC). The maximum outside temperature is (42 oC). The daily range is (12 oC). Its heat transfer coefficient is (1.2 W/m2.0C) and dimensions are (5 x 3 m) with door of dimensions of (1.5 x 2 m). At (17 PM) in August, its Cooling load is Select one: Q2 a. 361.7 W b. None of these c. 261.7 W d. 303 W
A piece of beef steak 5 cm thick will be frozen in the freezer room -25 ° C. This product has a moisture content of 73%, a density of 970 kg / m, and a thermal conductivity (frozen) of 1.1 W / (m K). Estimate the freezing time. using the Plank equation. This product has an initial freezing temperature of -1.75 ° C, and the movement of air in the freezing room gives a convective heat transfer coefficient of 10 W / (m² K). tf =
A food product wants to be produced in a small round shape (pellet) by freezing it in a water blast freezer freezer. Air freezer operates at -25 ° C. The initial product temperature is 25 ° C. The pellet has a diameter of 0.5 cm, and a density of 980 kg / m3. The initial freezing temperature is -2.5 ° C. The latent heat of freezing of the product is 280 kJ / kg. The thermal conductivity of the frozen product is 1.9 W / (m ° C). The convective heat transfer coefficient is 50 W / (m? K). Calculate the freeze time.