A silicon wafer of diameter D120 mm, and emissivity of 0.6 is at an initial temperature of Ti 325oC and is allowed to cool in quiescent, ambient air and large surroundings for which Tair Tsur 350C. What is the rate of cooling from the upper surface of the wafer? Properties of Air: k- 0.0373 W/m.C. v32.39*10-6 m2/s, alpha 47.210-6 m2s Pr 0.686. B- 1/Tf = 0.0022 K-1. Select one: O a. 344 W O b. 53 W O . 627 W O d. 86 W

A silicon wafer of diameter D120 mm, and emissivity of 0.6 is at an initial temperature of Ti 325oC and is allowed to cool in quiescent, ambient air and large surroundings for which Tair Tsur 350C. What is the rate of cooling from the upper surface of the wafer? Properties of Air: k- 0.0373 W/m.C. v32.39*10-6 m2/s, alpha 47.210-6 m2s Pr 0.686. B- 1/Tf = 0.0022 K-1. Select one: O a. 344 W O b. 53 W O . 627 W O d. 86 W

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

At the end of its manufacturing process, a silicon wafer of diameter d 258 mm , thickness & =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)? Silicon :p= 2330 kg/m, c = 813 J/kg· K, k = 87.8 W/m· K. %3D -6 2 Air: v = 32.15x10° m /s, k = 0.0372 W/m K, a = 46.8 ×10 m /s, Pr 0.686 Quiescent air T Tsur Silicon wafer D, 8, e, T
mecha
PROBLEM: IVD-19 BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUD
an insulated steam pipe located where the ambient temperature is 32c has an inside diameter of 50mm with 10 mm thick. the outside diameter of the corrugate asbestos insulation is 125 mm and the surface coefficient of still air, ho= 12 w/(m-k). inside the pipe is steam having a temperature of 150c withnfilm coefficient hi = 6000w/(m-k). thermal conductivity of pipe and asbestos are 45 and 0.12 w/(m-k) respectively, determine the heat loss per unit length
In order to determine the latent cooling load produced, estimate the rate at which water is evaporated from an indoor swimming pool. The pool area is maintained at 24 C dry bulb and 17 C wet bulb while the pool water has a temperature of 27 C. The pool has dimensions of 100 × 50 m. Assume (i) a unity Lewis number and (ii) a natural convection condition between the pool water and air of 8.5 W/(m2-C)
Heat transfer
A vertical cylinder 1.5m height and 18 cm in diameter is maintained at 100° C in an atmosphere environment of 20˚ C. Calculate the heat loss by free convection from the surface of the cylinder. Use the following data: p=1.06 kg/m³ v= 18.97x106 m²/s, k-0.1042 W/mK and Pr=0.6975 Nu =0.1 (Ra)¹/3
Assume the Fourier number, Fo, is greater than or equal to 0.2 (note that you still need to calculate the Biot number, and possibly a second Biot number).
= A long rod of 60-mm diameter and thermophysical properties p 8000 kg/m³, c C = 500 J/kg-K, and k = 50 W/m-K is initially at a uniform temperature and is heated in a forced convection furnace maintained at 750 K. The convection coefficient is estimated to be 1000 W/m².K. What is the centerline temperature of the rod when the surface temperature is 570 K? The centerline temperature of the rod is i K.
A silicon wafer of diameter D -120 mm, and emissivity of 0.6 is at an initial temperature of Ti- 325oC and is allowed to cool in quiescent, ambient air and large surroundings for which Tair Tsur 35oC. What is the rate of cooling from the upper surface of the wafer? Properties of Air: k0.0373 W/m.C.v- 32.3910-6 m2 alpha 47.2106 m2/s Pr 0.686. B= 1/Tf = 0.0022 K-1. Select one: O a. 344 W O b. 53 W O . 627 W O d. 86 W
Complete answer thank you
Q1 (a) Differentiate between free and forced convection with examples. (b) Define Nusselt (Nu), Prandtl (Pr), Reynolds (Re) and Grashof (Gr) dimensionless numbers. State which numbers are used in free and forced convection to determine the heat transfer coefficient. (c) A vertical pipe 90 mm diameter and 2.5 m height is maintained at a constant temperature of 125 °C, The pipe is surrounded by still atmospheric air at 25 °C. Find heat loss by natural convection. Properties of water at 75 °C: Density = 1.0145 kg/m³ Kinematic viscosity = 20.55 x10-6 m²/s Prandtl number (Pr) = 0.693 Thermal conductivity (k) = 30.06 x 10-3 W/m K g × ß x L³ × AT Grashof number, Gr = V² Nu = 0.10(GrPr)0.333