Air at 15 m/s is cooled from 80 C to 60 C in 2.5cm diameter tube. The tube wall is maintained at a constant temperature of 20 C. Air properties at 80 C are Pr= 0.581, dynamic viscosity 3.57 x 10^5 Kg- /m•s,thermal conductivity = 0.06 W/m-C, cp=1.5KJ/Kg-C and density = 1.5 Kg/ m^3.Calculate the length of the cylinder in m.

Air at 15 m/s is cooled from 80 C to 60 C in 2.5cm diameter tube. The tube wall is maintained at a constant temperature of 20 C. Air properties at 80 C are Pr= 0.581, dynamic viscosity 3.57 x 10^5 Kg- /m•s,thermal conductivity = 0.06 W/m-C, cp=1.5KJ/Kg-C and density = 1.5 Kg/ m^3.Calculate the length of the cylinder in m.

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

Air at atmospheric pressure enters a heating duct with dimensions of 3 x 6 in. The air enters the 16 ft long duct with a temperature of 32 F, and the duct surface is maintained at 150 F. If the air exit temperature is to be 68 F, what is the air flow, in lb/hr? (answer in whole number) For air, R = 53.342 ft-lbf/lbm-R, k = 0.173 Btu-in/ft2-hr-F, and cp = 0.24 Btu/lbm-
Topic: Heat transfer Completely solve and box the final answer. 6. Water flows at 5m/s is passed through a tube of 2.5 cm diameter, it is found to be heated from 20degC to 60degC. The heating is achieved by condensing steam on the surface of the tube and subsequently the surface temperature of the tube is maintained at 90degC. Water properties are as follows: density=995kg/m3, kinematic viscosity=.657x10-6 m2/s, Pr=4.43, k=.628W/mK, cp=4178J/kgK. What is the heat absorbed by the water?
Air at atmospheric pressure enters a heating duct with dimensions of 3 x 6 in. The air enters the 16 ft long duct with a temperature of 32 fahrenheit, and the duct surface is maintained at 150 fahrenheit. If the air exit temperature is to be 68 fahrenheit, what is the air flow, in lb/hr? (answer in whole number) For air, R = 53.342 ft-lbf/lbm-R, k = 0.173 Btu-in/ft2-hr-F, and cp = 0.24 Btu/lbm-
Topic: Heat transfer Completely solve and box the final answer. A 20degC water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40deg C. The water flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, What is the local heat flux (Q/A) at the end of the plate (k=0.72 W/m deg C, Re=3840000, and Pr=0.7)?
200 pm 0.12 cm Fluid Stationary cylinder 4 In regions far from the entrance, fluid flow through a circular pipe is one-dimensional, and the velocity profile for laminar flow is given by u(r) = Umax(1 - r/R9), where R is radius of the pipe, r is the radial distance from the center of the pipe, and Umax is the maximum flow velocity, which occurs at the center. Obtain (a) a relation for the drag force applied by the fluid on a section of the pipe length L and (b) the value of the drag force for water flow at 20°C with R = 0.08 m, L = 15 m, Umax = 3 m/s, and u = 0.0010 kg/m.s. %3D
Air is flowing naturally over a cylinder of D=(15) cm. Air has thermal conductivity 0.027W/mK, kinematic viscosity 1.9*10-5 m2/s, Rayleigh number 108, and Prandtl number0.72. Find the Nusselt number
Topic: Heat transfer Completely solve and box the final answer. 5. Water flows at 5m/s is passed through a tube of 2.5 cm diameter, it is found to be heated from 20degC to 60degC. The heating is achieved by condensing steam on the surface of the tube and subsequently the surface temperature of the tube is maintained at 90degC. Water properties are as follows: density=995kg/m3, kinematic viscosity=.657x10-6 m2/s, Pr=4.43, k=.628W/mK, cp=4178J/kgK. Find the thermal coefficient.
The difference in pressure (in N/m²) across an air bubble of diameter 0.001 m immersed in vater (surface tension = 0.072 N/m): P
The velocity distribution in a 25 m long and 40-cm diameter pipe is v(r) = 2*(1-25r²) where the velocity units are m/s and radius is in m. Determine the following: (a) What is the drag force (i.e shear force) on the wall for water with an absolute (i.e., dynamic viscosity) of 0.0010 kg/m-s? (b) What is the shear stress at a distance of 5 cm from the centerline of the pipe? R-0 R r=0
Calculate the height of capillary rise in a glass capillary tube having a radius of 3.5 x10-5 m. The surface tension of water is assumed to be 72.7 mN/m. (g = 9.81 m/s²) 10 .a 0.423 m 302 m 423 m 0.21 m b .C .d
PROB E. A capillary –tube viscometer is being selected to measure viscosity of a liquid food. The maximum viscosity to be measured will be 230 cP and the maximum mass rate is 900 grams per hour. If the tube length is 10 cm and the maximum sustainable pressure is 25 Pa, determine the nominal diameter size of the tube to be used.
Example: Water has a coefficient of viscosity of 0.001 Pa/s. What pressure difference is necessary to keep water moving with a volume flow rate of 0.015m³/s through a 3 m long pipe with a radius of 2 cm. What do you understand under the answer?