WindowBookmarksHelpry100%s3.us-east-1.amazonaws.comCourse Contenthttps://s3.us-east-1.amazonaws.com/blackboard. learn.xythos.prod/585304 babb2ec/5421499?response-content-dis2- Sections of the trans-Alaska pipeline run above the ground and arevertical steel shafts (k = 25 W/m.K) that are 1 marea of 0.005 m2. Under normal operating conditions, the temperature variationalong the length of the shaft is known to be governed by an expression of the formsupported bylong and have a cross-sectionalT 100 150 X+ 10 X2Where, T and x have units of °C and meters, respectively. Temperature variationsare small over the shaft cross section. Evaluate the temperature and conductionheat rate at the shaft ground interface (X 1 m). Explain the difference in heatrate at the two ends of the shaft.

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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

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Determine the total length of a wrought iron pipe (e = 0.000046) with a diameter of 1.5 in which will result in a pressure drop of 70 kPa due to fluid friction, for fluids flowing at a rate of 0.2 kg / s, a viscosity of 2 cP, and a density of 1000 kg / m3 (use a moody diagram ) a. Reynold number = Answer3. b. Friction factor (f) = Answer. c. Pipe length = Answerm.
A settling tank for municipal water supply is 2.5 m deep,and 20°C water fl ows through continuously at 35 cm/s.Estimate the minimum length of the tank that will ensurethat all sediment (SG = 2.55) will fall to the bottom forparticle diameters greater than (a) 1 mm and (b) 100 μm.
The flow rate of water in a garden hose is measured using the bucket-andstopwatch method. Filling a 5-L bucket takes 75 seconds. If the inner diameter of the hose is 10 mm and the density and viscosity of water are approximately 998 kg m-3 and 0.9 cP, respectively, (a) is the flow inside the hose laminar or turbulent? (b) If the flow rate is adjusted such that the flow is with Re = 2100, how long would it take to fill the same bucket?
In Tinyland, houses are less than a foot high! The rainfallis laminar! The drainpipe in Fig. P6.21 is only 2 mmin diameter. (a) When the gutter is full, what is the rateof draining? (b) The gutter is designed for a sudden rainstormof up to 5 mm per hour. For this condition, what isthe maximum roof area that can be drained successfully?(c) What is Red?
Make an analysis of the shape h ( x ) of the water–air interfacenear a plane wall, as in Fig. , assuming that theslope is small, R - 1 ≈ d 2 η / dx 2 . Also assume that the pressuredifference across the interface is balanced by thespecifi c weight and the interface height, ∆p ≈ ρ g η . Theboundary conditions are a wetting contact angle θ at x = 0and a horizontal surface η = 0 as x--->∞. What is themaximum height h at the wall?
choose the correct answer Q1- Water flows in a pipe of (150)mm diameter at a velocity of (5.5) m/sec with dynamic viscosity (1.12*10^-3) pa.sec and 1000 m3/kg density), the flow is : * a) Laminar b) Turbulent c) Transition d) Rotational e)none of all above
The present pumping rate of crude oil through the AlaskaPipeline, with an ID of 48 in, is 550,000 barrels per day(1 barrel = 42 U.S. gallons). (a) Is this a turbulent flow?(b) What would be the maximum rate if the flow wereconstrained to be laminar? Assume that Alaskan oil fitsFig. A.1 at 60°C.
QUESTION 22.1. A water hammer is a phenomenon caused by the sudden increase or decreasein fluid velocity which results in pressure fluctuations in a pipe.A common cause of the water hammer is rapid closure of a valve in apipeline. In order to minimise the pressure rise, the closure time of thevalve needs to be increased. If a pipe (K = 18.9 x 105 kPa) is laid for adistance of 1500 m, which of the following would be considered a gradualvalve closure time?(a) 1.3 seconds(b) 5 seconds(c) 2.18 seconds(d) All of the above 2.2. hich of the following is considered a minor friction loss in pipe system?(a) Slight changes in elevation(b) Shock losses due to a pipe contraction(c) Head loss due to pipe friction(d) Head loss when the fluid passes through a valve.
Determine the pressure drop over a reducer with the following conditions: Fluid density: 25 kg/m3Fluid velocity: 1.5 m/sFluid viscosity: 0.001 Pa*sInlet diameter: 0.12 mOutlet diameter: 0.019 mPipe absolute roughness: 4e-4 m Give your final answer in Pa, rounded to the nearest whole number. [Ignore entrance/exit losses and velocity loss terms]
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For the flow of gas between two parallel plates of Fig. 1.7,reanalyze for the case of slip fl ow at both walls. Use thesimple slip condition, δu wall = l ( du/dy ) wall , where l isthe mean free path of the fl uid. Sketch the expected velocityprofile and find an expression for the shear stress ateach wall.
1. Most bridges contain interlocking steel grates (α steel = 1.2 x 10 - 5 ºC -1 ) that allow the bridge toexpand and contract with the changes in temperature. The Golden Gate Bridge in San Francisco isabout 1350 meters long.(A) The seasonal temperature variation in San Francisco ranges from about 0ºC to 30ºC. Howmuch will the bridge expand between these two extremes?(B) What percent of the length of a subcompact automobile, 2.5 meters, does this gaprepresent?2. Selena has a fire in her fireplace to warm her 20ºC apartment. She realizes that she hasaccidentally left the iron poker (α iron = 1.2 x 10 -5 ºC -1 ) in the fire. How hot is the fire if the 0.60-meter poker lengthens 0.30 cm?3. Just before midnight, when the air temperature of 10.0ºC, Karl stops and fills the 0.0600 m 3 gastank in his car. At noon the next day, when the temperature has risen to 32ºC, Karl finds a puddle ofgasoline (βgas = 3 x 10 -4 ºC -1 ) beneath his car.(A) How much gasoline spilled out of Karl's car?…

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