1 answer

I need help on number3 lelmperaturein the luid as a function of r, the distance from...

Question:

lelmperaturein the luid as a function of r, the distance from the descne t re? What are the boundary conditions? The thermal

i need help on number3

lelmperaturein the luid as a function of r, the distance from the descne t re? What are the boundary conditions? The thermal conductivity k of the fluid is considered center of the sphe constant. The temperature of the sphere constant at Ta boundary is constant at Tr. and the temperature far from the fluid is (b) Determine the temperature profile in the fluid. (c) From the temperature profile, obtain an expression for the heat flux at the surface. From this flux, deter mine the Nusselt number. (30 points) in a counter-current flow heat exchanger, the hot stream is cooled from 120 to 40°C while the cold strean temperature cha be the percent increase or decrease in heat transfer rate? nges from 30 to 60°C. If the same heat exchanger were operated with co-current flow, what would 3. (30 points) Let us consider an unsteady state heat conduction in a sphere of radius R. Initially the temperature distri bution within the sphere is uniform at To (T-T ). After time t = 0, the sphere surface temperature is changed t 0 (7-0). The thermal diffusivity of the sphere material is α. (a) What is the equation to find out the temperature distribution T(r,l) within the sphere? (b) What are the initial and boundary conditions? (c) The equation obtained in (a) is not easy to solve directly. So, put T(r,t)-Y(r,t)/r and derive a new equation on Y together with the boundary and initial conditions of (d) Solve the new equation to obtain T(r,t) 4. (40 points) Let us consider three parallel planes. The distance between two adjacent surfaces is 0.1m. Between t adjacent surfaces, air is filled. The bottom surface (S1) is maintained at 350K while the top surface (S3) is maintained at 300K. What is the temperature of the middle surface (S2)? Here all the surfaces are gray bodies of emissivity 0.5. Also assume that S2 is very thin and the conductivity of the material is very large so that the temperatures of the both sides of S2 are the same

Answers

2- / 20 3 0 2. 20 30 Concbon3 16.S

.

Similar Solved Questions

1 answer
Job order P-3A Case Inc. is a construction company specializing in custom patios. The pa st...
job order P-3A Case Inc. is a construction company specializing in custom patios. The pa st of goods constructed of concrete, brick, fiberglass, and lumber, depending upon customer p dule. eference. On June 1, 2017, the general ledger for Case Inc. contains the following data. Raw Materials Inventor...
1 answer
4. A student is taking a multiple-choice quiz where each question has four choices. The student...
4. A student is taking a multiple-choice quiz where each question has four choices. The student randomly guesses the answers to the five-question quiz. What is the probability that the student gets all of the questions correct? (TEKS G.13.E) 1 (В A 256 1024 - D 5 16...
1 answer
A purified protein has a molecular mass of 360 kDa when measured by size exclusion chromatography....
A purified protein has a molecular mass of 360 kDa when measured by size exclusion chromatography. When analyzed by gel electrophoresis in the presence of SDS, three bands are observed, with molecular masses of 160, 140, and 60 kDa. When gel electrophoresis is carried out in the presence of SDS and ...
1 answer
3. (4 points) Sound emerges through a doorway as shown in the figure. The width of...
3. (4 points) Sound emerges through a doorway as shown in the figure. The width of the doorway is 77 cm, and the speed of sound is 343 m/s. Find the diffraction angle when the frequency of the sound is (a) 5.0 kHz and (b) 5.0.102 Hz. 0 8 III - B=...
1 answer
The following data sets are annual growth rates for two products Calculate Statistics with Excel Y...
The following data sets are annual growth rates for two products Calculate Statistics with Excel Y 2013 2014 2015 2016 2017 2018 2019 2020 5.35% 6.25% 3.06% 12.05% 14.25% 5.25% -7.35% 9.50% 7.25% 4.35% 6.95% -13.50% -14.50% 18.00% 19.50% 2.00% 17 Calculate the geomtric average of X and Y a. X 6.05% ...
1 answer
Cash Payback Period, Net Present Value Method, and Analysis Elite Apparel Inc. is considering two investment projects. The estimated net cash flows from each project are as follows: Year Plant Expa...
Cash Payback Period, Net Present Value Method, and Analysis Elite Apparel Inc. is considering two investment projects. The estimated net cash flows from each project are as follows: Year Plant Expansion Retail Store Expansion 1 $113,000 $95,000 2 93,000 111,000 3 80,000 76,000 4 72,...
1 answer
Shrieves Casting Company is considering adding a new line to its product mix, and the company...
Shrieves Casting Company is considering adding a new line to its product mix, and the company hires you, a recently business school graduate, to conduct capital budgeting analysis. The production line would be set up in unused space in Shrieves' main plant. The machinery’s invoice price wo...
1 answer
An electron moving parallel to the x axis has an initial speed of 5.38 x 106...
An electron moving parallel to the x axis has an initial speed of 5.38 x 106 m/s at the origin. Its speed is reduced to 1.24 105 m/s at the point x = 2.00 cm (a) Calculate the electric potential difference between the origin and that point. Volts (b) Which point is at the higher potential? the point...
1 answer
One's intelligence quotient or IQ varies directly as a person's mental age and inversely as that...
One's intelligence quotient or IQ varies directly as a person's mental age and inversely as that person's chronological age. A person with a mental age of 15 and a chronological age of 25 has an IQ of 120. What is the chronological age of a person with a mental age of 20 and an IQ of 100...
1 answer
In Country A, the population mean height for 3-year-old boys is 39 inches. Suppose a random...
In Country A, the population mean height for 3-year-old boys is 39 inches. Suppose a random sample of 15 3-year-old boys from Country B showed a sample mean of 38.4 inches with a standard deviation of 4 inches. The boys were independently sampled. Assume that heights are Normally distributed in the ...
1 answer
The following are the sample data sets from your class project about waiting line theories: Arrival:...
The following are the sample data sets from your class project about waiting line theories: Arrival: 1, 3, 3, 3, 4 Service time: 33, 33, 52, 69, 58 The arrival data were number of cars arrived per every 5-minute interval, and the service data were the number of seconds spent on taking the correspond...
1 answer
Marshon Lattimore Industries purchased a machine to be used in their business operations at a cost...
Marshon Lattimore Industries purchased a machine to be used in their business operations at a cost of $1,385,000. Lattimore took out a loan which will require them to pay $50,000 in interest expense over the life of the loan. Additional costs incurred are: sales tax amounting to $40,000; transportat...
1 answer
A solid brass sphere, an aluminum hoop, and a solid stainless steel cylinder are each allowed...
A solid brass sphere, an aluminum hoop, and a solid stainless steel cylinder are each allowed to roll down the entire length of a one-meter long plank that is inclined at an angle of 30 degrees to the horizontal. The density of brass is 8.50.1g/cmº), the density of aluminum is 2.60 [g/cm3), and...
1 answer
A emmanuelcol Netflix Google youtube emmanuel college mi Which Of The Following is An A Question...
A emmanuelcol Netflix Google youtube emmanuel college mi Which Of The Following is An A Question 21 Which of the following is an acidic oxide? O P4010 OMgO O Fe₂O3 o Kzo Cr₂O3...