What is transient heat transfer? why it is important?

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Q) For the short to medium- term (10 to 50 years). State a minimum of five realistic steps (not subsidies) that can be implemented to achieve a sustainable energy solution for the world.

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Q) For the short to medium- term (10 to 50 years). State a minimum of five realistic steps (not subsidies) that can be implemented to achieve a sustainable energy solution for the world.

An interesting flow results from superposition of a point source with strength m located at the origin and a uniform flow of strength U. Find the complex potential for this flow combination and graph the streamlines. Then, find the stagnation points and find the streamfunction at the stagnation point.

A refrigerant (R-134 A) at 0.8 MPa and 30 deg Celcius is throttled in a steady flow to a lower pressure and a temperature of -10 deg Celcius. What is the specific entropy generated? You can make the usual assumptions that are made for a throttle.

An oil cooler is in the form of a single shell 4 tube heat exchanger in which oil passes through the tubes and cool water passes through the shell. Water comes in at 15C and leaves at 25C and has a mass flow rate of 20 kg/min. Oil enters at 35C with a mass flow rate of 30 kg/min. C_p of oil is 2.13 kJ/KgC and that of water is 4.18 kJ/kgC. If the surface area of the heat exchanger is 0.5 m², calculate the overall heat transfer coefficient. Assume the heat exchanger is adiabatic with regards to the surroundings.

how can i redesign a simple bench vise inorder to decraese the total assembly time in solid works

The cantilever is affixed to the free end of a square cross-section piezoelectric (PZT) block, which is fixed at the other end. Draw the schematic of the lumped-parameter model of the cantilever-PZT system, obtain the mathematical model of this mechanical system, and derive the lumped mass and stiffness of the PZT knowing that la = 0.01 m (length of PZT block), a = 0.005 m (side length of PZT cross-section), EPZT = 55 GPa (Young’s modulus), ?PZT = 7500 kg/m3 (mass density). The piezoelectric material losses are represented by an equivalent viscous damping coefficient cPZT = 60 N-s/m.

Compare how Griffith determined critical crack length, ac, with how the value of r*is determined in the solidification process.

Water at 50 °F is being transported from one open reservoir to another open reservoir using a concrete pipe. The two reservoirs are 1.5 miles apart with a difference in surface elevations of 25 ft. Determine the minimum pipe diameter needed to carry 10 ft3 /s of water.

(Chapter 15)

Q: Please give an example of creep.

3.0 kg of air initially occupying a volume of 0.01 m3 at a pressure of 95.0 bar expands in a piston-cylinder assembly isothermally and without irreversibilities until the volume is 0.05 m3. Using the Redlich-Kwong equation of state, determine the

1. temperature during the process, in K

2. final pressure, in bar

Materials are subject to changes from temperature. We know there are several states of matter: solid, liquid, gas, and plasma. However, within a solid-state, materials have their properties affected, in particular brittleness. The Liberty ships of the Second World War were often breaking from cold weather.

These failures highlighted a material fracture problem.

What causes these failures, what materials are affected, and are there any that are not? How is brittleness calculated and measured (types of measurement) and what does this means for aircraft material selection and design considerations? You may include the influence of this problem from a maintenance perspective.

Your report of a minimum of 2,000 words is due for this assignment.

A spherical motile bacteria with a radius of 1.0 microns and a density approximately equal to water is swimming in water (temperature 20 C) at a speed of 8.0 microns per second. The bacteria suddenly stops swimming. Since the Reynolds number for a swimming bacteria is small, it should experience Stokes drag (F?_D? = 6????Rv).

(a) How long (in seconds) does it take the bacteria to come to a “complete” stop? We’ll define a “complete” stop to be when the speed has dropped to 25.0 nanometers per second.

(b) How far (in meters) does the bacteria coast in this time?

This is problem 6-19 from El-Wakil’s Powerplant Technology book -- a 35,000 lb_m/h double-effect evaporator receives motive steam at 40 psia and 300°F. Pretreated raw water enters at 60°F. The pressure in the second effect is 5 psia. Calculate, for equal heat heads, (a) the amount of motive steam required, in pound mass per hour, and (b) the surface areas for each evaporator, in square feet.