Estimate the amount of heat removed, Physics

Assignment Help:

A cooling drum consists of a (horizontally) rotating, large stainless steel cylinder. The cylinder has a diameter D and a width of W. The cooling at the inside of the drum is so effective that the outside temperature is homogeneous and constant at T °C.

This drum is used to produce a foil of X mm thick (and Y m wide) out of a polymer mixture. The mixture is distributed over the whole width onto the drum and removed as a foil after half a revolution. The mixture is at a temperature of T1 °C and has a density of M kg/m3, a heat capacity of H J / kg K and a heat conductivity of Q W / m K.

Using a rotation frequency of K Hz, the foil is cooled down sufficiently for further processing. The surroundings are at T2 °C.

Consider melting heat to be incorporated in the specific heat given

Assume that the polymer layer is flat and horizontal

The highest temperature in the foil at removal is a prerequisite.

a. Make a schematic drawing of the process

b. Make a complete list of relevant physical quantities (symbol, dimension, description)

c. Calculate the production rate of foil (kg/s and linear metre per second)

d. Determine the temperature profile in the foil at the moment of removal.

e. Estimate the amount of heat removed by the cooling water and via the top surface to the surroundings. What do you conclude?

Now the production is to be doubled and one considers the following possibilities:

1. Double rotation frequency

2. Double thickness of foil

3. Double external drum diameter

4. Double drum width

f. What are the consequences of each measure (apart) for the process (in terms of production rate, critical temperature and other process variables). Use the method of scaling factors.

g. How would you advise to scale up the process? (in the same terms)


Related Discussions:- Estimate the amount of heat removed

Visualize the effects of moving sources, Draw a picture of a moving source ...

Draw a picture of a moving source and the waves surrounding it according to what you observed in this experiment. How does the spacing of the wave-fronts in front of the source com

New potential difference, A parallel plate capacitor has plates of area 200...

A parallel plate capacitor has plates of area 200 cm 2 and separation among the plates 1.00 mm. What potential difference will be manufactured if the charge of 1 nC is given to th

Adding 3 vectors, Adding 3 Vectors A simple demonstration of adding 3 v...

Adding 3 Vectors A simple demonstration of adding 3 vectors graphically. Also elaborates in which vector addition is relative.

Longitudinal waves and tuning forks, Longitudinal Waves and Tuning Forks ...

Longitudinal Waves and Tuning Forks Sound waves are generates through vibrating objects. Whether it is the sound of a person's voice, the sound of a piano and the sound of a tr

Explain snell''s law, Snell's Law: The ratio of sine of angle of incide...

Snell's Law: The ratio of sine of angle of incidence to the sine of angle of refraction is constant for all rays passing from one medium to another medium. That is Sini/Sinr

What are the applications of nmr spectroscopy, Q. What are the applications...

Q. What are the applications of nmr spectroscopy? Answer:- The major applications of NMR stereoscopy are the elucidation of the carbon-hydrogen backbone of organic compoun

Low of succeve disintigration, Dirive an expretion for low of succecive dis...

Dirive an expretion for low of succecive disintigretion

Moving the bar magnet rapidly away from the loop, Question: A wire loop...

Question: A wire loop smears in a horizontal plane. Alongside the loop is a vertical bar magnet south end up. The bar magnet is divide by the plane of the loop. A person is shi

Extrapolate the experimental data to predict the pressure, Water at 20°C fl...

Water at 20°C flows through a long, straight pipe. The pressure drop is measured along a section of the pipe of length 1.3 m as a function of average velocity through the pipe. Res

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd