Estimate the amount of heat removed, Physics

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)

Posted Date: 2/21/2013 2:52:02 AM | Location : United States







Related Discussions:- Estimate the amount of heat removed, Assignment Help, Ask Question on Estimate the amount of heat removed, Get Answer, Expert's Help, Estimate the amount of heat removed Discussions

Write discussion on Estimate the amount of heat removed
Your posts are moderated
Related Questions
State the law of radioactive decay. Show that radioactive decay is exponential in nature. Does the activity of a radioactive element depend on external physical conditions? La

Are optical fiber fraglle? Glass fibers are very brittle, actually in any glass light guide there is a percentage of fibers broken throughout the manufacturing process, conver

AC Input Resistance in Common Base Configuration Ratio of change in emitter base  voltage  (?V EB )  to  the  resulting  change  in  emitter  current  (?I E )  is  called in

a) Thomson's heat is proportional to the current passing by the conductor. b) This effect is produced when parts of similar conductor are kept at dissimilar temperature. c) I


Because of concentration difference holes or electron try to vary from their side to other side. Only these holes or electrons cross the junction, having high kinetic energy. This

An electron, an alpha-particle and a proton have the similar kinetic energy. Which one of these particles has the main de-Broglie wavelength?

Cross Product The direction of the cross product of 2 vectors is elaborates. The magnitude shown is correct but not discussed.

When a pulse is reflected from a free side, then there is no changing of medium. Crest (C) represents as crest (C) and trough (T) denotes as trough (T), Time changes by zero and

explain and give examples of the two types of current