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
Q. What are coherent sources? Two sources are alleged to be coherent if they emit light waves of the same wave length and start with same phase or have a constant phase differ

What are the applications of Heterojunction Laser? Applications of Heterojunction laser: a. Into consumer electronics, semiconductor lasers are utilized in VCD/CD /DVD playe

What do you mean by a shunt? Reduce expressions for the current flowing through the shunt resistance and galvanometer. Describe the principle on which a transformer works. Defin

Get an expression for work done during reversible isothermal expansion. Get the terms open, isolated and closed system. Give examples.

Truck and The Ball Suppose a pickup truck moving along with a constant speed along a city street. Within the course of its motion, a ball is projected straight upwards through

What is the difference among dynamic strain aging and strain aging? Strain aging could be explained as " tear and normal wear " or the fatigue that is experienced under normal

(a) Equation (3) may be viewed as a formalism of synaptic plasticity - the synapse is able to change in strength in response to either use or disuse of it. We can observe the s


what is magnitisam?how north pole and south pole takes part in it?

What is a Temperature Scales? Fahrenheit, Celsius and Kelvin were scientists who studied how heat and temperature work. The most familiar scale to Americans (until the time tha