Steam used to sterilize fermentation equipment is piped 20 m from a factory boiler room through a 6-cm-diameter tube. The surface temperature of the steam pipe is roughly constant at 118°C. Most of the length of the tube lies unprotected and exposed to the outside weather. The air temperature is 5°C and the wind speed is 7.5 m/s. The properties of air at 330 K are: Cp=1007 J/kg°C, kfb=0.0283 W/m°C, ρ=1.076 kg/m3, and µb=1.99∙10-5 kg/m∙s.
Estimate rate of heat loss from the pipe in kW
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List the basic principles of the distillation tower at
least 4 principal
and why there are several design techniques?
please my friends I need the answer in obvious script.
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A piston-cylinder device initially contains 0.20(kg) of steam at 3.5(MPa), 300(C). The steam loses heat to the surroundings and the piston moves down, hitting a set of stops at which point the cylinder contains saturated liquid water. The cooling continues until the cylinder contains water at 220C.
A) Sketch the above process on a P-v chart, indicating values
B) Determine the pressureand qualityof the final mixture.
C) Determine the boundary work (in kJ)
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1) A gas mixture containing 75% air, 20% of A and 5% of B (by
volume) is in equilibrium
with an aqueous solution of A and B at a temperature such that the
saturation pressure
of pure A is 3 bar, and that of pure B is 8 bar. Estimate the
composition of the liquid if
the total pressure is 2 bar. State any assumptions you have
made.
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Drug delivery systems are often ‘pelletized’ as spheres. Construct the control volume. Determine the continuity equation and the steady-state, spherical flow rate of medicine. Model the drug as an incompressible fluid.
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Why must a power cycle release heat at some point
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|
Gaseous ammonia can be injected into the exhaust stream of a
coal-burning power plant to reduce the pollutant NONO to N2N2
according to the following reaction: |
Part A What should be the flow rate of ammonia delivered at 765 torrtorr and 298 KK into the stream to react completely with the NONO if the ammonia is 65.0% pure (by volume)? |
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Air is cooled from 300 K to 273 K as it flows steadily through a duct. Frictional dissipation may be neglected. Cooling is achieved by removing heat via a heat pump. The work requirement is 1.15 times that of a reversible heat pump operating between 263 and 310 K. For each mole of air flowing through the duct, calculate: Air can be assumed an ideal gas with a constant heat capacity cP of 3.50R. The temperature of the surroundings is 300 K
a) Total irreversibility in J/mole
b) Irreversibility due to heat transfer between air and the heat pump
c) Irreversibility due to heat transfer between the heat pump and the surroundings
d) Internal irreversibility of the heat pump
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Q1.The results of a batch settlement analysis carried out on a mixed suspension are given in the following Table 1.
Plot the cumulative velocity profile of the suspended solids and compute the predicted removal rate by settlement.
| Number | Sample depth(m) | Sample time(h) | SS in sample (mg/l) |
| 1,2,3 | 1,2,3 | 0 | 222(averaged) |
| 4 | 1 | 1 | 140 |
| 5 | 1 | 3 | 108 |
| 6 | 1 | 6 | 80 |
| 7 | 2 | 1 | 142 |
| 8 | 2 | 3 | 110 |
| 9 | 2 | 6 | 106 |
| 10 | 3 | 1 | 142 |
| 11 | 3 | 3 | 130 |
| 12 | 3 | 6 | 124 |
| 13 | 4 | 1 | 147 |
| 14 | 4 | 3 | 126 |
| 15 | 4 | 6 | 114 |
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a laboratory-scale stirred tank fermenter of volume 51 (do/h=1/2) is to be scaled up to 500l by using the following criteria: di/do=1/3, n=100rev/min. determine the size of the fermenter impeller diameter and speed for each case:
a. constant oxygen transfer rate
b. constant power/volume
c. constant impeller tip speed
d. constant mixing time
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Consider the electrochemical cell described below: What is the cell potential (Ecell) for the voltaic cell described below if the.
Ag(s) çAg2CrO4 (Sat. Aq. Soln) çç Ag+ (0.125 M) ç
Ag(s)
a. What is the concentration of [Ag+] in the anode of the cell
described above, if the Ksp of
Silver (I) chromate is 1.1 x 10-12 ?
b. What is the Ecell?
c. Draw an overall cell diagram for this cell. Remember to label the cathode, anode, and electron flow.
please answer all
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Problem 1: You have a particle system that you produced for your research work. Now you are not sure what size of particles it will be. Which particle size analyzer/technique you will use and why? Give the fundamentals of how the analyzer/technique works.
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1. a) Determine the molar solubility of Cu(OH)2.
THE ANSWER IS: 1.77X10^-7M
b) Write the balanced reactions, overall reaction, and determine the equilibrium constant upon dissolving Cu(OH)2 in a strong acid. (4 pts)
I cant seem to write the reaction of the strong acid
c) Is Cu(OH)2 more soluble or less soluble in acid? Prove it! Determine the solubility of Cu(OH)2 in a solution of HCl at pH = 4.0. Show all work. (You may assume x is small). (4 pts)
I did part a. However, cant seem to figure out the equation for
part b and because of that I cant do my ICE table for part c. Any
help would be appreciated :)
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Superheated steam enters a turbine at 3 MPa, 550oC, and exits at
0.01 MPa.
a) If the process is reversible adiabatic (isentropic), find the
final
temperature (T2s), the final enthalpy (h2s) of the steam, and the
turbine
work (Wt,s).
b) What is Sgen for the above process?
c) If the isentropic efficiency is 90%, find the actual final
temperature (T2a)
and calculate Sgen?
d) Plot process (a) and (c) on a Ts diagram.
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what is the Palmgren-Miner rule used for? briefly please
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