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CE3.4 Exam: Chemical & Process Engineering - Particles and Fluids (Spring 2005), Exams of Thermofluid Systems

English and Foreign Languages UniversityThermofluid Systems

A past exam paper from the ce3.4 module of the bachelor of engineering (honours) in chemical & process engineering program at cork institute of technology. The exam covers topics such as flow regimes, broad crested weirs, filtration, and centrifugal pumps. It includes multiple-choice questions, calculations, and problem-solving tasks.

Typology: Exams

2012/2013

Uploaded on 03/27/2013

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Cork Institute of Technology
Bachelor of Engineering (Honours) in Chemical & Process Engineering –
Stage 3
(Bachelor of Engineering in Chemical and Process Engineering – Stage 3)
(NFQ – Level 8)
Spring 2005
CE3.4 Particles and Fluids
(Time: 3 Hours)
Instructions
Answer FOUR questions.
Use separate answer books for each Section.
All questions carry equal marks.
Examiners: Mr. P. Kennedy
Dr. S. M. Raissian
Prof. R. Ocone
Mr. D. O Connor
Section A
Q1. Identify the flow regime for low-pressure air-water mixtures flowing vertically in a tube of
12.5 mm diameter under the following conditions.
Water flow rate
kg/s
Air flow rate
g/s
0.8 5
0.04 1
Take the densities of water and air as 1000 and 1.3 kg/m3 respectively. (14 Marks)
For bubble columns, the relationship between the drift flux and QG and QL the volumetric
flow rate of the gas and liquid respectively in the column. Is given by
n
t
L
G
GL u
S
Q
S
Q
u)1()1(
αα
α
α
−=−−=
For a particular bubble column, if ut = 0.5 m/s and n = 2, determine α for each of the
following conditions:
i) sm
S
Q
sm
S
QL
G/05.0/05.0 ==
ii) sm
S
Q
sm
S
QL
G/05.0/05.0 −== (11 Marks)
pf3
pf4

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Download CE3.4 Exam: Chemical & Process Engineering - Particles and Fluids (Spring 2005) and more Exams Thermofluid Systems in PDF only on Docsity!

Cork Institute of Technology

Bachelor of Engineering (Honours) in Chemical & Process Engineering –

Stage 3

(Bachelor of Engineering in Chemical and Process Engineering – Stage 3)

(NFQ – Level 8)

Spring 2005

CE3.4 Particles and Fluids

(Time: 3 Hours)

Instructions Answer FOUR questions. Use separate answer books for each Section. All questions carry equal marks.

Examiners: Mr. P. Kennedy Dr. S. M. Raissian Prof. R. Ocone Mr. D. O Connor

Section A

Q1. Identify the flow regime for low-pressure air-water mixtures flowing vertically in a tube of 12.5 mm diameter under the following conditions.

Water flow rate kg/s

Air flow rate g/s 0.8 5 0.04 1

Take the densities of water and air as 1000 and 1.3 kg/m^3 respectively. (14 Marks)

For bubble columns, the relationship between the drift flux and QG and Q (^) L the volumetric flow rate of the gas and liquid respectively in the column. Is given by

GL G L ut^ n S

Q S u = Q ( 1 −α )− α= α( 1 − α)

For a particular bubble column, if u (^) t = 0.5 m/s and n = 2, determine α for each of the following conditions:

i) QS^ G^ =^0.^05 m / s QSL =^0.^05 m / s

ii) QS^ G^ =^0.^05 m / s QSL =−^0.^05 m / s (11 Marks)

  1. (a) Describe and sketch a broad crested weir and (^) write an expression for the volumetric flowrate through it in terms of the width of the weir and the height of liquid above it. What are the basic assumptions made when deriving this expression? (15 Marks) (b) Water flows at a depth of 1.2 m in a rectangular channel, 2.7 m wide. A drop in level of 150 mm is observed, above a smooth hump of height 200 mm. Calculate the flow rate in the Channel. ( Marks)
  2. A product is to be filtered on a filter of area 40 m^2 for the first time. In previous campaigns the filter cake has been found to have a compressibility of 2.5 x 10 10 m/kg and the resistance of the medium has been evaluated as 1.52 x 10 12 m-1^. The amount of dry product per m^3 of filtrate is 1750 kg. Estimate the time taken to filter 30 m^3 of filtrate using the pump curve supplied. You may assume that the physical properties of the slurry are the same as those of Water at 30 o^ C. (25 Marks)
  3. Discuss the hazards involved in the operation of a Filtration Centrifuge under the following headings. Mechanical hazards (15 Marks) Fire and Explosion hazards (5 Marks) Toxic Hazards (5 Marks)
  4. A liquid stream of 150m^3 /hr and of concentration 100 kg/m^3 of solids must be concentrated to 750 kg/m^3 in a clarifier. Various settling tests were performed with the following results: U m/hr CF kg/m^3 0.70 200 0.40 238 0.31 270 0.23 320 0.17 400

Estimate the minimum diameter of the clarifier. (15 Marks)