School of Chemical Sciences and Engineering
CEIC2002 Chemical Engineering
Fundamentals 2
SESSION 2, 2009
Contents
General Course Information
Student Learning Outcomes
Assessment
Course Schedule
Resources for Students
Teaching Strategies
The rationale behi

677
Example 14.27: Dry air at 30C flows over a plate also at 30C with the plate surface constantly
covered with a water film. The velocity of flow is 6 m/s. The plate is 1 m long. Determine the
average convective mass transfer coefficient and also the mas

551
HEAT EXCHANGERS
the outer pipe is 62.5 mm. The outside may be considered as insulated. The properties of oil at
70C are: density = 858 kg/m3, kinematic viscosity v = 60 106 m/s. k = 0.140 W/mK, specific
heat = 2100 J/kg K. Determine the overall heat t

PHASE CHANGE PROCESSESBOILING, CONDENSATION FREEZING AND MELTING
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The total heat should pass through the solid layer and to the outside.
Tfr T
=
FG x IJ + FG 1 IJ
Hk K Hh K
s
T1 Tfr
(1/h1 )
+
s hsf . dx
.(11.41)
d
Defining four new variables
T* =
T1 T

632
FUNDAMENTALS OF HEAT AND MASS TRANSFER
Problem 13.21: The surface A1 and A2 (Fig. P.13.21 (a) having emissivities of 0.6 and 0.4 are
maintained at 800 K and 400 K.
(i) Determine the heat exchange between the surfaces per unit length considering these

602
FUNDAMENTALS OF HEAT AND MASS TRANSFER
For parallel rectangles (floor to ceiling, F14) the parameters
X = longer side/distance between planes = 2/1 = 2.0
Y = shorter side/distance between planes = 1.5/1 = 1.5
The corresponding value F14 = 0.36 (from c

650
FUNDAMENTALS OF HEAT AND MASS TRANSFER
(c) For a given gas body, the emissivity will decrease with increase in temperature.
(d) Snow has high emissivity.
13.15 Choose the correct statement or statements
(a) The shape factor of samll enclosed body with

PHASE CHANGE PROCESSESBOILING, CONDENSATION FREEZING AND MELTING
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Solution: The equation applicable is (11.47).
* = 0.5 r*2 ln r* +
FG 1 0.25IJ (r*
H 2R * K
2
1)
As freezing is to be done upto R = 24 mm,
24
= 1.5
16
R* = h.Ro/ks = 25 0.016/2.22 = 0.1

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W/m2 K. The gas flow rate is 1.33 times the air flow rate. Determine the area required for maintaining the same heat flow rate when cold air rate and inlet temperatures are maintained but
the gas flow rate is changed to (i) the same as air flow rate (

476
FUNDAMENTALS OF HEAT AND MASS TRANSFER
Solution: The property values evaluated at 50C are
Pr
k
air
17.95 106
0.698
28.26 103
1/323
oil
162 106
1960
0.14245
6.9 103
0.5675 10
3.68
0.63965
0.48 103
Water
Air:
Oil:
9.81 60 0.03 3
0.698 = 1.066 105
323 (

SCHOOL OF CHEMICAL SCIENCES & ENGINEERING
CEIC2002 Chemical Engineering Fundamentals 2
Lecture Summary - Week 2 (lecture 1)
Combined Conduction & Convection
in many applications the heat conducted through a body is removed at the surface of
the body by co

SCHOOL OF CHEMICAL SCIENCES & ENGINEERING
CEIC2002 Chemical Engineering Fundamentals 2
Lecture Summary - Week 2 (lecture 2)
Unsteady-State Conduction
consider a situation where the temperature of a solid body is initially at some
uniform temperature
if th

SCHOOL OF CHEMICAL SCIENCES & ENGINEERING
CEIC2002 Chemical Engineering Fundamentals 2
Lecture Summary - Week 1 (lecture 2)
Critical Radius of Insulation
consider a layer of insulation (ro) around a pipe (ri, Ti) which is exposed to a
convection environme

SCHOOL OF CHEMICAL SCIENCES & ENGINEERING
CEIC2002 Chemical Engineering Fundamentals 2
Lecture Summary - Week 1 (lecture 1)
Modes of Heat Transfer
heat transfer is concerned with the rate of energy transferred from a high T region to
a low T region
three

536
FUNDAMENTALS OF HEAT AND MASS TRANSFER
both inside and outside of tubes using the flow rates and once the configurations are finalised,
the area can be estimated. During operation, it may become necessary to heat water from
other than design temperatu