CH2104 Heat & Mass Transfer
James Kwan
Lecture 8
So far we have been learning the heat equation
H
T
+ V T = 2 T + v
t
C p
Then usually we simplify and get
2 T +
Hv
=0( 1D)
C p
1-D/2-D
There are 3 co
CH2104 Heat & Mass Transfer
James Kwan
Lecture 7
Last Lecture
So far we keep making assumptions or ideal situations. In reality, it is impossible to achieve. More
assumptions made, less accurate. So w
CH2104 Heat & Mass Transfer
James Kwan
Last Lecture
Flux q=k
T
x
Heat rateQ=q A=kA
U (Conductance)=
T
=U (T )
L
kA 1
=
L R
Heat transfer across a plane (1 Dimensional Conduction)
Non dimensionalisatio
CH2104 Heat & Mass Transfer
James Kwan
Lecture 11
What have been covered so far
H
T
+ V T = 2 T + v
t
C p
With different combination, such as 1D or 2D, steady or unsteady state, with heat generation
CH2104 Heat & Mass Transfer
James Kwan
Lecture 10
We will be doing transient system in 2-dimensional conduction.
We have a fin in the computer chips, where there is a side with T H and the rest is the
CH2104 Heat & Mass Transfer
James Kwan
Lecture 8
Last Lecture
There is this Peltier device
The bottom is very hot, there are a lot of plates arranged such that between plates there is a layer of air
T
CH2104 Heat & Mass Transfer
James Kwan
There are equations that come out in the tutorial.
Lecture 13
2
1. x 2
y
y ( 2 2 2)
+x
+ x + n y=0(Cylindrical Bessel Function)
2
x
x
2. x 2
2 y
y
+2x
+ ( 2 x
CH2104 Heat & Mass Transfer
James Kwan
Lecture 6
q=k ( n T )
That equation is from the textbook because we know the heat flow through the surface.
So it becomes
q=k T
For the boundary outside the two
CH2104 Heat & Mass Transfer
Last Lecture
James Kwan
Lecture 12
We talk about flow in external and internal and also the heat transfer (convection and conduction)
We also talk about Prandtl Number and
CH2104 Heat & Mass Transfer
James Kwan
Lecture 14
What we have discussing internal and external convection of the flow inside and outside the pipe.
We talk about the Reynolds Prandtl and Nusselt Numbe
Problems for Tutorial 1
1. If the molar Gibbs free energy of component A is 10 KJ/mol and that of component B is 5
KJ/mol, plot the molar Gibbs free energy of the mixture as a function of composition
CH 3102 - CHEMICAL REACTION ENGINEERING (2018)
Tutorial 1 Chemical Reactions and Batch Reactors
Grading: Please hand up answers to Question 1 and Question 2 by Monday (29 Jan 2018)
1:30pm to CBE GO (N
CH 3102 - CHEMICAL REACTION ENGINEERING (2018)
Tutorial 2
Grading: No need to hand up this Tutorial assignment as we shall have Quiz 1 next week.
1. At 523K, A(g) decomposes to B(g) and C(g). A (g) B
Problems for Tutorial 3
1. Experimental vapor pressure data for component A is given below:
T (K)
290
300
310
320
330
340
350
VP - Experimental (bar)
0.0859
0.1380
0.2137
0.3203
0.4662
0.6611
0.9157
C
Problems for Tutorial 4
1. The liquid phase activity coefficients of the Water (W) Acetic acid (A) system are given as follows:
log W x A2 BA C A 4 xW 1 C A xW x A 6 xW 1
log A xW2 BA C A 4 xW 3 C A x
Problems for Tutorial 6
1. A mixture of npentane and nhexane, at 30 C, is fed to a distillation column (operating under 1 atm. pressure)
at the rate of 2500 lbmol/hr. The fed contains 40 mol% of n pen
CH 3102 - CHEMICAL REACTION ENGINEERING (2018)
Tutorial 3 (Single reaction Flow reactors)
Grading: Please hand up answers to Question 1 by Monday 1:30pm (12 Feb 2018) to
CBE GO (level B3). You are req
Problems for Tutorial 5
1. Antoines parameters for Benzene and Toluene are as follows (for vapor pressure in mm of Hg and T in C):
Component
Benzene
Toluene
A
6.9057
6.9546
B
1211.033
1344.800
C
220.7
Problems for Tutorial 2
1. A 150 liters/sec vapor feed, at 120 C and 1 atm. pressure, containing 50% butane and 50% hexane (by
mole), is compressed to 1.1 atm. pressure and is cooled to 57 C. The resu
CH 3102 - CHEMICAL REACTION ENGINEERING (2018)
Tutorial 4 Single Reaction (Multiple Flow Reactors and Autocatalytic Reactions)
1.
We wish to explore various reactor setups for the following autocataly
Q.1 A liquid-phase isothermal reaction takes place in a continuous stirred-tank reactor.
The reaction is first-order where A is reacted to form B. We assume that the vessel has
a constant volume, oper
Quiz.-
CHM-[Il- Process control 82 nya-m'ies
October 20' [5 Duraf-im: 60 nunutes
MatricNo Maxim-urn marks: 100 Q] (i) For the liquid level system shown in Figure, the resistance R1 is linear and R2 is
Quiz
CH3101~ Process Central & Dynamics
amanLS
October .2016 Duration: 60 minutas
Name.
Matric No. Maximum. marks: 100 Q.1. A tank having a time constant of 1 min and a resistance of 1/ 18 /cfm (c
Quiz
CH3101- Process Control & Dynamics
October 2017
Duration: 60 minutes
Name. _
Matric No. _
Maximum marks: 100
NOTE:
1. You are allowed to use your textbook and lecture notes during the test. No
ot