mtech-presentationfeb19
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NUMERICAL SIMULATION OF COMBINED CONVECTION
AND RADIATION HEAT TRANSFER FROM TUBE BANK
MED812 : Major Project Part 2
SHARAD PACHPUTESHARAD PACHPUTESHARAD PACHPUTESHARAD PACHPUTE
(2009MET2431)Mid-semester evaluation
2nd semester 2010-2011
20 February 2011
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1.Objectives and Deliverables
1.1 Objectives
To carry out numerical study on flow past a single cylinder and tubebanks at different parameters.
To understand fluid flow and heat transfer characteristics considering
radiative participating gases
To obtain heat transfer correlations
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1.2 Deliverables at the end of the project Numerical simulation of tube bank at different parameters
Overall summation of result for cylinder and tube bank
Developed correlation for single cylinder and tube bank
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2 .Project plan and progress
Sr.No.
Work elementsMonth
Jun July Aug Sept Oct Nov Dec Jan Feb Mar April May
1 solving CFD tutorial and learning of ICEMCFD
2 Literature Review
3Flow past single cylinder considering
radiative participating media4 Development of grid model for tube bank
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5Heat transfer from tube bank considering
radiative participating media
6Post processing of simulated models for tube
bank
7 Thesis writing
completed
work to be done
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3. RESULT
3.1 Laminar flow- convective heat transfer from single cylinder
Authors
Convective Num
at Re=100
Convective
Num at Re=500
Mc Admas (analytical) 5.23 -
Kramers (analytical) 5.49 -
Eskert et.al (experimental) - -
Zhukaus correlation 5.18 10.778 -
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. . . .
Present value (numerical) 5.1685 12.165
Case-I: Tw >Tin Case-II: Tin > Tw
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Re T NuconvNucomb
1=1
2=10
3=30
4=60
Re=100
T1 5.1685 12.134 8. - -
T2 - - - - -
T3 - - - - -
Re=300
T1 9.1386 16.75 12.901 - -
T2 - - - - -
T3 - - - - -
Case-I: (Tw >Tin) Tin=800k Tw=850,900,1000k , T1 =50K , T2=100 K, T3=200K ,
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Re=500
1 . . . . .
T2 12.205 20.702 17.151 - -
T3 12.285 22.356 17.675 - -
Case-II: (Tin > Tw ) Tw =800k Ti=850,900,1000k , T1 =50K , T2=100 K, T3=200K
Re T NuconvCombined Nusselt number (Nucomb )
1 =1 2 =10 3 =30 4 =60
Re=500
T1 12.180 19.75 16.0157 - -
T2 12.203 20.47 16.985 - -
T3 12.287 22.456 17.675 - -
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3.2 Turbulent flow over cylinder: Unsteady SST K- model, Tin=800k Tw =850k,Pr=0.7
ReTu
%
Circumferentially and time averaged Nuconv (Nux,t)% difference
from
experiment
al
Present
numerical
value
K. Szczepanik
et. al
( numerical)
Experimental
value of
Scholton et.al.
Zhaukaus
Correlatio
n
7190 1.6 67.22 67.3 (steady K-) 49.5 42.1 35.79%
21580 0.46 112.97 148 (unsteady k-) 103.4 92.2 9.22 %
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50350 0.36 177.5 191.1 (steady K-, T-lim) 155.1 146.165 14.41%
Fig.3.2.Temprature contours a)Re=7190 b)Re=21580 ,b) Re=50350
a) b) c)
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3.3 Tube bank flow : convective heat transfer
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Zhukauskas correlation for both staggered and aligned arrangement for number of row
Fig3.3,Temprature contours for tube bank flow Fig3.4,Velocity contours for tube bank flow
20LN
0.25
0.36
,maxPrRe Pr Pr
m
D D
s
Nu C =
max
,maxReV D
D
=Where C, m depends on
2 0L
N ( )max
T
D
SV V
S D=
If
220 20
L L
D DN N
Nu C Nu
= Where C2=0.9 for NL=4
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3.5 Comparison between convective and combined Nu for tube bank
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Fig.3.5. AW Convective Nu for row-1 Fig.3.6. AW Combined Nu for row-1
Re T
Nuconv Combined Nucomb1 =1
Present
value
Zhukauskas
Correlation
Re=500 T1 8.96104 9.171 14.547
Tube bank flow- inline arrangement: Tin >Tw Tw=800k Ti=850 , Pr=0.7
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4.Projections until work completion
4.1 Major tasks:
Numerical simulation of tube bank simulation at different geometrical models
4.2 Major difficulties: Numerical simulation of combined convective and radiative heat transfer take
more time
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4.3 Need for time beyond 15 May 2011:
No time needed for completion of project beyond 15 May
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