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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

iitd )HE 0DMRU3URMHFW3DUW0LGVHP

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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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