atw 2018-04v6

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atw Vol. 63 (2018) | Issue 4 ı April

range 5×10 5 ≤ Re ≤ 6×10 5 and overestimates

for 3×10 5 ≤ Re ≤ 4×10 5

and deviations are between 0.54 and

6.66 percent depending on inlet Re

and P/D.

5.6 Pressure drop

While nanofluid enhances the convective

heat transfer, the fluid itself

P/D = 1.25

Inlet Re Increment of h (%)

φ = 0.5 % φ = 1.5 % φ = 3.0 %

6×10 5 2.75 9.62 22.46

5.098×10 5 2.75 9.58 22.37

4×10 5 2.72 9.51 22.16

3×10 5 2.74 9.42 21.89

| | Tab. 5.

Heat transfer increment (%) for different nanofluid coolants.

also gets heavier compared to pure

water. Hence, it is of utmost importance

to determine the amount of

pressure drop for the effective application

of nanofluid coolant in nuclear

reactors since it is directly related to

the pumping power required. In this

study, pressure drop along the center

line of the subchannel is evaluated for

different coolants and results are presented

in Figure 16 (a) & (b). Percentage

of pressure drop increment is

documented in Table 6.

The results shows that pressure

drop is significantly increased with

the augmentation of particle volume

concentration which in turn increases

the pumping power. For nanofluid

P/D = 1.55

Inlet Re Increment of h (%)

φ = 0.5 % φ = 1.5 % φ = 3.0 %

6×10 5 2.72 9.56 22.35

5.098×10 5 2.72 9.51 22.26

4×10 5 2.71 9.44 22.01

3×10 5 2.69 9.40 21.87

RESEARCH AND INNOVATION 255

(a) P/D = 1.25

| | Fig. 15.

Comparison of numerical Nu against different correlations.

(b) P/D = 1.35

(a) P/D = 1.25

| | Fig. 16.

Comparison of pressure drop for different coolant.

(b) P/D = 1.35

P/D = 1.25

Inlet Re Increment of ∆p (%)

φ = 0.5 % φ = 1.5 % φ = 3.0 %

6×10 5 6.22 21.53 56.60

5.098×10 5 5.82 21.17 56.62

4×10 5 5.79 21.79 56.02

3×10 5 5.24 21.65 55.83

P/D = 1.35

Inlet Re Increment of ∆p (%)

φ = 0.5 % φ = 1.5 % φ = 3.0 %

6×10 5 5.82 20.94 56.37

5.098×10 5 5.74 21.29 56.08

4×10 5 5.46 20.90 55.10

3×10 5 5.62 20.88 55.82

| | Tab. 6.

Pressure drop increment (%) for different nanofluid coolants.

Research and Innovation

Nanofluid Applied Thermo-hydro dynamic Performance Analysis of Square Array Subchannel Under PWR Condition ı Jubair Ahmed Shamim and Kune Yull Suh

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