atw - International Journal for Nuclear Power | 01.2020

atw Vol. 65 (2020) | Issue 1 ı January
| Fig. 2.
Grid sensitivity analysis.
(a) XY coordinates
| Fig. 3.
A partial view of the final grid.
3 Results and analyses
| Fig. 4.
Comparison of numerical results and experimental data.
(b) ZX coordinates
(a) f with respect to Re
(13)
(b) j with respect to Re
The valid range of the Reynolds
number for Eqs.(14) and (15) is from
5 to 50.
Comparison of numerical results
and experimental data is shown as
Figure 4(a) and (b). It is found that
the RNG k-ε model is more suitable
than laminar model in CPSHE. The
related difference of numerical results
of RNG k-ε model and experimental
data is within 15%. It is verified that
the results of simulation is reliable
during Re range from 5 to 50.
RESEARCH AND INNOVATION 31
3.1 Evaluation factors
The friction factor ƒ and Colburn
factor j are respectively considered as
evaluation factors of flow resistance
and heat transfer. JF factor is used to
evaluate the comprehensive performance
[11-13]. And ƒ, j and JF factors
are respectively defined as:
(9)
(10)
(11)
Where L is the length of the channel,
Nu is the Nusselt number, Pr is the
Prandtl number, μ o is the viscosity of
oil at the average temperature of oil,
μ w is the viscosity of oil at the average
temperature of the wall.
The valid range of the Reynolds
number for Eqs.(12) and (13) is from
5 to 50.
Numerical results with varying
inlet flow rate are collected and
analyzed. The criterion equation for
heat transfer and characteristic
equation for flow resistance in the
form of fanning friction coefficient are
obtained for the circular corrugated
plate, given as:
(14)
(15)
3.3 Corrugation angle
3.3.1 Bulk flow patterns
Figure 5(a)-(c) display the bulk flow
patterns for water with 15°≤β≤75°,
u = 0.35 m/s and Re = 30. When
β