Optimization of heat and fluid flow over curved trapezoidal winglet pair type vortex generators with one-row and three-row
[ X ]
Tarih
2023
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Passive heat transfer enhancement methods are frequently chosen to achieve higher thermo-hydraulic performances in engi-neering applications because they do not require external energy. One of the most popular passive methods for increasing heat transfer and improving the cooling effects of heat transfer surfaces is the use of vortex generators (VGs). However, the pressure drop generated by the usage of VGs must be controlled. This work is interested in the number (one, three) and geo-metric dimensions of VGs in the rectangular channel. Numerical optimization studies are carried out for heat and fluid flow over curved trapezoidal winglet pair (CTWP) type VGs for one-row and three-row to obtain optimum geometric dimensions of one-row and three-row of CTWP types VGs in the rectangular channel under incompressible and turbulent flow and con-jugate heat transfer assumptions. Heat transfer and pressure drop values are compared in terms of j/j(0) (the ratio of Colburn factor with CTWP to without it) and f/f0 (the ratio of friction factor with CTWP to without it), respectively. The optimiza-tion problems are solved with no constraints in the workflows. Multi-Objective Genetic Algorithm (MOGA) is used for the computations where the maximization of j/j0 and minimization of f /f0 are the two objective functions. Thermo-hydraulic performances ( R = (j/j(0))/(f/f(0))) of the studied cases are also compared. The optimization variables are inclination angle (alpha), attack angle (beta), width / length ratio (b / a), height of the VG (h), interval between VG pair's front edges ( S1 ) for both one-row and three-row cases, also longitudinal spacing between each VG pair (SL) is added as an optimization variable for three-row case. It is found that three-row of CTWP type VGs can increase j/j(0) also increase f/f0, i.e., heat transfer enhance-ment is obtained with a pressure drop increment disadvantage and it is possible to achieve 24.05% heat transfer enhancement with the penalty of 17.27% pressure drop increment as compared to one-row of CTWP type VGs. Furthermore, the fact that the pressure drop has the maximum value does not mean that the heat transfer value is the maximum.
Açıklama
Anahtar Kelimeler
Numerical-Simulation, Tube Bank, Plane, Performances, Channel
Kaynak
Heat and Mass Transfer
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
59
Sayı
8
