RT Journal Article ID 36d134ad5dc86283 A1 Wei, Jieli A1 Zhang, Jingyu A1 He, Xiaomin A1 Jin, Yi A1 Li, Ji A1 Zheng, Mei T1 EFFECTIVENESS OF IMPINGING-FILM COOLING FOR DIFFERENT INDUCTING SLABS JF Heat Transfer Research JO HTR YR 2019 FD 2019-07-24 VO 50 IS 13 SP 1285 OP 1305 K1 impinging-film cooling K1 cooling effectiveness K1 film cooling AB In this paper, the effects of the impinging-film cooling effectiveness η for different inducting slabs are investigated experimentally and numerically. The cross section of an inducting slab (Rec or Tri), the layout of the cooling scheme (f-type and t-type) and an inducting channel (convergent, uniform, and divergent) were considered. The mainstream temperature was 403 K; and that of the coolant was ambient (298 K). The density flow ratio (DFR) ranging from 2.30 to 9.70 was considered. The cooling effectiveness η was obtained from experiment, while a numerical solution gave the detailed flow characteristics. The results show that the cooling effectiveness η increases with a raise in DFR. Triangular cross-sectional inducting slab (Tri) shows larger cooling effectiveness η as well as lower turbulence intensity than that of rectangular one (Rec) in an f-type layout. The comparison of the different cooling layouts shows that under the same conditions, the f-type layout presents better cooling performance than that of the t-type one. For inducting channel alteration, a uniform one gives better cooling performance in the initial section of the film with streamwise location x/d < 18, whereas a convergent one performs best after x/d = 18. PB Begell House LK https://www.dl.begellhouse.com/journals/46784ef93dddff27,3e928f7d07354f73,36d134ad5dc86283.html