Due to the flow mechanisms tripped by present wavy sidewalls,
which appear compatible with the rib-induced HTE flow mechanics,
the present NuIL=Nu1 range is considerably raised about
21–71% from the single-pass comparative group shown by
Fig. 6(a). While present NuTR=Nu1 are significantly elevated from
present inlet-leg and outlet-leg counterparts, the NuOL=Nu1 ratios
are consistently higher than the NuIL=Nu1 ratios at all Re tested,
Fig. 6(a)–(c). Clearly, the remaining swirls immediate downstream
present sharp bend in the outlet leg generate the higher degrees of
HTE benefits than those emerged at the entry region of inlet leg at
present abrupt entry condition. Above all, the NuA=Nu1 ratios over
the entire endwall for each of present two-pass test channels are
considerably raised about 42–72% from the comparative two-pass
channels with various rib configurations collected in Fig. 6(d).