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Fig. 9


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sidewall rib structure (a) triangular, rectangular and semi-circular sidewall ribs [39] (b) Triangular, rectangular and trapezoidal sidewall ribs [40] (c) Hydrofoil-shaped sidewall ribs [42] (d) Aligned and offset fan-shaped sidewall ribs [43] (e) Semicircular and semi-elliptical sidewall ribs with or without fillet [46].

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