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Figure 4


Fig. 4. The log-transformed local Sherwood number (Shx) and local Reynolds number (Rex) at the upstream and downstream locations of Vallisneria spiralis and Vallisneria americana in a flat and twisted configuration determined from the mass transfer coefficient (Shx=kcxD–1; where kc=0.1u*Sc–0.67) calculated using the shear velocity (u*) measured using PIV measurements. The thin dotted line indicates the theoretical turbulent Shx, and the thick dotted line indicates the theoretical laminar Shx, based on Eqn 7, Eqn 9, and the 1/7 power-law (White, 1998). Symbols are as in Fig. 2.





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