Book excerpt: Excerpt from Hydraulic Research in the United States Detailed study of flow processes in bends with main emphasis on guide vane bends. Two dimensional and secondary effects are to be separated so that the performance of a given bend geometry can be predicted. It has been shown that secondary flows have only a small influence upon the two-dimension al deflection in a guide vane bend, but increase the two-dimensional loss many fold. The relation of the secondary flow to the increased loss has been shown and formulas which check the experimental data reasonably well have been deduced. A result of practical im portance is that a guide vane system of minimum loss can be obtained using thin plate vanes by selecting a two-dimensional cascade of such vanes having a small head-loss cc efficient and using vanes of large chord length. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.