Energy Losses Due to Division and Combination of Flow at 90° Wyes

Abstract

The loss coefficients and the power-loss coefficients for a smooth symmetrical 90° wye with diameter ratio of unity were determined experimentally for each of all configurations of flow through the wye. Empirical equations for loss coefficients and those for power-loss coefficients were presented for each configuration of flow. The experiments were also carried out for a screwed symmetrical 90° wye which was manufactured according to the specification of the Japanese Industrial Standards. It was shown that the loss coefficients and the power-Ioss coefficients are markedly different from those for the smooth symmetrical 90° wye, and that they arc much affected by the axial length of the internal threads exposed to the flowing fluid. The loss coefficients for dead end wyes, in which the dead end was formed by closing the valve in the downstream, were also given.