Abstract
Much literature is known related to a single pipe junction and a manifold for a long time. Nevertheless. as cross-sectional area ratios of branch to main pipe and branch spacings are kept constant in a large majority of much literature, the relations between the loss coefficients and those factors are not clarified when the values of those factors are varied respectively. However, in order to design the uniform lateral outflow from a perforated conduit or a slot, it is necessary to consider the area ratios and branch spacings and so forth which are supposed to be important for the design. Therefore, as the first step the following is tried to make the fundamental data on the uniform outflow from a perforated conduit or a slot; that is, the characteristics of the outflow from an orifice is analyzed by using the momentum theorem, and some factors are adopted. According to the results of experiments, it becomes clear that the analyzed values coincide comparatively well with the experimental ones in the case of a single perforated pipe.
