On the Experimental Result Concerning the Energy Loss at the Branching and Joining Parts of a Ventilating Trunk

Abstract

The present report relates to the results obtained in an experiment concerning the energy loss in branching and joining flows of various ventilating trunks for ships. In the experiment, fifteen different kinds of trunks were used. By the experiment the effects of changes in the wind velocity, of the flow ratio, of the area ratio and branching shapes have been elucidated. At the same time, the reason for the improvement or deterioration of the performances of several kinds of the trunks with various branching mechanisms has been definitely traced through the observation of water-flow models. As a result of the experiments, it has been made clear that the trunk of type A (a rectangular branching) indicates a far superior performance than any of the trunks tested, while, on the other hand, that the trunk of type E (an inflected branching) has the most inferior performance.