A flow network is a system of mutually intersecting holes ApT, Apn in a plate or an assembly of plates. The flow at each intersection is characterized by a collision of two flow streams, resulting in com-Q, Q' plex flow patterns through the downstream holes. In the case of multiple intersections, the flow is periodically disrupted at each succeeding intersection, thus preventing the formation of a fully-de-R veloped flow through the holes, s An experimental study is presented in this paper to determine T, T, flow characteristics in flow networks with various geometry. The intersecting pressure loss coefficient which represents the perfor-V manee of flow networks is defined and its magnitude empirically W determined as functions of geometric and flow conditions. A method is developed to measure the ramming loss in an intersection tube. fl Flow visualization by means of hydrogen bubble method is applied /~ to observe flow patterns and mixing behavior in the flow network, v 0 A physical model is developed to predict the intersection pressure loss in flow networks. 0 pressure drops in the flow network and its half unit, respectively flow rates passing through the test section equivalent to standard condition and in operating conditions, respectively universal gas constant test plate thickness air temperature in the plenum and the absolute temperature of air, respectively fluid flow velocity mass flow rate of air diameter ratio in the quadrant-edged orifice dynamic viscosity of fluid kinematic viscosity of fluid intersection angle between holes fluid density