This is the second of a series of papers on the characteristics of fluid flow through two orifices in series. The first paper (l) presented a theoretical analysis of the flow of water and steam through two orifices in series over a wide range of pressures and temperatures. This paper presents the results of experimental investigations on this subject using water at an initial pressure of 100 psia and over a range of temperatures from room temperature to saturation temperature. The principal data sought were the pressures established in the intermediate chamber between the two orifices, and especially the variations of this intermediate pressure with reference to the temperature of water supplied and the type of orifice. One of the most significant facts revealed by these researches is that under certain conditions of flow the fluid assumes a metastable state which greatly influences the characteristics of the process. Finally, a device responsive to the pressure variations obtained between two orifices in series constitutes a control element, useful, among other things, to control flow in response to the state of the fluid supplied.

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