In percolation under the negative pressure, there are two kinds of flow: ― (1) the saturated percolation being kept maintained under the negative pressure in porous media, and (2) the saturated percolation changing with the course of time into the unsaturated. In this study that makes clear the changing process of the latter flow in the various gases dissolved in the percolation liquid, the changing degree of both liquid saturation and unsaturated liquid intrinstic permeability in the pores in porous medium, were quantitatively analyzed. The present paper is divided into two parts; 1 and 2. The first containing chapter I to IV, and the second from V to VII. Chapter I explained the clue for the motive for this study. In chapter II, there were considered differential forms of Darcy's Law and f undamental equation of percolating flow, the previous study herein reviewed again. In chapter III, in case of the saturated percolation being kept, under the negative pressure in porous media in downward percolation through the layered porous media, the flow was analyzed experimentally and theoretically. Generally, in the percolation under the negative pressure like this, it was clearly shown that, though the potential gradient is great, Darcy's Law still holds good, and that, regardless with the pressure, positive, or negative, the saturated percolating flow is possible to be treated. In chapter IV, the two types of percolation — downward through layered porous media, and inclined through layered media — were experimented. In the percolation under the negative pressure, both the unsaturationizing process with the course of time in the pores in porous media, and the pressure distribution in the same circumstances, were experimentally analyzed. With its characteristic, some favorite results were obtained. The release of gas from the percolating liquid in the pores of porous media, was concluded to cause the pores to be unsaturationized. In chapter V, there has been tried a quantitative determination relating to a process in which liquid unsaturation in pores proceeds and a decrease of liquid permeability caused together with that as time elapses. As the principal cause in case air bubbles are released to the pores in a porous medium, there is, under the condition of constant temperature, observed a change of air solubility due to the difference between the initial pressure of supplied water and the pressure of fluids in the porous medium. In order to simplify the analysis of percolation, a porous medium was set in a siphon tube so that the experiments were carried out under the condition that a constant pressure was caused in the fluids contained in the medium. The results of calculation and experiment appear to agree considerably well. In chapter VI, the research was more generalized: the quantitative analysis was made under the condition of the temperature and the pressure respectively changing in the percolating liquid. According to the changing pressure, the critical temperature varied. Above the critical temperature, the pores went on being unsaturationized; the present experiment corresponded well to the theory. Below that, however, air-bubbles were absorbed and dissolved in the pores; between the theory and experiment a discrepancy came out of this phenomenon, a consideration was given. In the experiment of this study, water was used as percolating liquid; sand particle and glassball as porous medium.
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