If equation(2-1) was multiplied by dx,dy and dz,respectively and then addedtogether,we can writeHydrostatic pressure p is the function of coordinates,i.e. p=p(x,y,z),the totaldifferentiation of which is.When the two equations above were merged together,eq...[繼續(xù)閱讀]

    1. The concept of equipressure surfaceEquipressure surface is a surface comprised of the points,at which the pressureequals. For example,the interface between liquid and gas and the interface between twoliquids at equilibrium are equipressure surface.On e...[繼續(xù)閱讀]

    1. Three expressions for the basic equations of hydrostaticsA stationary fluid,for which the mass force only includes gravity,was consideredas the object of study. In a rectangular coordinate system,the z axis is verticallyupward as shown in Fig. 2-5. The...[繼續(xù)閱讀]

    1. The representation of pressureThe pressure can be calculated from different reference plane. Thus,there aredifferent expression ways such as: absolute pressure,relative pressure and vacuumdegree.Absolute pressure is zero-referenced against a perfect va...[繼續(xù)閱讀]

    As shown in Fig. 2-14,the liquid makes a uniformly accelerated rectilinear motionalong with the container. The central point of the original liquid surface is designated asthe origin. z axis is vertically upward and the included angle between the accelera...[繼續(xù)閱讀]

    In the case of a upright cylindrical container filled with liquid rotating at theuniform angular speed ω as shown in Fig. 2-15,liquid close to the wall of the containerrotates with the container at the beginning,and subsequently all liquid rotates with th...[繼續(xù)閱讀]

    As shown in Fig. 2-16,MN is a projection of an inclined plane at an angle θ with thehorizontal plane. The area of the compressed face in the horizontal plane is A.Atmospheric pressure is exerted on the surface of water. The intersection between theextende...[繼續(xù)閱讀]

    Graphic method is more suitable for the calculation of total hydrostatic pressure andacting point on the specification plane (for example,rectangle). Pressure distributiongraph need be plotted in order to calculate the total hydrostatic pressure.1. Hydros...[繼續(xù)閱讀]

    The projection plane of the curved surface MN on the vertical plane is M′N′. Thearea of the projection plane is Ax. The liquid M′N′NM was taken as a detached body.The equilibrium of forces acting on the detached body was analyzed as shown in Fig.2-23b. Th...[繼續(xù)閱讀]

    The vertical component on the curved surface can be calculated on the basis of thevolume of the liquid (called pressure prism) surrounded by the curved surface MN,theprojection plane M0N0 of MN on the free surface and the vertical plane at the edge of the...[繼續(xù)閱讀]