Dynamic pressure increment

The dynamic pressure increment, Ap at a certain depth is the difference between the hydrostatic and the hydrodynamic pressure-depth relation at that depth (T6th, 1978). T6th (1978) showed that the dynamic pressure increment is a function of both ground surface elevation and depth of measurement. He proposed the use of a two-dimensional presentation of this relation (the elevation-depth pattern Ap,-z-d) as an analysing tool. The elevation-depth... 

Figure 8.3 Theoretical distribution of hydraulic head, groundwater flow, pressure and dynamic pressure increment in a homogeneous drainage basin with simple ground surface geometry (from T6th, 1980. Reprinted by permission of the American Association of Petroleum Geologists).

Subsequently, additional characteristics of the burial-induced hydrodynamic conditions of importance for hydrocarbon migration, such as directions and rates of groundwater flow, zones of concentrated flow, should be determined for each of the subsystems. The shallow subsystem of burial-induced flow can be considered to be hydraulically continuous. Therefore, the concept of dynamic pressure increment, as introduced by T6th (1978 Section 8.2.1) can be used to... 

This conception is useful in aerodynamics as the dynamic pressure represents the unit air pressure acting on a surface increment in almospheric air moving with velocity V over the surface. By Bernoulli s theorem. 

Calculate initial static state, (2) Determine parameters of dynamic model, (3) Calculate dynamic state, (4) Calculate pore water pressure increment and undrained residual strain, (5) Repeat steps of 2-4 till the end of cyclic loading, (6) Continue post-cyclic static analysis until the full dissipation of pore water pressure. 

Using Excel, create a table that shows the air speed for the range of dynamic pressure of 500 to 800 Pa. Use increments of 50 Pa. 

Reynolds equation and deforaatlon equation are derived In complex form for the dynamic Increment of oil film pressure and bearing surface dynamic deformation. The complex amplitudes of dynamic pressure and deformation differentiated with respect to journal motions are solved by numerical methods with Iterations between them> and the whirl ratio at stability threshold Is found by further Iterations, wherefrom the dynamic properties relevant to stability threshold are calculated and from them the stability characteristics. It Is concluded that the effect of dynamic deformation on bearing dynamic properties and stability Is unnegllglble for softer bearing materials. It Is also shown that the two cross damping coefficients differ from each other. Instead of being equal as predicted by the theory for stationary contours. 

To test the hydrodynamic robustness of the surface, the samples were exposed to a 3.2 mm in diameter high-speed water jet with varying dynamic pressures. Contact angle measurements were taken at 10 second increments. Samples were exposed imtil saturation (pores start soaking up... 

A finite element method is employed to study the nonlinear dynamic effect of a strong wind gust on a cooling tower. Geometric nonlinearities associated with finite deformations of the structure are considered but the material is assumed to remain elastic. Load is applied in small increments and the equation of motion is solved by a step-by-step integration technique. It has been found that the cooling tower will collapse under a wind gust of maximum pressure 1.2 psi. 13 refs, cited. 

Mechanistic interpretations The results of the dynamic and equilibrium displacement experiments are used to evaluate and further define mechanisms by which alkaline floods increase the displacement and recovery of acidic oil in secondary mode and the tertiary mode floods. The data sets used in the mechanistic interpretations of alkaline floods are (a) overall and incremental recovery efficiencies from dynamic and equilibrium displacement experiments, (b) production and effluent concentration profiles from dynamic displacement experiments, (c) capillary pressure as a function of saturation curves and conditions of wettability from equilibrium displacement experiments, (d) interfacial tension reduction and contact angle alteration after contact of aqueous alkali with acidic oil and, (e) emulsion type, stability, size and mode of formation. These data sets are used to interpret the results of the partially scaled dynamic experiments in terms of two-stage phase alteration mechanisms of emulsification followed by entrapment, entrainment, degrees and states of wettability alteration or coalescence. 

Here, Ka = static active earth pressure coefficient and AKdyn = incremental dynamic active earth pressure coefficient. In stability calculations the... 

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