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2 results about "Pressure jump" patented technology
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Pressure jump is a technique used in the study of chemical kinetics. It involves making rapid changes to the pressure of an experimental system and observing the return to equilibrium or steady state. This allows the study of the shift in equilibrium of reactions that equilibrate in periods between milliseconds to hours (or longer), these changes often being observed using absorption spectroscopy, or fluorescence spectroscopy though other spectroscopic techniques such as CD, FTIR or NMR can also be used.
A method for evaluating hydrodynamic response of flexible floating structure considering equivalent effect of upper layer stagnant water
This invention discloses a method for evaluating the hydrodynamic response of flexible floating structures considering the equivalent effect of impermeable upper water. First, a three-dimensional hydroelastic-porous sidewall coupled model is established, equating the flexible structure to an elastic disk below the still water surface, with the outer impermeable boundary equivalent to a porous sidewall with minimal permeability. By dividing the external water area, the internal confined overlying water layer, and the lower water body and defining velocity potentials, semi-analytical solutions for the velocity potentials of each region are constructed using the separation of variables method and the eigenfunction expansion method. Combining fluid continuity conditions and porous sidewall matching conditions with pressure jump compensation, watershed matching is performed to solve for each modal coefficient, and then wave excitation force, deflection response, and free surface response are calculated. This invention, through layered modeling and near-impermeable boundary equivalence treatment, evaluates the water-blocking effect of the solid floating ring and the influence of the confined overlying water layer on the hydrodynamic response of the flexible structure, providing a theoretical basis for the structural optimization and wave-resistant design of floating photovoltaic systems under impermeable upper water conditions.
Owner:TIANJIN RES INST FOR WATER TRANSPORT ENG M O T
High-density-ratio bubble rising behavior numerical calculation method based on LSMPS
PendingCN121997804Aeffective simulationDesign optimisation/simulationCAD numerical modellingHigh densityUpflow velocity
The invention discloses a high-density-ratio bubble rising behavior numerical calculation method based on LSMPS. The method is specifically implemented according to the following steps that 1, a two-dimensional axisymmetric single bubble rising calculation model is established based on a meshless moving particle semi-implicit method; 2, calculating the temporary speed of the particles; 3, calculating the pressure of gas particles and interface node particles; step 4, calculating pressure jump of interface node particles; 5, calculating the pressure of the liquid particles; step 6, correcting the speed of the particles; 7, updating the positions of the particles and the interface node particles; and step 8, analog calculation and result export. According to the method, an axial symmetry model is adopted, rising behaviors of air bubbles in water and nitrogen bubbles in lead-bismuth alloy are numerically simulated, evolution of a bubble interface can be accurately captured, the total rising speed of the bubbles and the change rule of the speeds of the tops and the bottoms of the bubbles are analyzed, and the evolution process of the mass center height, the size, the surface area and the aspect ratio of the bubbles along with time is obtained.
Owner:XIAN UNIV OF TECH