12:00 PM - 12:15 PM
[STT47-12] Reproduction of complicated scale form in pipe systems from hydrodynamic perspectives
Keywords:scale, silica scale, geothermal, hydrodynamics
In this study, we first demonstrate the result of the new elaborative calculation to show how the Brownian motion influences the kinematic behavior of silica particles that lead us to a new expression of the scale deposition rate as a function of flow velocity. Next, as in the previous study, we attempted to visualize a time sequence of the scale shape in a pipe with the macroscopic analysis using LBM coupled with the microscopic calculation. At this time, in order to increase the stability of the crystal growth, we introduced a calculation that automatically complements the cavity grids due to random scale generation. Furthermore, the holding effect on silica particles by the normal flow to the wall was also taken into consideration.
As a result of these modifications, we succeeded not only to describe the process of pipe clogging due to scale deposition stably, but also to reproduce the complicated scale development protruding into the flow due to the influence from flow properties in the field. Our simulation proved that an approach based on physics works effective for the analysis of scale deposition and could be extended as a hybrid model that accommodate chemical parameters such as pH and temperature for further improvement.