Sape Miedema
Articles By Sape Miedema
Study of slurry transport characteristics in a jet pump
In this study, the computational fluid dynamics (CFD) analysis method was used to simulate the mixing and transportation characteristics of water and mud in a jet pump. By observing the fluid mixing law in the mixing chamber, throat and other structures, the internal flow field distribution of the jet pump under different working conditions was compared and studied. As a result, the internal flow details and operation performance curves of a certain size jet mud pump were obtained. It provides theoretical support for the optimisation design of a slurry jet pump in dredging engineering.
Experimental study on the adhesion factor of clay
A major mechanical property of clay is the adhesion factor that reflects the ratio between its cohesive and adhesive strength under different water content.
Modelling the waterjet cable trenching process on sand dunes
Cables for offshore wind farms in the North Sea are buried for protection. A highly variable seabed topography influences the trenching process in sandy soils. A model has been developed to estimate the influence of sand dunes on the trenching process.
Can a preliminary model describe CSD spillage due to centrifugal advection?
Depending on its size and installed power, a Cutter Suction Dredger is capable of cutting a wide range of soil types. Although precise and relatively efficient, a CSD can spill significantly. The authors propose a preliminary model which describes spillage due to centrifugal advection.
Which slurry transport regime should be used and why?
With five possible flow regimes to choose from for slurry transport, selecting just one can require consideration. Fortunately, one of these regimes has a simple criterion: a ratio of the particle diameter to the pipe diameter.