Dredging Technology
by Van der Schrieck
Understanding the world of sand and water
This book covers the Chapters 1.8 and 5.1.11 of the main book: “Dredging Technology Book 1“.
Hydraulic topics in this book are:
1 Water jet theory;
2 Nozzle design;
3 Ejector pump theory.
Above the water level a water jet looks very impressive but as soon as the water jet is submerged the energy of the jet dissipates very fast in the surrounding water. Already at a short distance of 12 times the nozzle diameter the centre jet velocity is halved and the jet pressure is reduced to 25%! Often the design of a nozzle and the inflow to a nozzle is very poor resulting in large energy losses. The advantage of an Ejector pump is the absence of the impeller. The disadvantage is the low efficiency of an Ejector pump.
This book covers the Chapters 1.8 and 5.1.11 of the main book: “Dredging Technology Book 1“.
Hydraulic topics in this book are:
1 Water jet theory;
2 Nozzle design;
3 Ejector pump theory.
Above the water level a water jet looks very impressive but as soon as the water jet is submerged the energy of the jet dissipates very fast in the surrounding water. Already at a short distance of 12 times the nozzle diameter the centre jet velocity is halved and the jet pressure is reduced to 25%! Often the design of a nozzle and the inflow to a nozzle is very poor resulting in large energy losses. The advantage of an Ejector pump is the absence of the impeller. The disadvantage is the low efficiency of an Ejector pump.