Workshop

Workshop “Hydraulic backfill – implementation in underground coal mining in Poland”
Dr hab. inż. Grzegorz Strozik, prof. Politechniki Śląskiej

In the Polish coal mining industry, hydraulic backfilling was used on a massive scale, based on easily sedimenting granular materials with the use of gravitational hydrotransport. The technology of
hydraulic backfill although not technically advanced and nuanced in various aspects of its use, ensures high efficiency and the possibility of using it on a large scale at a relatively low cost –
compared to other types of backfill. In this workshop, designers and consultants of numerous cases of industrial use of hydraulic filling will introduce to the workshop audience the details of this
technology.
The workshop program includes:

1. Hydraulic backfill operations in Poland.
2. Surface and underground infrastructure and equipment.
3. Backfill materials, properties of mixtures and fillings obtained from them.
4. Backfilling procedure.
5. Gravitational flow in pipelines: theory and practice.
6. Procedure for the design of the backfilling process with gravity flow of mixtures.
7. Conclusion.

Workshop “Non-Newtonian fluid flows”

Professor Jerzy Sobota – Wrocław University of Environmental and Life Sciences
Dr. Arno Talmon – Deltares & Delft University of Technology
Dr. Maciej Gruszczyński – Wrocław University of Environmental and Life Sciences

In the mining and food industry there is a problem of precise description of the liquid flow of a non-Newtonian nature. The process medium requires performing rological studies on a rotational or tubular rheometer. Then, the best-suited rheological model and the equation describing the head loss in laminar zone as a function of the rheological parameters of the selected model should be selected. The value of the Reynolds number as a function of velocity should be determined and the head loss in the turbulent zone should be described. Another problems in the design and optimization of the pipe installation for transmission of the non-Newtonian medium is the selection of the diameter and pumps.
The following issues will be discussed during the course:

• Rheology, rheological models
• Rotational and tubular rheometer
• The flow of pastes in the pipes, resistance to flow, calculations for selected rheological models
• Criteria for laminar and turbulent flow
• Criterion of diameter selection in laminar flow
• Laminar flow sedimentation in industrial installations
• The flow of pastes in open channels
• Past spreading angles
• Pump selection in industrial installations
• Applicability criteria for centrifugal / positive displacement pumps
• Laminar flow in industrial installations
• Density meters for pastes, flow meters for pastes.