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Original title:
Stationary- and sliding beds in pipe flows of settling slurry
Authors: Matoušek, Václav ; Krupička, Jan ; Chára, Zdeněk
Document type: Papers
Conference/Event: 15th International Freight Pipeline society symposium, Praha (CZ), 2014-06-24 / 2014-06-27
Year: 2014
Language: eng
Abstract: Investigations are discussed on the effect of stationary- and sliding beds on a behavior of settling slurry flows. Results are presented of our recent experiments with two fractions of ballotini in a 100-mm-pipe loop. Experimental work contained measurements of concentration profiles and velocity profiles. The experimental results for flows with stationary deposits are compared with predictions using our formulae for solids transport and bed friction in layered flows. CFD simulations are included to validate the velocityprofile measurements and to verify the bed roughness predictions in the flows with stationary beds. Furthermore, the measured velocity profiles are compared to profiles predicted using the log law of the wall with boundary shear velocities determined from the linear distribution of shear stress across the pipe flow. The approach is successful in the flow below the upper wall of the pipe but fails above the top of the deposit where the stress distribution is different as verified by the CFD simulation. The concept of the linear-distribution of shear stress is well applicable in flows with sliding beds. An example is given of a solution for a partially-stratified flow with sliding bed using the 1-D Stress- Distribution based Model.
Keywords: concentration profile; experiment; hydraulic transport; sheet flow; velocity profile
Project no.: GA105/10/1574 (CEP), GAP105/10/1574 (CEP)
Funding provider: GA ČR, GA ČR
Host item entry: 15th International Freight Pipeline society symposium, ISBN 978-80-87117-12-5
Institution: Institute of Hydrodynamics AS ČR (web)
Document availability information: Fulltext is available on demand via the digital repository of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0234694
Permalink: http://www.nusl.cz/ntk/nusl-174827
The record appears in these collections:
Research > Institutes ASCR > Institute of Hydrodynamics
Conference materials > Papers
Authors: Matoušek, Václav ; Krupička, Jan ; Chára, Zdeněk
Document type: Papers
Conference/Event: 15th International Freight Pipeline society symposium, Praha (CZ), 2014-06-24 / 2014-06-27
Year: 2014
Language: eng
Abstract: Investigations are discussed on the effect of stationary- and sliding beds on a behavior of settling slurry flows. Results are presented of our recent experiments with two fractions of ballotini in a 100-mm-pipe loop. Experimental work contained measurements of concentration profiles and velocity profiles. The experimental results for flows with stationary deposits are compared with predictions using our formulae for solids transport and bed friction in layered flows. CFD simulations are included to validate the velocityprofile measurements and to verify the bed roughness predictions in the flows with stationary beds. Furthermore, the measured velocity profiles are compared to profiles predicted using the log law of the wall with boundary shear velocities determined from the linear distribution of shear stress across the pipe flow. The approach is successful in the flow below the upper wall of the pipe but fails above the top of the deposit where the stress distribution is different as verified by the CFD simulation. The concept of the linear-distribution of shear stress is well applicable in flows with sliding beds. An example is given of a solution for a partially-stratified flow with sliding bed using the 1-D Stress- Distribution based Model.
Keywords: concentration profile; experiment; hydraulic transport; sheet flow; velocity profile
Project no.: GA105/10/1574 (CEP), GAP105/10/1574 (CEP)
Funding provider: GA ČR, GA ČR
Host item entry: 15th International Freight Pipeline society symposium, ISBN 978-80-87117-12-5
Institution: Institute of Hydrodynamics AS ČR (web)
Document availability information: Fulltext is available on demand via the digital repository of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0234694
Permalink: http://www.nusl.cz/ntk/nusl-174827
The record appears in these collections:
Research > Institutes ASCR > Institute of Hydrodynamics
Conference materials > Papers
Record created 2014-07-24, last modified 2023-12-06