Abstract
A series of laboratory experiments on turbulent open-channel two-phase flow in a form of intense bed load transport is reported. Measurements in a laboratory tilting flume included camera based imaging techniques to identify the structure of the flow at the local level. Obtained experimental distributions of two-phase flow related parameters - granular velocity, concentration, and temperature - across a collisional transport layer are discussed. The results are analysed together with additional measured quantities (discharges of mixture and grains, flow depth, bed slope etc). Our major goal is to evaluate the distribution of granular stresses across the transport layer with a special attention paid to the interface between the transport layer and the bed. Furthermore, comparisons are discussed between the experimental results and predictions produced by suitable kinetic-theory based models.
Highlights
Intense bed load transport is associated with flood discharges in steep-slope mountain torrents and rivers
The analysis evaluates an interesting change in a trend in a relation between the flow depth and the bed slope
Kinetic theory for granular flows offers constitutive relations which relate depth distributions of granular stresses with depth distributions of concentration and velocity in solid-fluid flows dominated by granular collisions
Summary
Intense bed load transport is associated with flood discharges in steep-slope mountain torrents and rivers. It can be generated by transient flows, e.g. dam-break flows, in a channel with a mobile bed. The liquid- and solid phases interact in a complex way within a bed load layer developed above a mobile bed. Transported sediment grains are supported by mutual contacts, primarily collisions, and by residual turbulent uplift. It is poorly understood how to describe mechanisms that interrelate parameters like the sediment discharge and the flow depth. The parameters are dependent on distributions of velocity and concentration of solid grains in the flow and on distributions of normaland shear stresses by solids
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
