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Most of the data reported are for the laminar and turbulent flow, data laminar and turbulent flow pdf download also included the start-up flow development. Check if you have access through your login credentials or your institution. The floww Reynolds numbers from which the experimental results depart from the laminar solution are determined and compared with phenomenological criteria.
Laminar transitional and turbulent flow of yield stress fluid in a pipe – ScienceDirect
The results show that laminar and turbulent flow pdf download yield stress contribute to stabilize the flow. The purpose of this paper is to investigate rheology and hydrodynamic behavior of different dowjload concentration of bentonite suspensions in pipe flow. Then, with increasing the Reynolds number, the fluctuations increase in the whole section because of the apparition of turbulent spots.
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Laminar & Turbulent Flow.pdf
Concerning the transition for a yield stress fluid it has been observed an increase of the lminar mean square rms of the axial velocity outside a region around the axis while it remains at a laminar level inside this region. In the laminar regime, the flow parameters were fitted by using the Herschel—Bulkley model.
Recommended articles Citing articles 0. The time trace of the turbulent spots are presented and turbluent for the different fluids. The flow is monitored using pressure and laser Doppler axial velocity measurements.
Trubulent, a description of the turbulent flow is presented and shows that the rms axial velocity profile for laminar and turbulent flow pdf download Newtonian and non-Newtonian fluids are similar except in the vicinity of the wall where the turbulence intensity is larger for the non-Newtonian fluids.
In the majority of cases, axisymmetric flow is observed for both laminar and turbulent flow conditions.
Detailed rheological properties simple shear viscosity and first normal stress difference are presented. Check if you have access through your login credentials or your institution.
For the turbulent flow, the Dodge and Metzner model was applied to fit the experimental data. The axial velocity distribution was determined using a Ultrasonic Pulsed Doppler Velocimetry technique.
Laminar & Turbulent 01 | Laminar Flow | Reynolds Number
Peixinho a b C. Three fluids are used: Also an asymmetry characterizes the axial velocity profiles in the laminar-turbulent transitional flow.
Author links open overlay panel A. Author links open overlay panel J. Abstract This paper presents an experimental study of the laminar, transitional and turbulent flows in a cylindrical pipe facility 5.
Bentonite suspensions exhibited shear thinning and yield stress non-Newtonian rheological behavior. This paper presents an experimental study of the laminar, transitional and turbulent flows in a cylindrical pipe facility 5.
Abstract The purpose of this paper is to investigate rheology and hydrodynamic behavior of different mass concentration of tuebulent suspensions in pipe flow.
The experimental results show a progressive destructuration of the suspensions in the entrance region due to the segregation of the structural elements of the fluid and tend to a steady state and a fully developed laminar pipe flow.