Abstract
Turbulent tube flow and the flow through a porous medium of aqueous hydroxypropylguar (HPG) solutions in concentrations from 100 wppm to 5000 wppm is investigated. Taking the rheological flow curves into account reveals that the effectiveness β in turbulent tube flow and the efficiency κ for the flow through a porous medium both start at the same onset wall shear stress of 1.3 Pa. The similarity of the curves β = β(τ w ) and κ = κ(τ w ), respectively, leads to a simple linear relation β/κ =k, where the constantk or proportionality depends uponc. This offers the possibility to deduce β (for turbulent tube flow) from κ (for flow through a porous medium). In conjunction with rheological data, β will reveal whether, and if yes to what extent, drag reduction will take place (even at high concentrations). The relation of our treatment to the model-based Deborah number concept is shown and a scale-up formula for the onset in turbulent tube flow is deduced as well.
Sign-in/Register to access full text options 
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.
