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Analytical Description of the Flow Behavior of Extended Herschel-Bulkley Fluids with Regard to Gel Propellants

Madlener, Klaus and Ciezki, Helmut (2005) Analytical Description of the Flow Behavior of Extended Herschel-Bulkley Fluids with Regard to Gel Propellants. In: Energetic Materials - Performance und Safety, 186-1-186-13. 36th International Annual Conferece of ICT, 2005-06-28 - 2005-07-01, Karlsruhe (Germany). ISSN 0722-4087

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Abstract

Gel propellants are shear-thinning fluids, which have in many cases a distinct yield stress at low shear rates and/or a constant viscosity at high shear rates. Their viscosity behavior can be described by an extended formulation of the Herschel-Bulkley equation with an additional term containing the theoretical constant viscosity value of the high shear rate range. In this paper the general equations of the flow behavior of fluids with an exponential factor n=0.5 are analytically derived for steady, fully developed and laminar flows through constant area tubes. Velocity profiles and shear rate distributions are shown for different fluids and boundary conditions also in comparison to the common Herschel-Bulkley approach. The shape of this Extended Herschel-Bulkley velocity profile depends upon a derived dimensionless number k<sub>HBE</sub> and the ratio of the yield stress to wall shear stress.

Item URL in elib:https://elib.dlr.de/50502/
Document Type:Conference or Workshop Item (Paper, Poster)
Title:Analytical Description of the Flow Behavior of Extended Herschel-Bulkley Fluids with Regard to Gel Propellants
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Madlener, KlausUNSPECIFIEDUNSPECIFIED
Ciezki, HelmutUNSPECIFIEDUNSPECIFIED
Date:June 2005
Journal or Publication Title:Energetic Materials - Performance und Safety
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:186-1-186-13
Editors:
EditorsEmail
FhG-ICT, UNSPECIFIED
ISSN:0722-4087
Status:Published
Keywords:gelled fuels, gelled propellants, non-Newtonian fluid, flow properties, rheology
Event Title:36th International Annual Conferece of ICT
Event Location:Karlsruhe (Germany)
Event Type:international Conference
Event Dates:2005-06-28 - 2005-07-01
Organizer:Fraunhofer-Institut für Chemische Technologie
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Military Technologies (old)
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Technologie
Deposited By: Ciezki, Dr.-Ing. Helmut
Deposited On:07 Aug 2007
Last Modified:27 Apr 2009 14:10

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