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Rheological investigations of paraffin based phase change slurry using a pipe viscosimeter

Études rhéologiques portant sur un coulis à changement de phase à base de paraffine en utilisant un viscosimètre à écoulement
 
: Kappels, Tobias; Hanu, Lucian George; Pollerberg, Clemens

:
Volltext urn:nbn:de:0011-n-4173822 (400 KByte PDF)
MD5 Fingerprint: 7b35dc7912df0a73cd5bff402feebbd5
Erstellt am: 10.11.2016


International Institute of Refrigeration -IIR-; International Institute of Refrigeration -IIR-, Commission Thermodynamics and Transfer Processes, Paris; International Institute of Refrigeration -IIR-, Commission Refrigerating Equipment, Paris; International Institute of Refrigeration -IIR-, Commission Refrigerated Storage, Paris:
11th IIR Conference on Phase Change Materials and Slurries for Refrigeration and Air Conditioning 2016. Proceedings : Karlsruhe, Germany, May 18-20, 2016, CD-ROM
Paris: IIF/IIR, 2016 (Science et technique du froid 2016-2)
ISBN: 978-2-36215-015-9
S.51-60
Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning (PCM) <11, 2016, Karlsruhe>
Englisch
Konferenzbeitrag, Elektronische Publikation
Fraunhofer UMSICHT Oberhausen ()
paraffin-water dispersion; phase change slurry (PCS); pipe viscometer; rheology measurements

Abstract
In this work paraffin/water dispersions used as phase change slurries (PCS) for thermal energy storage systems have been investigated regarding their rheological behaviour. The fluids viscosity is an important parameter for dimensioning of the main peripheral components of storage systems like pumps, valves and piping. The experiments have been conducted with a pipe viscosimeter at different fluid temperatures, shear rates and varying paraffin fraction (25, 30 and 35 wt. %). The measurements show viscosity values between 2.8 and 27.7 mPas depending on the set conditions. The paraffin/water dispersions show a shear thinning behaviour with a strong temperature dependency and a discontinuity during the phase change of the paraffin fraction. Consequently, reliable measurement results are now available to design technical systems based on such paraffin/water dispersions.

: http://publica.fraunhofer.de/dokumente/N-417382.html