Viscosity and Electrical Conductivity of Concentrated Solutions of Soluble Coffee.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F02%3A27013074" target="_blank" >RIV/67985858:_____/02:27013074 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985858:_____/02:27020045 RIV/68407700:21220/02:00085243

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Viscosity and Electrical Conductivity of Concentrated Solutions of Soluble Coffee.

Popis výsledku v původním jazyce

An experimental investigation was done by the use of visual observations and the electrochemical technique in order to study the appearance of hydrodynamic instabilities at low Re-axg in the gap between two coaxial cylinders, with radius ratio R-r/R-s =0.615 and aspect ratio L/e = 24. A motor drove the inner cylinder and the outer cylinder was fixed. A Newtonian fluid (Emkarox HV45) and two non-Newtonian fluids (aqueous solutions of guar and CMC) have been used. The analysis of the evolution of the size of the Taylor vortices is carried out for Re-axg < 4.0. For Re-axg < 2 we showed that the vortices underwent a contraction phase up to Ta-g approximate to 80, and a stretching phase for Ta-g > 80. For higher Re-axg, the contraction phase vanished and the vortices progressively stretched with increasing Ta-g. A dimensionless representation was also proposed for wall friction generalized to non-Newtonian fluids following the Ostwald law.

Název v anglickém jazyce

Viscosity and Electrical Conductivity of Concentrated Solutions of Soluble Coffee.

Popis výsledku anglicky

An experimental investigation was done by the use of visual observations and the electrochemical technique in order to study the appearance of hydrodynamic instabilities at low Re-axg in the gap between two coaxial cylinders, with radius ratio R-r/R-s =0.615 and aspect ratio L/e = 24. A motor drove the inner cylinder and the outer cylinder was fixed. A Newtonian fluid (Emkarox HV45) and two non-Newtonian fluids (aqueous solutions of guar and CMC) have been used. The analysis of the evolution of the size of the Taylor vortices is carried out for Re-axg < 4.0. For Re-axg < 2 we showed that the vortices underwent a contraction phase up to Ta-g approximate to 80, and a stretching phase for Ta-g > 80. For higher Re-axg, the contraction phase vanished and the vortices progressively stretched with increasing Ta-g. A dimensionless representation was also proposed for wall friction generalized to non-Newtonian fluids following the Ostwald law.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2002

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Food Engineering

ISSN

0260-8774

e-ISSN

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Svazek periodika

51

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

6

Strana od-do

93-98

Kód UT WoS článku

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EID výsledku v databázi Scopus

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