Anomalous pressure drop in settling slurry flow through pipe of mild negative slope

Kód výsledku v IS VaVaI

RIV/67985874:_____/19:00517695 - isvavai.cz

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Anomalous pressure drop in settling slurry flow through pipe of mild negative slope

Popis výsledku v původním jazyce

In an inclined pipe carrying settling slurry, the manometric pressure drop tends to increase with the increasing angle of inclination primarily due to the increasing static contribution affected by the slurry density. Our experiments show that, surprisingly enough, this trend is not continuous if a broad range of inclination angles is considered, including negative angles (i.e. descending flows). Instead, a local peak occurs in the manometric pressure drop at the angle of about – 15 degrees. The observed effect is associated with changes in solids distribution caused by a variation in the angle of inclination. In the paper, the effect is explained using measured solids distributions and using an analysis of governing mechanisms. It is demonstrated that this effect can be predicted by a layered model for inclined settling slurry flows. Model predictions of negatively sloped flows are discussed in further details, particularly predictions of descending flows near the deposition limit.

Název v anglickém jazyce

Anomalous pressure drop in settling slurry flow through pipe of mild negative slope

Popis výsledku anglicky

In an inclined pipe carrying settling slurry, the manometric pressure drop tends to increase with the increasing angle of inclination primarily due to the increasing static contribution affected by the slurry density. Our experiments show that, surprisingly enough, this trend is not continuous if a broad range of inclination angles is considered, including negative angles (i.e. descending flows). Instead, a local peak occurs in the manometric pressure drop at the angle of about – 15 degrees. The observed effect is associated with changes in solids distribution caused by a variation in the angle of inclination. In the paper, the effect is explained using measured solids distributions and using an analysis of governing mechanisms. It is demonstrated that this effect can be predicted by a layered model for inclined settling slurry flows. Model predictions of negatively sloped flows are discussed in further details, particularly predictions of descending flows near the deposition limit.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

GA17-14271S: Vliv sklonu potrubí na kritickou rychlost a rychlost skluzu heterogenní suspenze

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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