Flow rate limitation in open capillary channel flows.

Abstract:

:This paper reports the experimental and theoretical investigations of forced liquid flows through open capillary channels under reduced gravity conditions. An open capillary channel is a structure that establishes a liquid flow path at low Bond numbers, when the capillary pressure caused by the surface tension force dominates in comparison to the hydrostatic pressure induced by gravitational or residual accelerations. In case of steady flow through the channel, the capillary pressure of the free surface balances the pressure difference between the liquid and the surrounding constant-pressure gas phase. Because of convective and viscous momentum transport, the pressure along the flow path decreases and causes the free surface to bend inward. The maximum flow rate is achieved when the free surface collapses and gas ingestion occurs at the outlet. This critical flow rate depends on the geometry of the channel and the properties of the liquid. In this paper we present a comparison of the theoretical and experimental critical flow rates and surface profiles for convective dominated flows. For the prediction of the critical flow rate a one-dimensional theoretical model taking into account the entrance pressure loss and the frictional pressure loss in the channel is developed.

journal_name

Ann N Y Acad Sci

authors

Haake D,Rosendahl U,Ohlhoff A,Dreyer ME

doi

10.1196/annals.1362.031

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

443-58

eissn

0077-8923

issn

1749-6632

pii

1077/1/443

journal_volume

1077

pub_type

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