NDLI: Flow Rate Limitation of Steady Convective Dominated Open Capillary Channel Flows Through a Groove

Content Provider	Springer Nature Link
Author	Haake, Dennis Klatte, Joerg Grah, Aleksander Dreyer, Michael E.
Copyright Year	2009
Abstract	An open capillary channel is a structure that establishes a liquid flow path when the capillary pressure caused by surface tension forces dominates in comparison to the hydrostatic pressure induced by gravitational or residual accelerations. To maintain a steady flow through the channel the capillary pressure of the free surface has to balance the pressure difference between the liquid and the surrounding constant pressure gas phase. Due to convective and viscous momentum transport the pressure along the flow path of the liquid decreases and causes the free surface to bend inwards. The maximum flow rate through the channel is reached when the free surface collapses and gas ingestion occurs near the outlet. This stability limit depends on the geometry of the channel and the properties of the liquid. In this paper we present an experimental setup which is used in the low-gravity environment of the Bremen Drop Tower. Experiments with convective dominated systems have been performed where the flow rate was increased up to the maximum value. In comparison to this we present a one-dimensional theoretical model to determine important characteristics of the flow, such as the free surface shape and the limiting flow rate. Furthermore we present an explanation for the mechanism of flow rate limitation for these flow conditions which is similar to the choking problem for compressible gas flows.
Starting Page	129
Ending Page	138
Page Count	10
File Format	PDF
ISSN	09380108
Journal	Microgravity Science and Technology
Volume Number	22
Issue Number	2
e-ISSN	18750494
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-08-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Free surface flow Capillary channel Critical Convective dominated Microgravity Classical Continuum Physics Extraterrestrial Physics, Space Sciences Aerospace Technology and Astronautics
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Physics and Astronomy Engineering Modeling and Simulation

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