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A novel method for calculating the dynamic capillary force and correcting the pressure error in micro-tube experiment.

Abstract：

:Micro-tube experiment has been implemented to understand the mechanisms of governing microcosmic fluid percolation and is extensively used in both fields of micro electromechanical engineering and petroleum engineering. The measured pressure difference across the microtube is not equal to the actual pressure difference across the microtube. Taking into account the additional pressure losses between the outlet of the micro tube and the outlet of the entire setup, we propose a new method for predicting the dynamic capillary pressure using the Level-set method. We first demonstrate it is a reliable method for describing microscopic flow by comparing the micro-model flow-test results against the predicted results using the Level-set method. In the proposed approach, Level-set method is applied to predict the pressure distribution along the microtube when the fluids flow along the microtube at a given flow rate; the microtube used in the calculation has the same size as the one used in the experiment. From the simulation results, the pressure difference across a curved interface (i.e., dynamic capillary pressure) can be directly obtained. We also show that dynamic capillary force should be properly evaluated in the micro-tube experiment in order to obtain the actual pressure difference across the microtube.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wang S,Liu P,Zhao H,Zhang Y

doi

10.1038/s41598-017-16870-9

subject

Has Abstract

pub_date

2017-11-29 00:00:00

pages

16590

issue

1

issn

2045-2322

pii

10.1038/s41598-017-16870-9

journal_volume

7

pub_type

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