English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this paper, we have designed and employed a suspended-wall silo to removeJanssen effect in order to explore directly the local pressure dependence ofGranular Orifice Flow (GOF) systematically. We find that as Janssen effect isremoved, the flow rate Q changes linearly with the external pressure. The slope{\alpha} of the linear change decays exponentially with the ratio of the silosize and the size of the orifice {\Phi}/D, which suggests the existence of acharacteristic ratio {\lambda} (~2.4). When {\Phi}/D > {\lambda}, {\alpha}gradually decays to zero, and the effect of external pressure on the GOFbecomes negligible, where the Beverloo law retrieves. Our results show thatJanssen effect is not a determining factor of the constant rate of GOF,although it may contribute to shield the top load. The key parameter in GOF is{\Phi}/D. In small {\Phi}/D, the flow rate of GOF can be directly adjusted bythe external pressure via our suspended-wall setup, which may be useful to thetransportation of granules in microgravity environment where the gravity-drivenBeverloo law is disabled.

External pressure dependence of Granular Orifice Flow: transition to Beverloo flow