Solids flow basics: two-phase design lessons for bulk handling engineers
Reviewed by Joe Ashwell

First reported on Australian Mining
30 Second Briefing
Two-phase flow between solid particles and interstitial air is shown to control how powders settle, discharge and move through hoppers, chutes and transfer points, with air pressure gradients often dominating behaviour in fine or aeratable materials. Jenike & Johanson’s microlearning session explains how phenomena such as flooding, ratholing and erratic discharge arise when air cannot escape freely, and why conventional single-phase flow assumptions fail. The content points engineers towards incorporating air permeation, deaeration and venting design into bulk solids handling calculations and equipment selection.
Technical Brief
- Conceptual models distinguish between coarse, fine and aeratable powders with differing air–permeation behaviours.
- Safety emphasis is on preventing uncontrolled powder surges, blockages and unexpected flow stoppages during operation.
- Guidance includes designing air escape paths, venting and deaeration features as explicit safety measures.
- Training is framed as foundational knowledge for hazard analysis in bulk solids handling systems.
- Scope is introductory; it outlines mechanisms and design levers but does not present new experimental data.
Our Take
Jenike & Johansen’s focus on solids flow fundamentals complements other Australian Mining coverage on dust and emissions control (for example the Nederman MikroPul piece), signalling that bulk material handling risks are being treated more holistically from chute design through to air quality management.
For Australian operations moving towards more automated and AI-enabled plants (as highlighted in the recent digital ecosystems article involving Australian Mining), reliable solids flow behaviour is a prerequisite; poor hopper and transfer design can undermine the performance of otherwise sophisticated control systems.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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