The effect of mechanical forces on adhesive strength in bridging flocculation

Mühle, K.

doi:10.1016/0166-6622(87)80224-x

Cited by 14 publications

(4 citation statements)

References 29 publications

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“…Evidence supporting the bridge-like character of attachment resulting from the use of retention aids has been based on the kinetics of agglomeration in flow, [73] factors affecting the strength of the resulting attachments, [75][76][77][78][79] and the irreversible characteristics of flocculation with very-highmass polyelectrolytes. [55,[80][81][82] Experimental evidence from surface force measurements has been reported recently in which long-range bridging attraction was measured upon retraction of surfaces covered by adsorbed polyelectrolytes.…”

Section: Flocculation By Polyelectrolytesmentioning

confidence: 99%

The Dispersion Science of Papermaking

Rojas

Hubbe

2005

Journal of Dispersion Science and Technology

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Paper is one of the most important inventions in the history of civilization, and it is an essential commodity to all people in the world. The fact that we make ubiquitous use of a score of paper products makes it easy to underestimate its value and significance. This review is intended to put into perspective the dispersion science involved in papermaking and to describe how our understanding of key processes has evolve since its conception, approximately 2000 years ago, from art to science. Paper is formed from a slurry of fibers and much smaller particles that are often called "fines" and other chemical additives. Ahead of the paper forming process the slurry is subjected to a series of steps, including treatment with polyionic species and passage through unit operations that impose shear forces on the papermaking suspension. These steps alternately disperse the solids apart or re-gather them back together. The overall process is optimized to achieve a highly uniform product, while at the same time achieving high efficiency in retaining fines in the sheet and allowing water to drain relatively quickly from the wet paper as it is being formed. As we approach the 1900-year anniversary of the first detailed account of the papermaking process, it is the goal of this review to explore the scientific principles that underlie the art of papermaking, emphasizing the state of dispersion of the fibrous slurries during various stages of the manufacturing process. Some concepts that arise out of the experience of papermakers have potential applications in other fields.

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Section: Flocculation By Polyelectrolytesmentioning

confidence: 99%

The Dispersion Science of Papermaking

Rojas

Hubbe

2005

Journal of Dispersion Science and Technology

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“…This implies that natural coagulants can be utilized within a batch stirred tank setup to treat contaminated industrial wastewaters, at least in a mechanical sense, since bridging linkages are more resistant to breakage at high shear levels. Muhle in 1985 [57] and 1987 [58] in particular, provided interesting empirical findings on the particle adhesion forces between polymers and particles and effects due to mechanical forces within batch stirred vessels. An underlying observation regarding these studies is that the stronger the flocs, the larger they can grow under given shear conditions.…”

Section: Treatment Of Industrial Wastewatersmentioning

confidence: 99%

Emerging usage of plant-based coagulants for water and wastewater treatment

Yin

2010

Process Biochemistry

470

244

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“…For the fraction of the particle population in which the cohesive/adhesive force is sufficiently strong, particle–particle interactions will encourage aggregation through a fractal-type structure (wherein the fractal dimension is expected to vary with system properties), and particle–wall interactions will encourage deposition. , The force balance that governs this relationship has been presented in detail , and requires particular attention to ensure hydrocarbon thermophysical properties and phase behavior are considered correctly. Initially following the basis of Mills, resultant estimates of the hydrate-laden slurry’s relative viscosity can be calculated for a nominated control volume; as a more viscous slurry requires additional momentum energy, slurries that feature severe shear thickening behavior engender the risk of a positive feedback mechanism as momentum is depeleted in the control volume.…”

Section: Mechanistic Insight Into Hydrate Blockage Formationmentioning

confidence: 99%

Hydrate Risk Management in Gas Transmission Lines

Aman

2021

Energy Fuels

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Gas hydrates are ice-like solids that can readily form and restrict flow in high-pressure natural gas transmission lines. The use of antifreeze thermodynamic inhibitors dominated production systems throughout the 20th century, where most research necessarily focused on measuring and predicting the hydrate phase boundary. In the 21st century, market competitiveness and environmental constraints have motivated a paradigm shift toward the identification and management of hydrate blockage risks, which has largely been facilitated to date through two research efforts: establishing and continuously refining mechanistic models to predict hydrate blockage formation; and exploiting critical stages within that blockage mechanism to develop novel, environmentally compatible inhibitors. This review presents a historical perspective on the development of an oil-dominant blockage mechanism and the technologies enabled by these efforts. Efforts over the past decademade possible through the collaboration between industry, the Australian government, and academiaare then summarized in the context of producing the first mechanistic blockage model for gas-dominant transmission lines, including the role of innovative high-pressure pilot-scale flowloop systems. Together, these blockage mechanisms have enabled new opportunities to develop and deploy low-dosage hydrate inhibitorsincluding the creation of new experimental capabilities that can be used to quantify occurrence probability or severity and the transient simulation tools that can leverage such knowledgethat support the ability to quantitatively manage hydrate blockage risk in hydrocarbon transmission lines. As they offer superior resolution in performance assessment to first-generation approaches, these new experimental methods offer structure–function design and optimization of low-dosage inhibitors against secondary, environmental parameters.

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The effect of mechanical forces on adhesive strength in bridging flocculation

Cited by 14 publications

References 29 publications

The Dispersion Science of Papermaking

The Dispersion Science of Papermaking

Emerging usage of plant-based coagulants for water and wastewater treatment

Hydrate Risk Management in Gas Transmission Lines

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