The influence of a cone-in-cone insert on flow pattern and wall pressure in a full-scale silo

Härtl, Johannes; Ooi, J.Y.; Rotter, J. M.; Wójcik, Michał; Ding, Shuiting; Enstad, Gisle G.

doi:10.1016/j.cherd.2007.07.001

Cited by 55 publications

(30 citation statements)

References 6 publications

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“…However, many uncertainties still remain (Dogangun et al, 2009;Ayuga, 2008;Nielsen, 2008) since the laws which control the behavior of materials stored in silos are not totally understood. The highest thrust forces exerted by the stored materials on the walls occur during discharge (Ramirez et al, 2010;Härtl et al, 2008;EN 1991EN -4, 2006Ayuga et al, 2001;Zhong et al, 2001;Askegaard and Munch-Andersen, 1985). The emptying of a silo is also a complex phenomenon which depends of the type of flow of the material (Chen et al, 2007;Jenike and Johanson, 1969).…”

Section: Introductionmentioning

confidence: 98%

“…Therefore, very few assays can be found in the literature (Härtl et al, 2008;Teng et al, 2005;Askegaard and Munch-Andersen, 1985;Chen et al, 2005Chen et al, , 2007Ooi and Rotter, 1990;Rotter et al, 2002;Wu et al, 2009;Yang and Hsiau, 2001).…”

Section: Introductionmentioning

confidence: 98%

“…Due to the high investment required, there are very few experimental installations in the world with full-scale silos (Brown et al, 2000;Härtl et al, 2008;Ramirez et al, 2010;Schurich et al, 2001;Teng and Chan, 2001;Teng et al, 2005;Zhong et al, 2001) for determining the actions produced by the stored materials. Therefore, very few assays can be found in the literature (Härtl et al, 2008;Teng et al, 2005;Askegaard and Munch-Andersen, 1985;Chen et al, 2005Chen et al, , 2007Ooi and Rotter, 1990;Rotter et al, 2002;Wu et al, 2009;Yang and Hsiau, 2001).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of silo filling and discharge using ANSYS and comparison with experimental data

Gallego

Ruíz

Rodríguez

2015

Computers and Electronics in Agriculture

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simulation of silo filling and discharge using ANSYS and comparison with experimental data

Gallego

Ruíz

Rodríguez

2015

Computers and Electronics in Agriculture

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“…The pressure transducers were specially designed for silo pressure measurement. Great care was taken to ensure that the face of the interacting plate of the pressure transducer had minimum protrusion into the stored solids in silo (Härtl, et al, 2007;Wojcik, et al, 2006;Ding, 2004). The small gap between the plate of transducers and the hopper wall were sealed using silicon paste.…”

Section: Measurement Methods and Its Readingsmentioning

confidence: 99%

“…Without the insert, the discharge was a typical pipe flow. With the presence of the double cone insert, a considerable enlargement of the moving zone was seen, the flow appeared to be an expanded funnel flow; (mass flow was not achieved though (Härtl, et al, 2007;Wojcik, et al, 2006;Ding, 2004). The normal wall pressures thus developed in those processes of discharging were measured.…”

Section: Loads Measurement During Dischargementioning

confidence: 99%

Experimental Investigation of Load Exerted on a Double-Cone Insert and Effect of the Insert on Pressure Along Walls of a Large-Scale Axisymmetrical Silo

Ding

Dyrøy

Karlsen

et al. 2011

Particulate Science and Technology

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Applications of flow aid devices (commonly referred as inserts) improve the silo discharging mode. Considerable efforts have been made in finding best configurations between the inserts and silos to achieve the optimal functional results. In the present investigation, experiments were carried out to measure the loads imposed on a double cone insert by the particulate solids (free flow sand) when it was fitted within an axisymmetrical large scale silo. A concentric filling / discharging was implemented to fulfil such measurements. Pressures developed along the walls of the silo were also measured.Analyses of the measurement results showed that: 1.) the loads on insert were rather stable in total, but appeared to be asymmetrical at the end filling; 2.) a sudden increase was observed of the loads on the insert at the transition from filling to discharging, this increase did not last soon afterward; 3.) such loads decreased slowly but remained rather high for large part of discharge. Effects of the double cone insert on the pressures along the silo walls were discussed.Keyword: Experimental investigation, a double cone insert, shallow hopper, loads and pressure, wall stress, a large scale silo, concentric filling, load measurement

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Triggering flow of jammed cohesive granular materials using modulated pulsed airflow

Zhu

Guo

et al. 2021

AIChE Journal

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Realizing the stable high-flux flow of cohesive granular materials is a complicated subject. We experimentally studied the dynamic characteristics of cohesive granular materials discharged from hopper under modulated pulsed airflow. Results show that pulsed airflow with a smaller duty cycle can effectively trigger the stable flow of jammed cohesive granular materials. Furthermore, under proper working conditions, the hopper flow will change from the classic arch breaking mode to a free flowing mode like liquid.The flow rate of the powder in the free flowing mode will decrease as powder bed height decreases, which overturns the consistent recognition. The oscillating shear provided by the pulsed airflow eliminates the Janssen effect and achieves a liquid-like stress transmission, which supports the above findings. Through energy analysis, we gave the scaling relationship between the pressure gradient and the pulse parameters to cover the experimental data and revealed the internal mechanism.

show abstract

The influence of a cone-in-cone insert on flow pattern and wall pressure in a full-scale silo

Cited by 55 publications

References 6 publications

Simulation of silo filling and discharge using ANSYS and comparison with experimental data

Simulation of silo filling and discharge using ANSYS and comparison with experimental data

Experimental Investigation of Load Exerted on a Double-Cone Insert and Effect of the Insert on Pressure Along Walls of a Large-Scale Axisymmetrical Silo

Triggering flow of jammed cohesive granular materials using modulated pulsed airflow

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