Evaluating the Caking Strength of Powders

Tanaka, Tatsuo

doi:10.1021/i360067a013

Cited by 28 publications

(14 citation statements)

References 5 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mechanical strength of solid bridges depends not only on temperature, humidity and pressure, but it depends also on the mass transfer, the solubility of the powder in water and the number of contact points, i.e. on the coordination number of particles in the powder bed 3) . A schematic representation of the adsorption of water molecules followed by capillary condensation and dissolution of the solid phase is proposed in Fig.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Dissolution and Recrystallization of Sodium Chloride at Controlled Relative Humidity

Langlet

Nadaud

Bénali

et al. 2011

KONA

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Kinetics of Dissolution and Recrystallization of Sodium Chloride at Controlled Relative Humidity

Langlet

Nadaud

Bénali

et al. 2011

KONA

View full text Add to dashboard Cite

show abstract

“…An equation for the radius of the solid bridge can be found in Tanaka [18] where n b is the volume of the bridge for a single particle around the contact area between two particles, R is the radius of the particle, and b is the radius at the narrowest part of the bridge. The volume n b can be calculated by tracking changes in the moisture content of the solids during a wetting/ drying cycle.…”

Section: Modelling Of Moisture Migration Cakingmentioning

confidence: 99%

Application of simulation technologies in the analysis of granular material behaviour during transport and storage

Chapelle

Christakis

Wang

et al. 2005

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

Problems in the preservation of the quality of granular material products are complex and arise from a series of sources during transport and storage. In either designing a new plant or, more likely, analysing problems that give rise to product quality degradation in existing operations, practical measurement and simulation tools and technologies are required to support the process engineer. These technologies are required to help in both identifying the source of such problems and then designing them out. As part of a major research programme on quality in particulate manufacturing computational models have been developed for segregation in silos, degradation in pneumatic conveyors, and the development of caking during storage, which use where possible, micro-mechanical relationships to characterize the behaviour of granular materials. The objective of the work presented here is to demonstrate the use of these computational models of unit processes involved in the analysis of large-scale processes involving the handling of granular materials. This paper presents a set of simulations of a complete large-scale granular materials handling operation, involving the discharge of the materials from a silo, its transport through a dilute-phase pneumatic conveyor, and the material storage in a big bag under varying environmental temperature and humidity conditions. Conclusions are drawn on the capability of the computational models to represent key granular processes, including particle size segregation, degradation, and moisture migration caking.

show abstract

“…Preliminary calculations also found that the rate of enthalpy changes generated from these processes were negligible compared to the heat transfer involved in temperature cycling (the rate of heat generated from condensation on the sugar particles was 0.0003 W compared to the rate of heat transfer due to conduction of 24 W). From this the radius at the narrowest part of the bridge (the neck) b, can be calculated thus [3]:…”

Section: Background and Theorymentioning

confidence: 99%

“…With these simplications this could then be developed into Rumpf's equation for the tensile strength of agglomerates formed from monosized particles [3][4][5] thus:…”

Section: Background and Theorymentioning

confidence: 99%

Measuring the tensile strength of caked sugar produced from humidity cycling

Leaper

Berry

Bradley

et al. 2003

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

The aim of this study was to develop moisture migration modelling in stored sugar due to the temperature cycling of the storage environment. This was done by forming cake of sugar in a gas-bearing tensile tester. The sugar and tester were enclosed in a controlled humidity system and the relative humidity was cycled between four hours at 70 per cent relative humidity and four hours at 20 per cent relative humidity. Liquid bridges formed between the sugar particles at high relative humidity, with the bridges hardening subsequently when the humidity was reduced. It was found that the relationship between the tensile strength and number of cycles could be approximated by the relationship s TˆK ƒ ƒ ƒ ƒ N p and the agglomerate tensile strength was in the order of 150 Pa after 32 cycles. This suggests a soft cake rather than hard cakes with a tensile strength of twice this order of magnitude, which are formed, for example, in salt. A value of 1300 kPa was obtained for the parameter representing the average strength of the bridge material in a simpli ed model of monosized spheres linked by pendular bridges in a system of uniform packing.

show abstract

Evaluating the Caking Strength of Powders

Cited by 28 publications

References 5 publications

Kinetics of Dissolution and Recrystallization of Sodium Chloride at Controlled Relative Humidity

Kinetics of Dissolution and Recrystallization of Sodium Chloride at Controlled Relative Humidity

Application of simulation technologies in the analysis of granular material behaviour during transport and storage

Measuring the tensile strength of caked sugar produced from humidity cycling

Contact Info

Product

Resources

About