Squeeze flow of concentrated suspensions of spheres in Newtonian and shear-thinning fluids

Collomb, J.; Chaari, Fahmi; Chaouche, Mohend

doi:10.1122/1.1645514

Cited by 36 publications

(31 citation statements)

References 14 publications

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“…For a power-law composite fl uid in squeeze fl ow, an expression for Pe is provided(see Equation 4). 10,11 The indication is that for a given material, decreasing the  H will decrease Pe and increase the propensity for an onset of fl ow-induced segregation at increased values of H, i.e. for the formation of a microstructure of pillars (Figure 1c).…”

Section: Introductionmentioning

confidence: 97%

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The effect of filler-network heterogeneity on thermal resistance of polymeric thermal bondlines

Rae

Børgesen

Cotts

2011

JOM

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How would you……describe the overall significance of this paper? Insight is provided on how to fabricate thermal bondlines so as to maximize thermal conductance, by manipulating filler particles arrangements. Thermal bondlines provide thermal links between heat generating components and heat sinks.…describe this work to a materials science and engineering professional with no experience in your technical specialty? Although it is recognized that the thermal resistance of a thermal bondline is not a material property, little work has been focused on how to vary processing parameters in order to minimize thermal resistance. This works focuses on optimizing such assembly processes for thermal interface bondlines in order to segregate particles into particular regions, and maximize thermal conductance.…describe this work to a layperson? You could fry an egg on the processor of your computer while it is running gaming software for you. Such heat needs to be removed in order to avoid processor malfunction. Bolting on a small radiator does not quite do it; one needs some type of filled, thermal paste between the two in order to fill small gaps and get the heat out. For the most effective solution, the exact speed at which you squeeze such a thermal paste must be controlled.The influence of processing on filledpolymeric bondline microstructure and thermal performance was examined. Cu/thermal interface material/ Cu trilayers were assembled with a viscously applied, adhesive thermal interface material with Ag filler particles. It was found that decreasing the squeeze rate used for bondline formation from 10 to 0.1 µm/s resulted in a change in the microstructure from fairly homogeneous (homogeneous at 50 µm length scales and above) to one with marked segregation of many filler particles into highly compacted structures spanning the bondline thickness. A three-fold increase in effective thermal conductivity was correlated with this microstructure change. Significant changes in microstructure resulted when the compressive force (300N) used to form the bondline was removed before the bondline structure was stabilized by a cure operation and a four fold increase in the thermal resistance of such bondlines was observed.

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Section: Introductionmentioning

confidence: 97%

“…1,2,5-10 This process driven heterogeneity occurs when the rate of polymer flow through the filler particles is greater than the rate of deformation of the composite fluid. More formal scaling arguments [9][10][11] have been previously presented for the onset of self filtration in axisymmetric squeeze flows of paste-like materials.…”

Section: Introductionmentioning

confidence: 99%

The effect of filler-network heterogeneity on thermal resistance of polymeric thermal bondlines

Rae

Børgesen

Cotts

2011

JOM

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“…Actually, the squeeze-flow is a widely used rheometry technique, which has been applied for food, pharmaceuticals, polymer composites, ceramic pastes, and other concentrated suspensions [26][27][28][29][30]. Its use is becoming more frequent as an alternative/complementary method for cement-based pastes [16,31,32] and mortars [33][34][35][36][37], especially to simulate flow situations associated to geometric restrictions (extrusion, spreading, brick laying, flow through a nozzle during pumping or spraying).…”

Section: Introductionmentioning

confidence: 99%

“…Its use is becoming more frequent as an alternative/complementary method for cement-based pastes [16,31,32] and mortars [33][34][35][36][37], especially to simulate flow situations associated to geometric restrictions (extrusion, spreading, brick laying, flow through a nozzle during pumping or spraying). The geometry change inherent to the method can induce liquid-solid phase separation, because the liquid may flow radially outwards through the porous structure of packed particles (filtration or drainage), thus having a substantial influence on the squeeze-flow behaviour of concentrated suspensions [27][28][29][30][32][33][34][35][36]. The occurrence and intensity of phase separation depend on material characteristics (liquid viscosity and permeability of packed particles) and test parameters, mainly speed and gap [27][28][29][30][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Parallel-plate rotational rheometry of cement paste: Influence of the squeeze velocity during gap positioning

Cardoso

Fujii

Pileggi

et al. 2015

Cement and Concrete Research

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“…Por isso, para avaliar alguns fenômenos de maneira isolada é interessante reduzir a quantidade de fatores que influenciam o fluxo do material. Dessa forma, diversos pesquisadores utilizaram suspensões formadas por fluidos com comportamento mais simples, como óleo ou silicone, e esferas de vidro para simular macropartículas em estudos com reômetros (FERRARIS et al, 2016;KOEHLER;FOWLER, 2004;SAKANO, 2016) e squeeze flow (COLLOMB;CHAARI;CHAOUCHE, 2004;DELHAYE;POITOU;CHAOUCHE, 2000;NIKKHOO et al, 2013). Com materiais de referência mais homogêneos e com características bem definidas, a influência de alguns parâmetros sobre o comportamento reológico é minimizada ou mesmo evitada (reatividade, efeito de forças superficiais e morfologia de partículas), e, adicionalmente, problemas de amostragem e mistura são reduzidos, o que melhora a repetibilidade dos resultados e possibilita uma resposta mais clara do fenômeno de interesse.…”

Section: Introductionunclassified

Comportamento reológico em squeeze flow de suspensões concentradas de esferas de vidro em silicones de diferentes viscosidades

et al. 2018

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Resumo Squeeze flow é uma das principais técnicas para analisar o comportamento reológico de argamassas. Esses materiais podem ser considerados como suspensões concentradas, reativas e heterogêneas com grande extensão granulométrica, nas quais o comportamento reológico é influenciado pelas quantidades e características de seus constituintes. Para avaliar alguns fenômenos de maneira mais detalhada, é interessante reduzir os fatores que influenciam o fluxo. Assim, este trabalho avalia o comportamento reológico de suspensões concentradas de esferas macroscópicas de vidro em fluidos newtonianos de diferentes viscosidades (silicones: 100, 1.000 e 10.000 cSt) e visa analisar a interação entre as fases líquida e sólida e a ocorrência de segregação. As suspensões com 60% e 70% em volume de sólidos foram submetidas a ensaios de squeeze flow com diferentes velocidades. O aumento da quantidade de fluido altera os principais fenômenos relacionados ao fluxo: com baixo volume de líquido o atrito entre as partículas, a capacidade de lubrificação do fluido e a coesão decorrente da formação de meniscos são predominantes na suspensão, enquanto em suspensões com volume de líquido suficiente para afastar as partículas a viscosidade do fluido, a força de arraste e a permeabilidade do sistema granular influenciam no comportamento reológico e na ocorrência de separação de fases.

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Squeeze flow of concentrated suspensions of spheres in Newtonian and shear-thinning fluids

Cited by 36 publications

References 14 publications

The effect of filler-network heterogeneity on thermal resistance of polymeric thermal bondlines

The effect of filler-network heterogeneity on thermal resistance of polymeric thermal bondlines

Parallel-plate rotational rheometry of cement paste: Influence of the squeeze velocity during gap positioning

Comportamento reológico em squeeze flow de suspensões concentradas de esferas de vidro em silicones de diferentes viscosidades

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