Evaluation of the inkjet fluid’s performance using the “Cambridge Trimaster” filament stretch and break-up device

Vadillo, Damien; Tuladhar, T. R.; Mulji, A. C.; Jung, Sungjune; Hoath, Stephen D.; Mackley, M. R.

doi:10.1122/1.3302451

Cited by 101 publications

(118 citation statements)

References 35 publications

Supporting

Mentioning

108

Contrasting

Order By: Relevance

“…Although the breakup of the plasma filament looks similar to that of a Newtonian fluid, the thin tails close to the top and bottom plates, indicated by the arrow in Figure 4b1 and 4b2, suggest a slight viscoelastic behavior of human plasma. A similar filament shape was observed in the filament thinning and breakup of weakly elastic fluids, in which the formation of a tail indicates that viscoelasticity acts against the breakup by increasing the breakup time [36,37]. Nevertheless, the very weak viscoelastic character of human plasma seen here contrasts with previous observations of Brust et al [19].…”

Section: Figcontrasting

confidence: 57%

Rheological behavior of human blood in uniaxial extensional flow

Sousa

Vaz

Cerejo

et al. 2018

Journal of Rheology

View full text Add to dashboard Cite

We present an investigation of the rheological behavior of whole human blood under uniaxial extensional flow. For that purpose, capillary breakup experiments were carried out by combining the slow retraction method, high-speed imaging techniques and an immiscible oil bath. The use of the oil bath was aimed at reducing liquid loss by evaporation and to reduce light refraction effects, thus allowing the visualization of the blood cells during the filament thinning. Extensional relaxation times were measured for whole blood samples collected from a total of thirteen healthy adult volunteers from both genders, with hematocrit levels between 38.7% and 46.3%. For this range of red blood cell concentrations, the variation of the extensional relaxation time is small, with the average extensional relaxation times measured in air and in oil being 11430 s and 25947 s, respectively. An increase of the red blood cells concentration leads to an increase of the bulk viscosity of the sample, which delays the thinning of the filament and consequently the time to breakup. In addition, blood aging was found to reduce the relaxation time while the absence of anticoagulant increases it significantly.2

show abstract

Section: Figcontrasting

confidence: 57%

Rheological behavior of human blood in uniaxial extensional flow

Sousa

Vaz

Cerejo

et al. 2018

Journal of Rheology

View full text Add to dashboard Cite

show abstract

“…Therefore, the initial experimental filament stretch strain rate was calculated to be 76 s -1 for the experiments in this chapter. Vadillo et al (2010) reported that measurement of extensional viscosity was independent of the initial filament stretch strain rate of the experiment.…”

Section: Background To Extensional Deformation Calculationsmentioning

confidence: 99%

Understanding the Rheological Parameters of Thickened Fluids for Dysphagia Sufferers

Hadde¹

View full text Add to dashboard Cite

An abnormality of swallowing food or fluid, known as dysphagia is a major issue throughout the world. Thickened fluids are commonly used in the medical management of individuals who suffer dysphagia, allowing for better oral and pharyngeal coordination and increasing the cohesiveness of the fluid. This reduces the risk of aspiration associated with bolus fracture while swallowing. Thickened fluids have been used for many years in healthcare centres and at home to provide nutrition and hydration to individuals with dysphagia. However, it is not always easy to obtain the correct consistency of thickened fluids. Fluids that are too thin may result in pneumonia, while over-thickened fluids may result in aspiration due to residue possibly inhaled from pharyngeal stasis. Variabilities in the consistency of thick fluids can be due to type of thickeners, solid content, serving temperature and differences in dispersing media.In Australia the consistency of thickened fluids is routinely assessed by evaluating their flow characteristics through a fork. This method is subjective. Although, several more reliable measuring devices are available to measure the thickness of the fluid, these devices are not suitable for the application of dysphagia management. For example, a rheometer can be used to accurately measure the viscosity of the fluid, but this device is not affordable for the healthcare industry. In contrast, the Line Spread Test is an affordable device to measure the thickness of the fluid, but the current investigation found it was potentially unreliable as many factors may influence the results of the measurement.A study of the rheological and material property characteristics of thickened fluids is needed to understand the behaviour of these fluids to allow patients to receive a consistent level of thickened fluids. The development of objective measurement guidelines for the three levels of thickened fluids for the Australian National Standards and a suitable measuring technique is also needed. This project therefore had three main objectives: (a) to rheologically characterise the behaviour of thickened fluids, considering a wide range of thickeners, fluids and serving conditions, (b) to determine which rheological parameter(s) are important for the application of dysphagia management, and (c) to obtain design guidelines for a reliable, inexpensive measuring device to accurately measure the relevant rheological parameter(s) of thickened fluids for the application of dysphagia management.The rheological properties of thickened fluids were examined in shear deformation to observe the effect of temperature, pH, fluid components (e.g. protein, fat and minerals) and type of thickener on the rheological parameters of thickened fluids. The rheological properties of thickened fluids across four available commercial thickener products and a range of types of fluids were iii | P a g e characterised and compared. Studies confirmed significant variabilities in rheological parameters between thickener products and disp...

show abstract

“…ROJER or other related capillary-thinning methods for extensional rheometry (such as CaBER or modified versions of CaBER [38][39][40], exploit the dynamics of the Rayleigh-Plateau instability and often rely on optical devices such as high-speed/strobe cameras, lenses and bright field illumination strategies to record the evolution in the filament diameter with time. A liquid thread with a known initial radius R that is connected at both ends to hemispherical liquid reservoirs (as in either of the ROJER/CaBER configurations) experiences higher capillary pressures inside the filament neck compared to the pressure in the hemispherical reservoirs.…”

Section: B Limits Of Rojermentioning

confidence: 99%

“…Knowing the limits of the commercial CaBER instrument when measuring the extensional rheology of dilute solutions, several extensions and alternate protocols have been introduced in the literature. The Slow Retraction Method (SRM) 38 and Cambridge Trimaster 39,40 are devices similar to CaBER that also utilize capillary thinning but show a substantial improvement in the range of measured elongational relaxation times (down to s E ' 80 ls). A more recent approach 7 has reintroduced an old concept based on studying the capillary breakup of a thin viscoelastic liquid jet.…”

Section: Introductionmentioning

confidence: 99%

Micro-scale extensional rheometry using hyperbolic converging/diverging channels and jet breakup

Keshavarz

McKinley

2016

Biomicrofluidics

View full text Add to dashboard Cite

Understanding the elongational rheology of dilute polymer solutions plays an important role in many biological and industrial applications ranging from microfluidic lab-on-a-chip diagnostics to phenomena such as fuel atomization and combustion. Making quantitative measurements of the extensional viscosity for dilute viscoelastic fluids is a long-standing challenge and it motivates developments in microfluidic fabrication techniques and high speed/strobe imaging of millifluidic capillary phenomena in order to develop new classes of instruments. In this paper, we study the elongational rheology of a family of dilute polymeric solutions in two devices: first, steady pressure-driven flow through a hyperbolic microfluidic contraction/expansion and, second, the capillary driven breakup of a thin filament formed from a small diameter jet (D j $ Oð100 lmÞ). The small length scale of the device allows very large deformation rates to be achieved. Our results show that in certain limits of low viscosity and elasticity, jet breakup studies offer significant advantages over the hyperbolic channel measurements despite the more complex implementation. Using our results, together with scaling estimates of the competing viscous, elastic, inertial and capillary timescales that control the dynamics, we construct a dimensionless map or nomogram summarizing the operating space for each instrument. Published by AIP Publishing. [http://dx

show abstract

Evaluation of the inkjet fluid’s performance using the “Cambridge Trimaster” filament stretch and break-up device

Cited by 101 publications

References 35 publications

Rheological behavior of human blood in uniaxial extensional flow

Rheological behavior of human blood in uniaxial extensional flow

Understanding the Rheological Parameters of Thickened Fluids for Dysphagia Sufferers

Micro-scale extensional rheometry using hyperbolic converging/diverging channels and jet breakup

Contact Info

Product

Resources

About