A simple accurate method for measuring viscosity of liquid metals at high temperatures

Elahi, S. Hossein; Adelnia, H.; Shahverdi, Hamid Reza

doi:10.1122/1.4709431

Cited by 9 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Between these two methods, falling ball viscometer is superior for measuring viscosity of composite liquids and slurries. 23 Moreover, it generates a fluid flow around itself 25 which works similar to a mixer and gives the ability to distribute the oxide products during measuring viscosity. This ability provides stable melt oxidation by supplying new melt under the surface.…”

Section: Selecting An Appropriate Methodsmentioning

confidence: 99%

“…But, due to high melting points, chemical reactivity, and low viscosity values of liquid metals, specially designed techniques are needed; therefore, only a few methods are suitable for measuring rheological properties of melts. [18][19][20][21] Capillary, oscillating vessel, rotational bob or crucible, oscillating plate, draining vessel, levitation using damping of surface oscillations, acoustic methods, 18,19 high temperature electrostatic levitation, 22 and falling ball viscometer 23 have been developed or modified for this purpose.…”

Section: Selecting An Appropriate Methodsmentioning

confidence: 99%

See 1 more Smart Citation

A new method for investigating oxidation behavior of liquid metals

Elahi

Abdi

Shahverdi

2014

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

A novel method was introduced to investigate oxidation behavior of melts in different conditions such as flux, alloying element, atmosphere, etc. This approach was based on rheology properties of melts, in which by tracing viscosity variations during oxidation, the behavior of melt can be explored. A modified falling ball viscometer was proposed and used for viscometry. Oxidation of aluminum and Al-Mg alloys was studied using this method. According to the results, it was found that this method was not only a proper approach for investigating oxidation behavior but also could be used as a compliment along conventional approaches.

show abstract

Section: Selecting An Appropriate Methodsmentioning

confidence: 99%

Section: Selecting An Appropriate Methodsmentioning

confidence: 99%

A new method for investigating oxidation behavior of liquid metals

Elahi

Abdi

Shahverdi

2014

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

show abstract

“…Owing to its simplicity, ease of operation, and its low cost, the falling ball method is a well-established technique for measuring the viscosity of Newtonian fluids under ambient conditions as well as at elevated temperatures and pressures, for example, see References [6][7][8][9] for a broad spectrum of applications of the FBM. Furthermore, Brizard et al, [10,11] Sutterby [12] have discussed detailed designs, various corrections and the precision of the viscosity values for Newtonian fluids obtained by this method.…”

Section: Newtonian Fluidsmentioning

confidence: 99%

“…Thus, all that required is the falling sphere data be obtained in the constant viscosity region for the system of interest. Though this range is not known a priori, one can obtain data with a few spheres (different size and/or density) to calculate the value of η using Equation (6) to check whether the resulting values of η are identical to each other within the margin of experimental uncertainty. Scaling arguments suggest the shear rate to be of the order of (V/d) and indeed, for a Newtonian fluid, the local value of _ γ rθ ranges from 0 to (3 V/d) on the surface of the sphere yielding the surface mean value of (2 V/d).…”

Section: Newtonian Fluidsmentioning

confidence: 99%

Falling ball method for determining zero shear and shear‐dependent viscosity of polymeric systems: Solutions, melts, and composites

Suri

Patel

Chhabra

2022

Vinyl Additive Technology

View full text Add to dashboard Cite

The falling ball method (FBM) is one of the well‐established techniques for measuring the viscosity of Newtonian liquids at the room as well as at elevated temperatures and pressures. Owing to its simplicity and low cost, the possibility of extending its range of application to non‐Newtonian systems including virgin and filled polymer melts, composites, polymer‐solutions, and so forth, is explored here, In this work, theoretical results for the flow of power‐law fluids past a sphere have been used to extract the values of the zero‐shear viscosity and shear‐dependent viscosity in the low‐shear rate limit. The theoretical scheme outlined here has been validated by presenting comparisons with experimental results for scores of polymer solutions for which both falling sphere and rheological data are available in the literature. Indeed, the good correspondence obtained between these two independent data is encouraging and it is thus possible to use the FBM for shear‐thinning systems when the resulting Reynolds numbers are such that the flow is viscosity‐dominated, and the inertial effects are negligible. This implies that the Reynolds number should be ≤ ~1 for shear‐thinning fluids and ≤ ~10−5 for shear‐thickening fluids.

show abstract

“…In this article, a newly invented falling ball viscometer by the authors [13] was used to measure the viscosity of high temperature molten metal. Independency of viscosity measurement of stirring is one of the advantages of this method.…”

Section: Introductionmentioning

confidence: 99%