Fundamental study on flow measurement of extremely small flow rates of a liquid.

Igarashi, Tamotsu; Inagaki, Susumu; Nishida, Kouzou

doi:10.1299/kikaib.56.719

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All such correlations to our knowledge are listed in Tables I and II together with the two correlations we have newly prepared as described below. Several correlations given in other forms (Wilkinson, 1972;Babu, 1987; Igarashi et al, 1990) are excluded from the scope of this paper.…”

Section: Specification Of the Backgroundmentioning

confidence: 99%

Formulation of the Harkins-Brown correction factor for drop-volume description

Zhang¹,

Mori²

1993

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Section: Specification Of the Backgroundmentioning

confidence: 99%

Formulation of the Harkins-Brown correction factor for drop-volume description

Zhang¹,

Mori²

1993

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

“…Many image analysis methods using highspeed video pictures have been reported for measuring drop formation [6][7][8]. There are also reports of measuring the mass of 100 drops using a precision balance and determining the mass of one drop [9]. In addition, much research is being conducted in the field of eye drop bottles [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A study on the change of droplet volume by the increase of flow rate

Horiuchi

2020

SN Appl. Sci.

View full text Add to dashboard Cite

Drip-control type infusion pumps cause a flow rate error when the volume of the droplet dropping in the drip chamber changes. Therefore, the purpose of this study is to accurately measure the volume of one droplet as the flow rate increases. For measurement of droplet volume, a droplet bypassing device was prototyped. In the case of a 20 drop/mL drip nozzle, a volume error of + 7.6% occurred at a flow rate of 500 mL/min, compared to the theoretical volume of 50.0 mm 3. In the case of a 60 drop/mL drip nozzle, a volume error of − 17.4% occurred at a flow rate of 300 mL/min, compared to the theoretical volume of 16.7 mm 3. Moreover, the standard deviation of the measured value of the droplet volume increased as the flow rate increased. It was shown that even with proper use of the infusion set, significant flow rate errors can occur depending on the flow rate settings. Therefore, it is considered that the drip-control type infusion pump needs to be controlled by correcting the volume change due to the increase in the flow rate.

show abstract

Dynamics of falling droplet and elongational properties of dilute nonionic surfactant solutions with drag-reducing ability

2017

View full text Add to dashboard Cite

The dynamics of the falling droplet through a nozzle for dilute nonionic surfactant (oleyl-dimethylamine oxide, ODMAO) aqueous solutions with viscoelastic and drag-reducing properties were investigated at different concentrations of ODMAO solutions Cs = 500, 1000, and 1500 ppm by weight. The effects of the flow rate and tube outer diameter on the length of the filament, which was the distance between the tube exit and the lower end of a droplet at the instant when the droplet almost detached from the tube, were clarified by flow visualization measurements by a high-speed video camera. Two types of breaking-off processes near the base of the droplet and within the filament were classified by the Ohnesorge number Oh and the Weber number We. In the regime of the higher Oh and We, the length of the filament became drastically larger at Cs = 1000 and 1500 ppm, whose high spinnability represented the strong viscoelasticity of ODMAO solutions. In the case where the filament was broken up near the lower end of the neck and thinning in time, the thinning of the diameter of the filament was measured by a light-emitting diode micrometer. As for the elasto-capillary thinning of dilute nonionic surfactant solutions, the initial necking process was similar to that of Newtonian fluids and then followed the exponential thinning like polymer solutions. The apparent elongational viscosity of the dilute nonionic surfactant solution was evaluated in the elasto-capillary thinning regime, in which the elongation rate was almost constant. At Cs = 1000 and 1500 ppm, the Trouton ratio, which was the ratio of the apparent elongational viscosity to the shear viscosity, was found to be several orders of magnitude larger than that of Newtonian fluids, while the shear viscosity measured by the capillary viscometer was almost the same order of the Newtonian fluids. The higher elongational property would be closely related to the higher drag-reducing ability of dilute nonionic surfactant solutions.

show abstract

Fundamental study on flow measurement of extremely small flow rates of a liquid.

Cited by 3 publications

References 0 publications

Formulation of the Harkins-Brown correction factor for drop-volume description

Formulation of the Harkins-Brown correction factor for drop-volume description

A study on the change of droplet volume by the increase of flow rate

Dynamics of falling droplet and elongational properties of dilute nonionic surfactant solutions with drag-reducing ability

Contact Info

Product

Resources

About