Study of the Flow of Dilute Polymer Solution through a Small Orifice and of the Measurement of Elongational Stress

Watanabe, Hiroshi; Hasegawa, Tomiichi; Narumi, Takatsune; Hirai, Yasuyuki; Tanabe, Katsutoshi

doi:10.1678/rheology1973.26.1_21

Cited by 3 publications

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“…The distribution of velocity ν z along the channel center line, [ν z ] r = 0 , was also obtained from the same LDV data as those used for Figure 4. The results and the [ν z ] r = 0 − z plots thus obtained show that the region of z/d on the center line, where ν z has a considerable value, extends much higher than that of the Newtonian fluid,6 and grows upward with time. Consequently, the angle of the flow region surrounded by the vortex, wherein the fluid is flowing toward the capillary entry, decreases with time.…”

Section: Resultsmentioning

confidence: 63%

“…The development of the velocity vector field corresponding to the photographs in FIGURE 3 is shown in FIGURE 4. The distribution of velocity v z along the channel center line, [v z ] r = 0 , was also obtained from the same LDV data as those used for where v z has a considerable value, extends much higher than that of the Newtonian fluid, 6 and grows upward with time. Consequently, the angle of the flow region surrounded by the vortex, wherein the fluid is flowing toward the capillary entry, decreases with time.…”

Section: Transient Behavior Of the Paa-solutionmentioning

confidence: 99%

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Start‐up Behavior of Viscoelastic Fluid Flow Near a Capillary Entry

Shirakashi

Takahashi

Watanabe

et al. 2002

Annals of the New York Academy of Sciences

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The effect of elasticity on the capillary entry flow development process was investigated by applying a laser doppler velocimeter (LDV) and flow visualization. The fluid filling the test section was kept at rest under a pressure of compressed air or a natural head and then a valve below the capillary was quickly opened to start the flow. Although the development of the capillary entry flow field of a Newtonian fluid is virtually quasi-steady, it takes a considerable time for a viscoelastic PAA-solution to attain its terminal regime. The transient behavior of the flow rate of the PAA-solution is attributed to the gradual development process of the flow field upstream from the entry.

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Section: Resultsmentioning

confidence: 63%

Section: Transient Behavior Of the Paa-solutionmentioning

confidence: 99%

Start‐up Behavior of Viscoelastic Fluid Flow Near a Capillary Entry

Shirakashi

Takahashi

Watanabe

et al. 2002

Annals of the New York Academy of Sciences

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Simple Apparatus Based on the Jet Reaction Method for Measuring Elasticity of Liquids.

Asama

Hasegawa

Narumi

2001

J. Soc. Rheol., Jpn

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Measurement of the elastic stress of viscoelastic fluids at high strain rates is important in industry, but hard for conventional rheometers. We have developed a new type of apparatus based on the jet reaction method for measuring the elastic stress. The new apparatus is smaller in size and simpler in treatment than the one that has been used so far. Load test of the apparatus and comparison with the other apparatuses reveal that the present apparatus has a confidence in measurement of elastic stress at high strain rates. In this paper, we present several kinds of data measured in shear flow and elongational flow by the present apparatus.

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Experimental Study of Non-Newtonian Fluids

Hasegawa

2007

J. Soc. Rheol., Jpn

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This report is described mainly about the measuring methods developed and results obtained by the author on the elasticity in water flow and dilute polymeric liquid flow at high strain rates: Jet thrust/reaction was measured for the flow through capillaries or orifices of small size and the elastic stress was calculated and the thrust/reaction was found to decrease significantly both for polymeric liquid flow accompanied with vortices upstream of the orifice and for water flow through micro-orifices. Elongational stress estimated using the measured thrust/reaction was revealed to be correlated with the flow velocity through orifices. This suggests that these fluids posses a property of elastic solid, not of viscoelastic liquid, under the present experimental condition. It was also shown that the pressure drop of the water flow through micro-orifices is much reduced and this was again explained by the elasticity. The model of elastic fluid possessing only elastic property without viscosity was proposed, Bernoulli's theorem was extended to the one including the elastic property, and several experimental phenomena characteristic of viscoelastic fluids were explained by this extended theorem. Additionally, the property of vortices for polymeric liquids was discussed.

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Study of the Flow of Dilute Polymer Solution through a Small Orifice and of the Measurement of Elongational Stress

Cited by 3 publications

References 0 publications

Start‐up Behavior of Viscoelastic Fluid Flow Near a Capillary Entry

Start‐up Behavior of Viscoelastic Fluid Flow Near a Capillary Entry

Simple Apparatus Based on the Jet Reaction Method for Measuring Elasticity of Liquids.

Experimental Study of Non-Newtonian Fluids

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