Journal of Japanese Society of Biorheology

Journal of Japanese Society of Biorheology

Online ISSN : 2186-5663
Print ISSN : 0913-4778
ISSN-L : 0913-4778

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Volume 11, Issue 2

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[title in Japanese]

[in Japanese], [in Japanese]

1997 Volume 11 Issue 2 Pages 1-5
Published: June 30, 1997
Released on J-STAGE: February 12, 2014

DOIhttps://doi.org/10.11262/jpnbr1987.11.2_42

JOURNAL FREE ACCESS

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[title in Japanese]

[in Japanese], [in Japanese]

1997 Volume 11 Issue 2 Pages 6-14
Published: June 30, 1997
Released on J-STAGE: February 12, 2014

DOIhttps://doi.org/10.11262/jpnbr1987.11.2_47

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[title in Japanese]

[in Japanese]

1997 Volume 11 Issue 2 Pages 15-20
Published: June 30, 1997
Released on J-STAGE: February 12, 2014

DOIhttps://doi.org/10.11262/jpnbr1987.11.2_56

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[title in Japanese]

[in Japanese]

1997 Volume 11 Issue 2 Pages 21-34
Published: June 30, 1997
Released on J-STAGE: February 12, 2014

DOIhttps://doi.org/10.11262/jpnbr1987.11.2_62

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[title in Japanese]

[in Japanese]

1997 Volume 11 Issue 2 Pages 35-44
Published: June 30, 1997
Released on J-STAGE: February 12, 2014

DOIhttps://doi.org/10.11262/jpnbr1987.11.2_76

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese]

1997 Volume 11 Issue 2 Pages 45-52
Published: June 30, 1997
Released on J-STAGE: February 12, 2014

DOIhttps://doi.org/10.11262/jpnbr1987.11.2_86

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[title in Japanese]

[in Japanese], [in Japanese]

1997 Volume 11 Issue 2 Pages 53-61
Published: June 30, 1997
Released on J-STAGE: February 12, 2014

DOIhttps://doi.org/10.11262/jpnbr1987.11.2_94

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Hemodilution

[in Japanese]

1997 Volume 11 Issue 2 Pages 62-71
Published: June 30, 1997
Released on J-STAGE: February 12, 2014

DOIhttps://doi.org/10.11262/jpnbr1987.11.2_103

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Effects of red blood cell aggregation and sedimentation on the tube hematocrit

Tadayoshi Murata

1997 Volume 11 Issue 2 Pages 72-79
Published: June 30, 1997
Released on J-STAGE: February 12, 2014

DOIhttps://doi.org/10.11262/jpnbr1987.11.2_113

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The effects of red cell aggregation and sedimentation on the tube hematocrit are investigated theoretically using a simple flow model. This model consists of a cell-free layer in the upper part of the tube and a concentrated red cell suspension in the bottom part of the tube divided by a smooth and horizontal interface. It is assumed that the concentrated red cell suspension in the bottom part is a Newtonian whose viscosity increases exponentially with hematocrit. The ratio of the tube hematocrit HT to the discharge hematocrit HD is obtained as a function of a relative width of a cell-free layer in the upper part of the tube to the tube diameter. The ratio HT/HD is also expressed as a function of pseudo-shear rate using a relationship between the width of cell-free layer and pseudo-shear rate obtained by experiments of Reinke et al.. It is suggested that the shear dependence of the ratio HT/HD can be qualitatively explained by using the model and that the ratio HT/HD becomes larger than unity in the range of low shear rates.

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A study on the resonance of sputum plug in the airway oscillation

Norio Tarao

1997 Volume 11 Issue 2 Pages 80-85
Published: June 30, 1997
Released on J-STAGE: February 12, 2014

DOIhttps://doi.org/10.11262/jpnbr1987.11.2_121

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With reference to the asymmetrical two-dimensional stenosis model used in my previous paper, a mathematical model for the evaluation of the efficiency on the resonant amplitude of the oscillation of the plug of sputum has been presented. The viscous property of the sputum is assumed to obey the Casson fluidity which was introduced to represent the non-Newtonian blood flow. Using the symbols as [A=height of the plug; l=the width; R=l/A; ρ=density of the sputum: T=the surface tension: E=the elasticity; fc=the yield stress; ηc=viscosity of the sputum at a very high shear rate; r=radius of the airway; ωR=the angular frequency of the oscillation of the plug at resonance; PX=amplitude of the oscillation of the pressure gradient; A_PR= the amplitude at resonant amplitude of the oscillation of the plug], the results have become clear as follows.

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