In order to clarify the relation between the enhanced erythrocyte sedimentation rate in an inclined vessel and the medium upflow underneath the downward‐facing wall of the vessel, we have measured the upflow velocity V along the vessel length y and the width δ of the upflow layer at tilt angles θ of 10°, 20°, 40°, and 60°. Sample was a swine erythrocyte suspension at nonaggregated state at the volume fraction of 0.2. Polystyrene latex particles with 1‐μm diameter were mixed in the suspension to visualize the motion in the upflow layer. Observations were made with a video system under an invert microscope at room temperature. The upflow layer began to be formed immediately after the sample injection, and reached to the steady state within 10 min, while keeping a thin layer. The time for reaching the steady state decreased with increasing θ. The upflow velocity was much higher by two to three orders of magnitude than the sedimentation rate. Both V and δ increased with increasing θ. The observed velocity profiles were represented by the reduced equation 1−V/Vmax=(1−x/δ)2 as predicted by the Acrivos and Herbolzheimer theory. Here, x is a coordinate taken along the end line at the bottom of the vessel.
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Dissertation|
May 01 1993
Erythrocyte sedimentation phenomena I: Tilt angle dependence of upflow velocity in inclined vessel
Yoshiharu Toyama;
Yoshiharu Toyama
Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University, Kiryu, Gunma 376, Japan
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Atsuko Idonuma;
Atsuko Idonuma
Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University, Kiryu, Gunma 376, Japan
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Toshiaki Dobashi;
Toshiaki Dobashi
Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University, Kiryu, Gunma 376, Japan
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Akio Sakanishi
Akio Sakanishi
Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University, Kiryu, Gunma 376, Japan
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J. Rheol. 37, 567 (1993)
Citation
Yoshiharu Toyama, Atsuko Idonuma, Toshiaki Dobashi, Akio Sakanishi; Erythrocyte sedimentation phenomena I: Tilt angle dependence of upflow velocity in inclined vessel. J. Rheol. 1 May 1993; 37 (3): 567. https://doi.org/10.1122/1.550432
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