We measured the Fahraeus effect of blood flowing in a sheet flow model formed with two glass slides. The number of red blood cells in the sheet flow was counted to determine a sheet hematocrit Hs and the discharge hemotocrit Hd was measured from blood collection. For a Hd in the range of 3 to 30 percent, we find that Hs/Hd is about .83 for a gap of 4.1 μm. When the discharge hematocrit is 30 percent, the ratio decreases to .66 as the gap approaches 7 μm and then increases as the gap becomes thicker. The results indicate that the hematocrit ratio for a gap thicker than 4.1 μm is an increasing function of the discharge hematocrit. The value of Hs/Hd found for the sheet flow models and its dependence on Hd are comparable to those of circular tubes when their diameter equals the gap thickness.
The Fahraeus Effect in Sheet Flows With a Gap Thickness of 4 to 36 μm
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Deng, L. H., Wu, Y. P., Wang, G. R., Yang, R. F., and Lee, J. S. (February 1, 1989). "The Fahraeus Effect in Sheet Flows With a Gap Thickness of 4 to 36 μm." ASME. J Biomech Eng. February 1989; 111(1): 32–36. https://doi.org/10.1115/1.3168336
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