Journal
JOURNAL OF BIOMECHANICS
Volume 41, Issue 7, Pages 1436-1449Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2008.02.025
Keywords
scaffold; optimized microstructure; CFD analysis
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The application of in vitro cultured cells in tissue engineering or drug screening, aimed at complex soft tissues such as liver, requires in vivo physiological function of the cultured cells. For this purpose, the scaffold in which cells are cultured should provide a microenvironment similar to an in vivo one with a three-dimensional extracellular matrix, a high supply capacity of O-2 and nutrients, and high cell density. In this paper, we propose a method to design (1) the geometry of the scaffold, with a surface/volume ratio optimized to allow high-density (5 x 10(7) cells/mL) cell culture and (2) culture conditions that will supply optimal quantities of oxygen and nutrients. CFD modeling of mass transport was used to determine the shear stress as well as 0, and glucose metabolism in the scaffold (20mm width-35mm length) for various flow rates. Validation of the model was done through comparison with flow resistance and micro-PIV experiments. CFD analysis showed the maximum metabolic rate densities for this scaffold are 6.04 x 10(-3) mol/s/m(3) for O-2 at 0.71 mL/min and 1.91 X 10(-2) mol/s/m(3) for glucose at 0.35 mL/min. (c) 2008 Elsevier Ltd. All rights reserved.
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