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• W2580597002 endingPage "e0170826" @default.
• W2580597002 startingPage "e0170826" @default.
• W2580597002 abstract "Random Positioning Machines (RPMs) are widely used as tools to simulate microgravity on ground. They consist of two gimbal mounted frames, which constantly rotate biological samples around two perpendicular axes and thus distribute the Earth's gravity vector in all directions over time. In recent years, the RPM is increasingly becoming appreciated as a laboratory instrument also in non-space-related research. For instance, it can be applied for the formation of scaffold-free spheroid cell clusters. The kinematic rotation of the RPM, however, does not only distribute the gravity vector in such a way that it averages to zero, but it also introduces local forces to the cell culture. These forces can be described by rigid body analysis. Although RPMs are commonly used in laboratories, the fluid motion in the cell culture flasks on the RPM and the possible effects of such on cells have not been examined until today; thus, such aspects have been widely neglected. In this study, we used a numerical approach to describe the fluid dynamic characteristic occurring inside a cell culture flask turning on an operating RPM. The simulations showed that the fluid motion within the cell culture flask never reached a steady state or neared a steady state condition. The fluid velocity depends on the rotational velocity of the RPM and is in the order of a few centimeters per second. The highest shear stresses are found along the flask walls; depending of the rotational velocity, they can reach up to a few 100 mPa. The shear stresses in the bulk volume, however, are always smaller, and their magnitude is in the order of 10 mPa. In conclusion, RPMs are highly appreciated as reliable tools in microgravity research. They have even started to become useful instruments in new research fields of mechanobiology. Depending on the experiment, the fluid dynamic on the RPM cannot be neglected and needs to be taken into consideration. The results presented in this study elucidate the fluid motion and provide insight into the convection and shear stresses that occur inside a cell culture flask during RPM experiments." @default.
• W2580597002 created "2017-02-03" @default.
• W2580597002 creator A5003737733 @default.
• W2580597002 creator A5047717101 @default.
• W2580597002 creator A5059411184 @default.
• W2580597002 creator A5073026391 @default.
• W2580597002 date "2017-01-30" @default.
• W2580597002 modified "2023-10-10" @default.
• W2580597002 title "Fluid Dynamics Appearing during Simulated Microgravity Using Random Positioning Machines" @default.
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• W2580597002 doi "https://doi.org/10.1371/journal.pone.0170826" @default.
• W2580597002 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5279744" @default.
• W2580597002 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28135286" @default.
• W2580597002 hasPublicationYear "2017" @default.
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