Diañez Amores, IsabelMartinez García, InmaculadaJerez, AbelFranco Gómez, José María2024-12-182024-12-182024-12Diañez, I., Martínez, I., Jerez, A., & Franco, J. M. (2024). Low-cost rolling ball viscometer for the evaluation of Newtonian and shear-thinning fluids. In Applied Rheology (Vol. 34, Issue 1). Walter de Gruyter GmbH. https://doi.org/10.1515/arh-2024-00211617-8106https://hdl.handle.net/10272/24698This article describes the design and testing of a low-cost automatic rolling-ball viscometer. The device has been manufactured from three-dimensional printed parts and conventional and affordable mechanical and electronic components. It is controlled by an Arduino MEGA with a custom code that includes manual and automatic measuring modes. Both the type of viscometer and the models used are, in principle, valid for Newtonian and power-law fluids. However, measurement and calculation procedures have been developed that also makes it possible to determine the viscosity of Herschel–Bulkley fluids that might exhibit a yield stress behaviour within the range studied. By these procedures, viscosity values have been obtained for model fluids – Newtonian, power-law, and Herschel–Bulkley fluids – and compared to those obtained with a commercial rotational rheometer. The proposed setup and measuring method have thus proven to provide very reasonably accurate viscosity values for a low-cost deviceengAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/ViscometerRolling-ballLow-costAutomaticPower-lawHerschel–Bulkleyjournal article10.1515/arh-2024-0021open access23 Química