A simple capillary viscometer based on the ideal gas law

Abstract

Fluid viscosity proportional to pressure drop in a capillary (L) was reflected by the air–fluid interface displacement (ΔL) to enclosed air.

Viscosity of hydrogen and methane blends: experimental and modelling investigations

“…In transient conditions, one of the physical parameters that gives detailed information about a fluid's molecular interaction is viscosity 6 . It determines the fluid's resistance to flow.…”

“…Adequate understanding of the viscosity of hydrogen and methane blends is vital for predictions of the mixture properties in chemical processes, geological formations, and pipeline activities such as pumps and compressors [6][7][8][9] . Technically, transport models provide quick computation of parameters that aid understanding of behaviours of hydrogen blends.…”

Go with the flow: deep learning methods for autonomous viscosity estimations

“…Capillary viscometers relate viscosity to the time taken for a fluid to discharge through a capillary tube and can operate on a microlitre scale, achieving accuracies of 2 percent with as little as 20 μL of fluid. 13 However, microfluidic viscometers typically require extensive cleaning 14 and can suffer from chip degradation or obstruction of the channels. 15 Likewise, high-throughput rotational viscometer platforms exist, 16 but they are usually expensive, and samples often need to be reformatted to be presented to the instrument.…”

Probing mutual interactions between Pseudomonas aeruginosa and Candida albicans in a biofabricated membrane-based microfluidic platform

“…Microfluidics has the advantage of adaptive integration with microscopy and easy handling of fluids in small volumes. Engineered microfluidic platforms have been demonstrated to be outstanding in analytical performance 23 as static gradient generators, 24,25 fluidic parameter measuring devices, 26,27 and point of care testing devices. 28,29 The application of microfluidics in studying polymicrobial biology has been vastly developed with the capability of studying mutual interactions at single cell level, 30 as multispecies biofilm reactor, 31 or as spatially defined microbial consortia.…”