Fluid Mechanics: Open Access

New avenues for low-cost point-of-care (POC) diagnostics have emerged thanks to centrifugal microfluidic platforms (CDs). They are now widely used in a variety of diagnostic procedures, including blood plasma separation, serial dilutions, and those requiring polymerase chain reaction steps. The use of CD microfluidic devices makes it possible to transfer a wide range of intricate processes that, in the past, required trained personnel and expensive individual laboratory equipment to the small disc platform. The CD fluidic platforms' portability, ease of use, integration, and robustness necessitate fluid flow control designs that are straightforward, dependable, and scalable.

The pore-scale behaviour of gas and water in rough-walled hydrophilic fractures is critical to understanding the gas production features of naturally fractured formations. In this study, the volume of fluid (VOF) approach is utilised to perform a systematic examination of gas and water flow characteristics in both single-fracture and Y-shaped junction fracture models. According to numerical simulations, the gas/water rate ratio altered the shape, phase distribution, and saturation of gas bubbles and slugs. The gas/water ratio has a bigger influence than fracture roughness and tortuosity, whereas total fluid rate has no effect. Because the channel aperture ratio alone controls the phase distribution and referential paths in Y-shaped junction models, the impact of the intersecting angle and fluid flow rate can be ignored.