👉 The Stuart fluid, also known as Stuart-Brown-Schaefer fluid, is a viscous, non-Newtonian fluid commonly used as a model for biological fluids in laboratory settings. It is characterized by its shear-thinning properties, meaning its viscosity decreases with increasing shear rate, making it ideal for simulating the flow behavior of blood and other similar fluids. This fluid is composed primarily of water, with additives like polyethylene glycol (PEG) and glycerol to mimic the physiological conditions of blood, including its temperature and viscosity. Its unique rheological properties allow researchers to study complex fluid dynamics and interactions within the circulatory system, aiding in the development of medical treatments and diagnostic tools.