2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/105258In channel flows a step on the route to turbulence is the formation of streaks, often due to algebraic growth of disturbances. While a variation of viscosity in the gradient direction often plays a large role in laminar-turbulent transition in shear flows, we show that it has, surprisingly, little effect on the algebraic growth. Non-uniform viscosity therefore may not always work as a flow-control strategy for maintaining the flow as laminar.9 pages, 8 figuresFluid DynamicsOther Condensed MatterSoft Condensed Mattertext