  Lubricated textured surfaces immersed in liquid flows offer tremendous
potential for reducing fluid drag, enhancing heat and mass transfer, and
preventing fouling. According to current design rules, the lubricant must
chemically match the surface to remain robustly trapped within the texture.
However, achieving such chemical compatibility poses a significant challenge
for large-scale flow systems, as it demands advanced surface treatments or
severely limits the range of viable lubricants. In addition, chemically tuned
surfaces often degrade over time in harsh environments. Here, we demonstrate
that a lubricant-infused surface (LIS) can resist drainage in the presence of
external shear flow without requiring chemical compatibility. Surfaces
featuring longitudinal grooves can retain up to 50% of partially wetting
lubricants in fully developed turbulent flows. The retention relies on
contact-angle hysteresis, where triple-phase contact lines are pinned to
substrate heterogeneities, creating capillary resistance that prevents
lubricant depletion. We develop an analytical model to predict the maximum
length of pinned lubricant droplets in microgrooves. This model, validated
through a combination of experiments and numerical simulations, can be used to
design chemistry-free LISs for applications where the external environment is
continuously flowing. Our findings open up new possibilities for using
functional surfaces to control transport processes in large systems.
