Table 1. Representative studies on passive drag‑reduction strategies. Data extracted from peer‑reviewed journals; drag‑reduction percentages refer to friction factor decrease at comparable Reynolds numbers.
[ \beginaligned \nabla \cdot \mathbfu &= 0,\ \rho \left( \frac\partial \mathbfu\partial t + \mathbfu\cdot\nabla\mathbfu \right) &= -\nabla p + \mu \nabla^2\mathbfu. \endaligned ] ladtboy tube
¹Department of Mechanical Engineering, University of X ²Institute for Microfluidic Technologies, Y Research Center ³Department of Applied Physics, Z University Table 1