Concentrated solutions of guar gum in water (1000–3000 ppm) with and without KCl salt (1000–4000 ppm) were injected near the wall for a short period (2.5 min) to investigate their effect on drag reduction in turbulent flow of water through a pipe (Re ≈ 17000–45000). Relative to bulk solution, the concentrations of polymer and salt were 50–150 ppm and 50–200 ppm, respectively. A drag reduction of 71.45% was observed for 3000 ppm of biopolymer without salt. Guar gum experienced mechanical degradation under high shear conditions and addition of KCl improved shear stability up to 47% (for Re ≈ 45000). A polymer concentration of 3000 ppm and salt concentration of 2000 ppm in the injection fluid were found to be optimum for achieving the highest drag reduction with better shear stability. Results indicated that boundary layer injection shows better drag reduction ability than pre-mixed solutions.

将瓜尔胶在水中（1000–3000  ppm）和（或不添加）KCl盐（1000–4000  ppm）的浓缩溶液短时间（2.5 分钟）注入壁附近，以研究其对减少湍流中水阻力的影响。一个管（再 ≈  17000-45000）。相对于本体溶液，聚合物和盐的浓度分别为50-150  ppm和50-200  ppm。对于 不含盐的3000ppm生物聚合物，观察到减阻为71.45％。瓜尔豆胶经历的机械降解在高剪切条件下和加入氯化钾改进的剪切稳定性高达47％（用于重新 ≈  45000）。聚合物浓度为3000  ppm，盐浓度为2000 发现注射液中的ppm对于实现最大减阻和更好的剪切稳定性而言是最佳的。结果表明，边界层注入显示出比预混合溶液更好的减阻能力。