Experimental study on drag reduction and anti-shearing characteristics of xanthan gum solution with NaCl
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摘要: 通过实验研究了添加氯化钠（NaCl）的黄原胶盐溶液（XG/NaCl）在直径为20mm的光滑圆管中的减阻及抗剪切特性，得到了不同质量分数黄原胶盐溶液的减阻率随流动雷诺数及运行时间的变化关系曲线，并与黄原胶水溶液（XG）的减阻特性及抗剪切特性进行了对比。结果表明：相比黄原胶水溶液，添加NaCl的黄原胶盐溶液减阻率随雷诺数的增大较快趋于稳定，但其减阻率在较低雷诺数下低于黄原胶水溶液的减阻率，在较高雷诺数下才明显高于黄原胶水溶液的减阻率，且存在减阻剂黄原胶与NaCl的最佳配比；黄原胶盐溶液具有较强的耐温性；在连续循环剪切作用下，不同质量分数的黄原胶盐溶液均具有较好的抗剪切特性。Abstract: Experimental study on the drag reduction and the anti-shearing characteristics of xanthan gum(XG) solution with NaCl addition in smooth pipes with diameter of 20mm was conducted. For different mass fractions of XG solution with NaCl addition(XG/NaCl solution), the relationships of the drag reduction efficiency with the flow Reynolds number and the shearing duration time were obtained and compared with the drag reduction and anti-shearing characteristics of XG solution. The results show that the drag reduction percentage of XG/NaCl solution tends to stabilize rapidly with increasing Reynolds number, and it is lower than that of the XG aqueous solution in the low Reynolds number regime, but significantly higher than that of XG aqueous solution in high Reynolds number regime. There exists a best ratio of XG to NaCl for the drag reduction. The XG/NaCl solution has good temperature resistance. In the process of continuous shearing of pump, different mass fractions of XG/NaCl solution all have high resistance to the mechanical degradation.
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图 2 不同质量分数黄原胶盐溶液和黄原胶水溶液减阻率随Re的变化曲线
Figure 2. Drag reduction rate vs. Re number for XG/NaCl solution and XG aqueous solution at different mass fractions
图 3 3种质量分数黄原胶盐溶液和黄原胶水溶液减阻率随Re变化的曲线对比
Figure 3. Drag reduction rate vs. Re number for XG/NaCl solution and XG aqueous solution for three different mass fractions
图 4 不同温度下的黄原胶盐溶液的沿程阻力系数随Re的变化曲线
Figure 4. The friction factor vs. Re number for XG/NaCl solution at different temperatures
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