MgSO₄·7H₂O deposits are investigated on steel (X5CrNi18-10) plates with different finishing qualities. At a supercooling temperature of 9 °C, these deposits are detected on all plates. Shear stress is found to have a noticeable influence on the incrustation phenomenon. In the range of investigated variables, it increases deposition and removal rates. These rates are the highest for mirror-like surface (plate I). On the other hand, the contact angle of solution has no clear impact on the process under investigation. Solution minimal shear stress preventing incrustation on the plates is also inspected. It is done experimentally and then by interpreting the plot of G_eff vs τ. Data analysis shows that simple surface parameters such as Ra, Rz, Rq, Sa, Sp, Sv, St, and Sq have no substantial influence on these values. On the contrary, more complex parameters like Sku and Ssk), which are measures of nonconventional finishing and sharpness profile shape, respectively, do have a significant effect. Additionally, the study examines the link between the crystal deposit mass and the Reynolds number, distinguishing four distinct zones. These variations between the zones are attributed to changes in the variables that affect fouling, which are influenced by fluctuations in the flow rate.

中文翻译：

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最小溶液剪切应力防止不锈钢板上MgSO4·7H2O结垢

研究了具有不同精加工质量的钢(X5CrNi18-10)钢板上的MgSO ₄ ·7H ₂ O沉积物。在 9 °C 的过冷温度下，所有板上都能检测到这些沉积物。发现剪切应力对结壳现象有显着影响。在研究的变量范围内，它提高了沉积率和去除率。对于镜面表面（板 I），这些比率最高。另一方面，溶液的接触角对所研究的过程没有明显的影响。还检查了防止板上结垢的最小剪切应力的解决方案。它是通过实验完成的，然后通过解释G _eff与 τ的关系图来完成。数据分析表明， Ra、Rz、Rq、Sa、Sp、Sv、St和Sq等简单表面参数对这些值没有实质性影响。相反，更复杂的参数（例如Sku和Ssk）（分别是非常规精加工和锐度轮廓形状的度量）确实具有显着影响。此外，该研究还检查了晶体沉积质量和雷诺数之间的联系，区分了四个不同的区域。区域之间的这些变化归因于影响污垢的变量的变化，这些变量受到流量波动的影响。