快速混合在整个凝固过程中非常重要。直列喷射混合器是一种高效的快速混合装置，其构造和操作成本较低。讨论了与侧向射流混合有关的文献，导出了描述中心射流快速混合最佳条件的解析关系式。对之前提出的集中喷射射流设计程序进行了改进，将速度比和直径比作为设计变量。包括明矾混凝系统快速混合步骤的一个示例问题。作者的结论是，速度比和直径比都应被视为设计变量- 直线喷射喷射混合器。小直径比的最佳条件的特点是动量比为常数，而大直径比的最佳动量比不是常数，取决于直径比。包括26个参考文献、表格和图表。

Rapid mixing is important in the overall process of coagulation. In-line jet injection blenders are efficient rapid-mix units that are inexpensive to construct and operate. Literature pertinent to the mixing of a side jet is discussed, and analytical relationships describing optimum conditions for rapid mixing of central jets are derived. A previously proposed design procedure for centrally injected jets is refined to include velocity ratio and diameter ratio as design variables. An example problem is included for the rapid-mix step of an alum coagulation system. The authors conclude that both the velocity ratio and the diameter ratio should be considered as design variables in the design of in-line jet injection blenders. Optimum conditions for small diameter ratios are characterized by a constant value for the momentum ratio, whereas the optimum momentum ratio for large diameter ratios is not a constant and depends on the diameter ratio. Includes 26 references, table, figures.