From Newtonian to non-Newtonian fluid: Insight into the impact of rheological characteristics on mineral deposition in urine collection and transportation.
From Newtonian to non-Newtonian fluid: Insight into the impact of rheological characteristics on mineral deposition in urine collection and transportation.
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从牛顿流体到非牛顿流体：洞察流变特性对尿液收集和运输中矿物质沉积的影响。
DOI：
10.1016/j.scitotenv.2022.153532
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Jian Zhang
中科院分区：
文献类型：
--
作者：
Zhengxu Yan;Zifu Li;Shikun Cheng;Xuemei Wang;Lingling Zhang;Lei Zheng;Jian Zhang
磷基矿物固体在尿分流系统中的沉积一直是尿源分离的大规模实际应用的主要挑战之一。尿液流变特性的准确表征对尿液的实际流动性能具有重要意义。采用窄缝旋转流变仪测定了尿液的流变学数据。根据现有的管流理论和尿浆的流变数据，确定了过渡速度。研究了固体浓度和温度对尿液流变行为的影响。在低固相浓度下，尿液呈牛顿流体。而尿浆则随着固相浓度的增加由牛顿流体向非牛顿流体转变，表现出剪切变稀和屈服应力流体的特征。温度对尿浆表观粘度的影响采用Arrhenius型函数进行描述。此外，定量分析了固相浓度和温度对过渡速度的影响，结果表明，尿液在压缩沉降区的非牛顿行为对管道流动行为有显著影响，导致管道底部形成压缩层.有针对性地了解过渡速度对实际尿液管道系统的设计和优化，特别是如何减轻管道堵塞特别有用。在对不同管道系统进行评价的基础上，提出了几种可能的尿液收集和输送方式。
The deposition of phosphorus-based mineral solids in urine diversion systems has been one of the main challenges for the large-scale practical applications of urine source separation. Accurate rheological characterization of urine slurry is of high importance for its practical flow performance. The rheological data of urine slurry was obtained using a narrow gap rotating rheometer. Based on current pipe flow theories and the obtained rheological data of urine slurry, the transition velocity was determined. The impacts of solid concentration and temperature on the rheological behavior of urine slurry were investigated in this study. Urine slurry behaved as a Newtonian fluid at low solid concentration. By contrast, urine slurry changed from Newtonian to non-Newtonian fluid with the increase in solid concentration, demonstrating a shearing thinning behavior and yielding stress fluid. The impact of temperature on the apparent viscosity of the urine slurry was described using an Arrhenius-type function. Moreover, the impact of solid concentration and temperature on the transition velocity was quantified, which indicated that the non-Newtonian behavior of the urine slurry in the compression settling region has a significant impact on the pipe flow behavior, leading to the formation of a compressed layer on the bottom of the pipe. The targeting understanding of transition velocity is particularly useful for the practical design and optimization of urine piping system, especially on how to mitigate pipe blockages. Based on the evaluation of different piping systems, this work proposed several potential urine collection and transportation modes.