变黏度流体降膜流动数值模拟策略及应用

IF 3.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Wenxu Yuan, Wenxing Chen, Shichang Chen
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引用次数: 0

摘要

将基于平均年龄理论的年龄输运方程和可设计年龄-粘度公式纳入Navier-Stokes方程,采用一种新的模拟策略对大范围变粘度降膜的流动行为进行了模拟。令人惊讶的是,发现了一个转弯区域,其中变粘度降膜厚度随流量和初始粘度的变化是相反的。流量越大或初始粘度越高,转捩区长度越长,且沿流动方向离进口越远。提出了一种流动截面粘度来解释这种异常。然后,通过流动截面粘度分析,得到了基于出口粘度计算初始粘度的模拟方案和降膜管长度设计的经验方程。为降膜反应器的设计、放大和工艺优化提供了实用参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Numerical Simulation Strategy and Applications for Falling Film Flow with Variable Viscosity Fluids

Numerical Simulation Strategy and Applications for Falling Film Flow with Variable Viscosity Fluids
The flow behaviors for falling film with wide-range variable viscosity were demonstrated by a neosimulation strategy, which incorporated the age transport equation based on mean age theory and a designable age-viscosity formula into Navier–Stokes equations. Surprisingly, a turning region was revealed, in which the thickness variation for variable viscosity falling film with the flow rate and initial viscosity was reversed. The larger the flow rate or the higher the initial viscosity, the longer the length of the turning region, and further, it was from the inlet along the flow direction. A flow cross-sectional viscosity was proposed to explain this anomaly. Then, a simulation scheme for calculating the initial viscosity based on outlet viscosity and an empirical equation for designing the length of the falling film pipe could be achieved according to flow cross-sectional viscosity analysis. It provided a practical reference for falling film reactor design, scale-up, and process optimization.
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来源期刊
Industrial & Engineering Chemistry Research
Industrial & Engineering Chemistry Research 工程技术-工程:化工
CiteScore
7.40
自引率
7.10%
发文量
1467
审稿时长
2.8 months
期刊介绍: ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.
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