基于CFD模拟的流体化学温度测量的最佳实践方法

IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Vanessa Nuredin, Lisa Schulz, Norbert Kockmann, Thorsten Röder
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引用次数: 0

摘要

实验室连续流过程中温度的精确测量对于许多研究,如传热或反应动力学,都是非常重要的。特别是,由于热传递增加,小型化对温度测量提出了很高的挑战。尽管这一主题具有很高的相关性,但只有很少的出版物涉及流动化学中精确的在线温度测量,并且没有研究检查温度传感器安装对实际测量温度的影响。这项工作涉及在线温度测量使用传统的Pt100传感器1.6毫米外径和20毫米的测量长度在一个t片连续流反应器在微尺度。在计算流体力学CFD模拟中说明了t形件的热损失问题。对t片温度和Pt100传感器在绝缘t片和未绝缘t片中测得的相应温度进行了仿真,并与实验数据进行了比较。此外,还对Pt100传感器的不同插入位置和方向进行了仿真和讨论。大量的CFD模拟表明,在绝缘t型件内使用Pt100的侧边位置可以实现最精确的温度测量。此外,研究表明,只要Pt100的测量部分完全插入,Pt100在t片内的倾斜对温度测量几乎没有影响。基于这些结果,提出了一种测量误差最小的微型连续流反应器在线温度测量的最佳实践方法。图形抽象
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Best practice approach for temperature measurement in flow chemistry based on CFD simulation

The exact measurement of the temperature in laboratory continuous flow processes is of high importance for many investigations e.g. of heat transfer or reaction kinetics. In particular, miniaturization poses high challenges on temperature measurement due to increased heat transfer. Despite the high relevance of this topic, there are only few publications dealing with accurate inline temperature measurement in flow chemistry and no studies examining the influence of the installation of the temperature sensor on the actual measured temperature. This work deals with inline temperature measurement using a conventional Pt100 sensor with 1.6 mm outer diameter and 20 mm measuring length in a T-piece in a continuous flow reactor on the micro-scale. The issue of heat loss in the T-piece is illustrated in a computational fluid dynamics CFD simulation. The T-piece temperature and the corresponding temperature measured by the Pt100 sensor in an insulated and not insulated T-piece are simulated and compared with experimental data. Moreover, different insert positions and orientations of the Pt100 sensor are simulated and discussed. The extensive CFD simulations demonstrate that using the side-on position of the Pt100 within an insulated T-piece leads to the most precise temperature measurements. Furthermore, the study shows that tilting of the Pt100 inside the T-piece has almost no influence on the temperature measurement as long as the measuring section of the Pt100 is fully inserted. Based on these results, a best practice approach for inline temperature measurement in micro-scale continuous flow reactors is presented for minimal measurement error.

Graphical Abstract

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来源期刊
Journal of Flow Chemistry
Journal of Flow Chemistry CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
6.40
自引率
3.70%
发文量
29
审稿时长
>12 weeks
期刊介绍: The main focus of the journal is flow chemistry in inorganic, organic, analytical and process chemistry in the academic research as well as in applied research and development in the pharmaceutical, agrochemical, fine-chemical, petro- chemical, fragrance industry.
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