Ruiyang Liu , Liang Chen , Shufa Yan , Hanxuan Luo , Fengzhe Tian , Zhiwen Xie
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引用次数: 0
Abstract
Monitoring seepage by temperature tracer method has been widely used, where the vertical flow has been proven to be an indispensable factor. However, current research still lacks adequate consideration of it, especially for the natural convection caused by active heating. In this paper, theoretical derivation and experiments are both conducted, a two-dimensional dimensionless temperature rise–seepage velocity formula considering the natural convection is derived. Meanwhile, through the experiment system and a multi-temperature measuring sheets device, heating and temperature measurement experiments are carried out under calm water and various flow velocities ranging from 10−6 cm s−1 to 10−3 cm s−1. By comparing the temperature–time curves of different positions at different heating times in calm water, the mechanism of natural convection caused by active heating is researched. Based on this, several temperature measuring sheets are chosen, the formulas of different positions are obtained by fitting, relative influence to temperature rise–flow velocity patterns of different positions are studied. This study is of great significance for further understanding the temperature-velocity relationship, and for the design of heating-temperature measuring device used in seepage velocity monitoring with active heating.
温度示踪法监测渗流已得到广泛应用，其中垂直流动已被证明是一个不可或缺的因素。然而，目前的研究仍然没有充分考虑到这一点，特别是对主动加热引起的自然对流。本文通过理论推导和实验，推导了考虑自然对流的二维无因次温升-渗流速度公式。同时，通过实验系统和多测温片装置，在静水和10−6 cm s−1 ~ 10−3 cm s−1不同流速下进行加热和测温实验。通过比较静水中不同加热时间下不同位置的温度-时间曲线，研究主动加热引起自然对流的机理。在此基础上，选择了几种测温片，通过拟合得到了不同位置的计算公式，研究了不同位置对温升-流速模式的相对影响。该研究对于进一步认识温度-速度关系，以及设计主动加热渗流速度监测中所用的加热-测温装置具有重要意义。
期刊介绍：
Flow Measurement and Instrumentation is dedicated to disseminating the latest research results on all aspects of flow measurement, in both closed conduits and open channels. The design of flow measurement systems involves a wide variety of multidisciplinary activities including modelling the flow sensor, the fluid flow and the sensor/fluid interactions through the use of computation techniques; the development of advanced transducer systems and their associated signal processing and the laboratory and field assessment of the overall system under ideal and disturbed conditions.
FMI is the essential forum for critical information exchange, and contributions are particularly encouraged in the following areas of interest:
Modelling: the application of mathematical and computational modelling to the interaction of fluid dynamics with flowmeters, including flowmeter behaviour, improved flowmeter design and installation problems. Application of CAD/CAE techniques to flowmeter modelling are eligible.
Design and development: the detailed design of the flowmeter head and/or signal processing aspects of novel flowmeters. Emphasis is given to papers identifying new sensor configurations, multisensor flow measurement systems, non-intrusive flow metering techniques and the application of microelectronic techniques in smart or intelligent systems.
Calibration techniques: including descriptions of new or existing calibration facilities and techniques, calibration data from different flowmeter types, and calibration intercomparison data from different laboratories.
Installation effect data: dealing with the effects of non-ideal flow conditions on flowmeters. Papers combining a theoretical understanding of flowmeter behaviour with experimental work are particularly welcome.
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