G. Bobovnik, J. Kutin, N. Mole, B. Štok, I. Bajsić
A computational study of the installation effects in Coriolis flowmeters positioned downstream of different flow disturbance elements (a single elbow, closely coupled double elbows out-of-plane and an orifice) is presented. The mass-flow sensitivities are estimated using the results of a fully three-dimensional, coupled and partitioned numerical model that accounts for the fluid-structure interactions. The results show that the mass-flow sensitivity can vary for different circumferential positions of the motion sensors in a straight-tube full-bore meter. Because of flow splitters and the...
Dr Michael Reader-Harris, David Addison
This paper presents new data and shows that the existing drain-hole equation in ISO/TR 15377 is unsatisfactory: it leads to flowrate errors up to nearly 2% in magnitude. The data on drain holes have a surprisingly strong dependence on the circumferential location of the pressure tappings. However, a new analysis takes this into account and has produced a formula for d’, the corrected orifice diameter taking account of the drain hole. It is very desirable to amend ISO/TR 15377:2007.
Luhai Wang, Fengshou Xiao, Tao Li, Yujian Zhu, Jiming Yang, Jun Li, Shuilong Ma
Response of turbine flow meter in a vertical air-water two-phase flow is experimentally investigated. The flow field and the transient response of turbine are captured through a high speed camera, and the cross-sectional phase distribution is recorded by arrayed ERT. The experiment reveals that the rotational rate of the turbine drops when air intrudes into the rotor, and the relative fluctuation amplitude of the rotation decreases with the water flow. For the benefit of combined flow measurement with ERT and turbine meter, an extension to TG turbine performance model involving the...
E. von Lavante, S. Brinkhorst, A. Gedikli, H. Krisch
In the present investigation, a new design vortex flow meter with novel pressure detection chamber has been optimized and investigated numerically as well as experimentally. Instead of implementing the standard configuration with paddle for vortex detection, a pressure chamber of optimized size and position has been investigated, allowing much higher temperatures of the metered fluid. Whereas the standard design is limited to 240 °C, the new design allows temperature in access of 500 °C. The present paper describes the results of numerical simulation of the corresponding high temperature...
Valmir Ruiz, Marcos Tadeu Pereira,Nilson Massami Taira
The article presents the results of tests carried out in turbine meters to investigate the effects of different viscosities in the curves, and to explore mathematical ways to express the low flow rate part of the curves in order to use them as a functional part of the flow meter curve, with some loss of uncertainty, but even so useful in a number of cases. The turbine meters have diameters of 25 mm, 40 mm and 50 mm, and the tests were carried out with three different viscosities of fluids (7cSt, 17cSt and 34cSt).
Kristoffer Karlsson, Jerker Delsing
Measurements of the flow of gases and liquids are being performed routinely everywhere in the world. Be it air in a ventilation or gasoline trough a gas pump, flow measurements are an integral part of society. For most flow scenarios there are at least a couple of solutions how to perform the measurement with one or two of them being more advantageous depending on the situation. For example in some liquid flow measurements ultrasonic transducers are used to determine the flow through the time-of-flight method and in gas flows a venturi pipe might be used that determines the flow through...
Sejong Chun, Byung-Ro Yoon, Woong Kang, Hyu-Sang Kwon
Ultrasonic flow metering with clamp-on type transducers is a promising method when portability in flow metering is necessary. Nevertheless, the clamp-on ultrasonic flow meter has low measurement accuracy as flow speed in the pipe decreases. If the two types of clamp-on ultrasonic flow paths, namely, Z-shaped and V-shaped ultrasonic paths, are combined, measurement accuracy can be increased because the metering output becomes robust. In the present study, the measurement accuracy of the combined clamp-on ultrasonic flow meter was within ±2 % at 50 m 3 /h, which was smaller than those of the...
Takafumi Abe, Takuya Hayashi, Natsuya Kikawa, Daisuke Tsuruta, Toshiaki Kobayashi, Masaki Takamoto Takashi Shimada, Ryoji Doihara Yoshiya Terao
Feasibility study on a new type clump-on ultrasonic flowmeter with a carbon fiber reinforced plastic (CFRP) tube as a meter body is presented in the report. Recently, CFRP is widely used in transportation industry because of its excellent characteristics. Also, non-destructive inspection of CFRP is increasingly important for safety reason and one of the important methods is to detect microscopic defects by use of ultrasound. Characteristics of ultrasonic propagation in CFRP have been well investigated. The paper reports a new type clump-on ultrasonic flowmeter with CFRP by use of the...
G J Brown, B W Griffith
There are benefits, limitations and trade-offs to be taken in to account when considering using a flow conditioner with an ultrasonic meter. These include aspects such as the pressure loss, the risk of fouling and the influence on meter repeatability, as well as the ease and reproducibility of manufacturing. This paper discusses different flow conditioner designs and introduces a new design intended for use with 4-path ultrasonic flowmeters. Performance data and permanent pressure loss measurements are presented and compared with a commonly used form of perforated plate flow conditioner. It...
L. J. Huang, C. C. Chen Y. N. Liu, J. L. Ruan, W. H. Deng
Measurement of gas with high humidity or gas converted from liquid phase is frequently encountered. Accurate metering is always a challenging process as the remaining liquid vapors may significantly affect the performance of the measuring unit. In this paper, we presented a novel design of a mass flow meter which is utilizing a single MEMS calorimetric mass flow sensor chip integrated with a substrate micro-heating circuitry. The results indicated that the design can effectively work for the gas flow measurement under the presence of high humidity or liquid vapors with no requirement of...