Kai Peng, Changming Jiang, Yongyu Liu, Wenhong Deng, Xiang Lan, Sugang Jiang, Jack Xuan, Liji Huang
Cost effective flow meters are dominated by rotameters or variable area flow technology. These meters only measure instant volumetric flow rate with a low accuracy. In addition, the meters are not capable for temperature and pressure compensation as well as remote communication. With increasing demands on data communication and remote control in current industrial processes or gas measurement applications, development of new technologies would be necessary. We present a series of MEMS mass flow meters that are cost compatible with the variable area flow meters while providing all digital...
Jian Luo, Yenan Liu, Xiaoping Liao and Jiliang Ruan
The demands in homecare in North America and Europe have required cost effective disposable flow sensors for avoiding cross contamination and other damages. Examples are the infusion pumps and personal ventilators. For the infusion pump applications, a miniature liquid flow sensor is required to handle the micro flow during the injection of the medicine so that a constant injection can ensure the patient with ultimate comfort and prevention of side effects. This application also requires micro-fluidic design for the flow range of 0-500 mL/hr. A MEMS flow sensor designed with the extended...
Liji Huang
Since late 1970s, MEMS mass flow sensors have been emerged for gas mass flow measurement providing cost effective alternatives. However, unlike the other MEMS technology, MEMS mass flow sensor market grows at a very slow pace dominating only in automobile air mass flow sensing. The MEMS mass flow meters have been few since year 2000 and are limited to low flow speed applications in dry and clean gases due to the vulnerability in design and adversity for moisture and particles. Siargo since 2003 has been dedicated to provide its patented MEMS mass flow technology excelling for the traditional...
Xiao-xuan Cao, Yu-ming Shen
Put forward a way to use MATLAB when processing the image of the glass flowmeter in order to automatically get its float lever. In the process of image collection, we study the phenomenon of uneven background brightness that caused by illumination, and decide to use diffuse. First, we use MATLAB image processing toolbox, such as edge detection, filtering, thresholding, expansion, thinning, etc, and then add our own algorithms according to the specific image feature, to detect the float position.
Shao-feng Li, Xian-ju Meng, Zhi Li
This article study the correlation between flow coefficient and diameter error of upstream and downstream pipe for elbow meter used CFD simulation and experiments, the results of CFD simulation and experiments all show that the flow coefficient is significantly influenced by the diameter error, so the diameter error of upstream and downstream pipe muse be strictly controlled when the elbow meter is produced or used, or modify the flow coefficient, if error of diameter can be measured, to improve the measure accuracy in industrial applications.
I. D. Velt, S. I. Kuznetsov, N. V. Terekhina
The research problem of electromagnetic flowmeters metrological characteristics dependence on a velocity profile by a simulation method is considered. The simulating method of research of dependence of metrological characteristics of electromagnetic flowmeters on a velocity profile is considered.
Richard Fertell
Description of an international standard that ensures all liquid flow rate measurement technology specifications are consistent for evaluation and comparison as well as to document and advance the state-of-the-art of liquid flow rate measurement technologies. The standard will cover all liquid flow rate technologies, error sources, fluid and temperature applications, and expected measurement uncertainties.
I. D. Velt, Ju. V. Mikhailova, Yu. A. Tyurin
Electromagnetic flowmeters at which electric potential distribution to channel surfaces is controlled with using the foreign current brought to measuring electrodes are considered.
Julia Michailova, Pavel Frolov
The role of numerical simulations in new device development and optimization sensor properties is steadily increasing. Last years we observe dramatic increase of computational power of GPU based chips with double point precision. With using CUDA architecture process of adapting old numeric code for modern parallel architecture is greatly simplified. In contrast to the modern universal CPU chips graphics accelerators are designed for parallel computing with a large number of arithmetic operations. Steadily increasing number of transistors on GPU works for its intended purpose - processing of...
Zhang Qiang, Xu Ying, Zhang Tao
In order to measure the wet gas not separating, a wet gas measuring method based on double differential pressures of an alone venturi meter is presented in this study. In traditional over-reading (viz. OR) correlations, only the liquid phase fraction is known, can the OR be solved. This deficiency is analyzed by error propagation method theoretically. The change characteristics and the inherent physics laws of the differential pressures of the contraction and expansion sections of a venturi tube which were affected by the relative amount of liquid phase and gas flow rates were investigated...