Thermal mass flow meter

About: Thermal mass flow meter is a research topic. Over the lifetime, 1759 publications have been published within this topic receiving 21878 citations.

Measurement of oil-water flow via the correlation of turbine flow meter, gamma ray densitometry and drift-flux model

Abstract: The flow rate of the oil-water horizontal flow is measured by the combination of the turbine flow meter and the single-beam gamma ray densitometry. The emphasis is placed on the effects of the pipe diameter, the oil viscosity and the slip velocity on the measurement accuracy. It is shown that the mixture flow rate measured by the turbine flow meter can meet the application requirement in the water continuous pattern (o-w flow pattern). In addition, by introducing the developed drift-flux model into the measurement system, the relative errors of measurements for component phase flow rates can be controlled within +/- 5%. Although more accurate methods for the flow rate measurement are available, the method suggested in this work is advantageous over other methods due to its simplicity for practical applications in the petroleum industry.

Experimental and Numerical Investigation of Gravity-Driven Pipe Flow With Cavitation

Abstract: Gravity driven pipe flows contain no risk of pump failure and are considered to be reliable even under accident conditions However, accurate prediction methods are only available for single phase flow In case of the occurrence of two-phase flow (caused eg by boiling or cavitation), a considerable reduction in mass flux can be observed In this study, an experimental and numerical investigation of gravity driven two-phase pipe flow was performed in order to understand and model such flows An experiment was conducted to analyse gravity driven flow of water near saturation temperature in a complex pipe consisting of several vertical and horizontal sections The diameter was 100 mm with a driving height of 13 m between an elevated tank and the pipe outlet The experiment shows that cavitation leads to formation of steam The two-phase character of the flow causes a significant reduction of mass flux in comparison to a single phase flow case The experimental flow rate was reproduced by one dimensional single and two phase flow analysis based on standard one dimensional methods including models for steam formation The main part of this study consists of a three dimensional CFD analysis of the two phase flow A three dimensional model for cavitation and recondensation phenomena based on thermal transport processes was developed, implemented and validated against our experimental data Due to the fact that beside bubbly flow, also the stratified and droplet flow regimes occur, a new approach to model phase interaction terms of the Two-Fluid Model for mass, momentum and energy is presented Thereby, the transition from one flow regime to another is taken into account The experimental mass flow rate can be predicted with an accuracy of 10% The three dimensional analysis of the flow situation demonstrates the influence of pipe elements such as horizontal and vertical sections, bends and valves of the pipe on the mass flux and the steam distribution The analysis of secondary flows in bends emphases their importance for the steam distribution within the pipe, for the pressure loss and the average mass fluxCopyright © 2002 by ASME

Minimally intrusive monitoring of a multiphase process flow using a tracer

Abstract: An apparatus for and a method of monitoring multiphase fluid flow passing within a pipe is provided. The method includes the steps of: a) providing a flow pressure value and a flow temperature value for the multiphase fluid flow within the pipe; b) sensing the fluid flow with a fluid flow meter operable to be attached to an exterior of the pipe, the flowmeter including a spatial array of at least two sensors disposed at different axial positions along the pipe, and producing flow velocity signals indicative of a velocity of the fluid flow traveling within the pipe; c) selectively injecting at least one tracer into the fluid flow passing within the pipe, at a known injection flow rate and concentration; d) sensing a sample of the fluid flow for the tracer, and producing tracer concentration signals indicative of the concentration of the tracer in the fluid flow; and e) determining one or more of a gas component flow rate, an oil component flow rate, and a water component flow rate, using one or more of the flow pressure value, the flow temperature value, the flow velocity signals, and the tracer concentration signals.

Coriolis mass flow meter with two drivers

Abstract: In a coriolis flow meter, two drivers are provided and a measure of mass flow rate derived from the adjustment of the input signals to each driver required to achieve a desired phase shift in the output. This may give higher accuracy compared to conventional meters in which the phase shift is simply measured, and may also enable determination of other characteristics of the fluid.