Systematic measuring errors of pulsating flow rates using ultrasonic phase flowmeters

1976 ◽  
Vol 19 (8) ◽  
pp. 1152-1155
Author(s):  
A. A. Ivanov ◽  
V. A. Reshetnikov
Keyword(s):  
Pulsating Flow ◽  
Flow Rates ◽  
Systematic Measuring

scholarly journals Computational study of a radial flow turbine operates under various pulsating flow shapes and amplitudes

2021 ◽  
pp. 1-24
Author(s):  
Ahmed Rezk ◽  
Sidharath Sharma ◽  
S.M. Barrans ◽  
Abul Kalam Hossain ◽  
P. Samuel Lee ◽  
...  
Keyword(s):  
Mass Flow ◽  
Radial Flow ◽  
Pulsating Flow ◽  
Gradual Change ◽  
Maximum Mass ◽  
Flow Rates ◽  
Flow Accumulation ◽  
Wide Range ◽  
Mass Flow Rates ◽  
The Impact

Abstract Radial flow turbines are extensively used in turbocharging technology due to their unique capability of handling a wide range of exhaust gas flow. The pulsating flow nature of the internal combustion engine exhaust gases causes unsteady operation of the turbine stage. This paper presents the impact of the pulsating flow of various characteristics on the performance of a radial flow turbine. A three-dimensional computational fluid dynamic model was coupled with a one-dimensional engine model to study the realistic pulsating flow. Applying square wave pulsating flow showed the highest degree of unsteadiness corresponding to 92.6% maximum mass flow accumulation due to the consecutive sudden changes of the mass flow rates over the entire pulse. Although saw-tooth showed a maximum mass flow accumulation value of 88.9%, the mass flow rates entailed gradual change resulted in the least overall mass flow accumulation over the entire pulse. These two extremes constrained the anticipated performance of the radial flow turbine operates under realistic pulsating flow. Such constraints could develop an operating envelop to predict the performance and optimize radial flow turbines' power extraction under pulsating flow conditions.

A Review of the Work of J. L. Hodgson on the Measurement of Pulsating Flow

1970 ◽  
Vol 3 (8) ◽  
pp. T125-T140 ◽  
Author(s):  
K. J. Zanker
Keyword(s):  
Pulsating Flow ◽  
Pressure Differential ◽  
Practical Application ◽  
Flow Meters ◽  
Flow Rates ◽  
Unpublished Work

Both the published and unpublished work of Hodgson on the measurement of pulsating flow rates by means of pressure differential devices is dealt with. Such situations are governed by the Hodgson number H0 = (CF/q) (L/p). The derivations, significance and practical application of the Hodgson number are discussed. Also considered briefly are other types of flow meters developed by Hodgson that were less affected by pulsating flows.

Theoretical, Numerical, and Experimental Study on an Unsteady Venturi Flowmeter for Incompressible Flows

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Izuru Kambayashi ◽  
Donghyuk Kang ◽  
Naoki Nishimura
Keyword(s):  
Flow Rate ◽  
Dynamic Characteristics ◽  
Energy Equation ◽  
Incompressible Flows ◽  
Euler Method ◽  
Pulsating Flow ◽  
Systematic Research ◽  
Flow Rates ◽  
Wide Range ◽  
Venturi Flowmeter

Abstract To examine the dynamic characteristics of turbomachinery and cavitation, the pulsating flow rates should be evaluated. As it is difficult to measure these pulsating flow rates quantitatively, systematic research has not been conducted on the dynamic characteristics of turbomachinery and cavitation. In this paper, an unsteady energy equation for a venturi tube has been proposed to measure pulsating flow rates. The pulsating flow rates were calculated using two methods based on the unsteady energy equation for incompressible flows. The first method calculated a pulsating flow rate by using the Euler method. The second one calculated the complex amplitude of a pulsating flow rate using a transfer function derived from the linearized unsteady energy equation. We analytically examined the order of magnitude for unsteady terms. The results indicated that the unknown unsteady loss was much smaller than the unsteady momentum. In the experiment, pulsating flows were generated by a reciprocating piston, and the given pulsating flow was measured using a hot wire anemometer. The pulsating flow rates evaluated by using the proposed methods were validated via numerical simulation and experiment. In particular, the influence of amplitudes on the evaluation of pulsating flow rates was numerically examined. Therefore, the nonlinear effect could be evaluated by using the proposed method, and the time-averaged loss coefficient was enough to evaluate the pulsating flow rate coefficient. The proposed unsteady venturi flowmeter can be applied to a wide range of research fields, such as analyzing dynamic characteristics of flows.

Real Time Measurement for High Frequency Pulsating Flow Rate in a Pipe

1990 ◽  
Vol 112 (4) ◽  
pp. 762-768 ◽  
Author(s):  
Tong Zhao ◽  
K. Sanada ◽  
A. Kitagawa ◽  
T. Takenaka
Keyword(s):  
Flow Rate ◽  
High Frequency ◽  
Time Measurement ◽  
Differential Pressure ◽  
Pulsating Flow ◽  
Electronic Circuits ◽  
Flow Rates ◽  
Real Time Measurement ◽  
Wide Range ◽  
Transformation Methods

Two kinds of analog transformation methods for the measurement of high frequency pulsating flow rates in pipe flow are investigated. By use of the methods, the high frequency pulsating flow rates can be obtained by feeding differential pressure or centerline velocity to analog electronic circuits. First, the frequency characteristics of the electronic circuits for the measurement are examined by experiments. Then a criterion for determining the measurement distance of the differential pressure is derived analytically in order to ensure the required accuracy of the measurement when the flow rate is obtained from the differential pressure signal. Both methods are experimented with over a wide range of frequency. The results show that both methods are not only simple and practical, but also very accurate for the measurement of high frequency pulsating flow rates.

scholarly journals Investigating a pulsating flow in the smooth channel and at the bifurcation section with regard to the popliteal artery hemodynamics

2021 ◽  
Vol 2119 (1) ◽  
pp. 012020
Author(s):  
V M Molochnikov ◽  
N I Mikheev ◽  
A N Mikheev ◽  
A A Paereliy ◽  
A E Goltsman
Keyword(s):  
Popliteal Artery ◽  
Vortex Flow ◽  
Pulsating Flow ◽  
Experimental Setup ◽  
Wall Region ◽  
Flow Rates ◽  
Turbulent Transition ◽  
Smooth Channel ◽  
Outflow Channels ◽  
Near Wall

Abstract Experimental setup is described. Pulsating flow in a smooth channel, and steady and pulsating flows at a bifurcation section simulating the distal end of an artery anastomosis at different flow rates in the main and outflow channels are studied. Indications of laminar-turbulent transition are observed in the near-wall region of the smooth channel. Mechanisms of turbulization of the near-wall region in the pulsating flow are suggested. Vortex flow structure in the bifurcation section is analyzed.

Automation of Process Control in Chemical Plant

2015 ◽  
Vol 2 (1) ◽  
pp. 6-12
Author(s):  
Agus Sugiarta ◽  
Houtman P. Siregar ◽  
Dedy Loebis
Keyword(s):  
Process Control ◽  
Pid Control ◽  
Control Algorithm ◽  
Chemical Engineering ◽  
Chemical Plant ◽  
Raw Material ◽  
Flow Rates ◽  
Material Supply ◽  
Wide Range ◽  
Inherent Problem

Automation of process control in chemical plant is an inspiring application field of mechatronicengineering. In order to understand the complexity of the automation and its application requireknowledges of chemical engineering, mechatronic and other numerous interconnected studies.The background of this paper is an inherent problem of overheating due to lack of level controlsystem. The objective of this research is to control the dynamic process of desired level more tightlywhich is able to stabilize raw material supply into the chemical plant system.The chemical plant is operated within a wide range of feed compositions and flow rates whichmake the process control become difficult. This research uses modelling for efficiency reason andanalyzes the model by PID control algorithm along with its simulations by using Matlab.

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