Determination of the vibration-frequency density meter temperature error of the liquid used in mass flow meters for the chemical industry

This paper analyzes velocity profiles for flow through circular tubes in laminar, turbulent, and transition region flows and how they affect measurement by flow-meters. Experimental measurements of velocity profiles across the cross-section of straight circular tubes were made using laser doppler velocimetry. In addition, flow visualization was done using the hydrogen bubble technique. Velocity profiles in the laminar and the turbulent flow are quite predictable which allow the determination of meter factors for accurate flow measurement. However, the profiles can not be predicted at all in the transition region. Therefore, for the accuracy of the flowmeter, it must be ensured that the flow is completely in the laminar regime or completely in the turbulent regime. In the laminar flow a bend, even at a large distance, affects the meter factor. The paper also discusses some strategies to restructure the flow to avoid the transition region.

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Application of Thermal Sensors for Determination of Mass Flow Rate and Velocity of Flow in Pipes of Hermetic Systems

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.826.117 ◽

2019 ◽

Vol 826 ◽

pp. 117-124

Author(s):

Yurii Baidak ◽

Iryna Vereitina

Keyword(s):

Temperature Distribution ◽

Mass Flow Rate ◽

Cross Section ◽

Correction Factor ◽

Mass Flow ◽

Flow Rate ◽

Thermal Sensors ◽

Pipe Surface ◽

Pipe Cross Section

The paper relates to the field of measuring technologies and deals with the enhancement of thermoconvective method when it is applied for the experimental determination of such hydrodynamics indicators as mass flow rate and velocity of flow by their indirect parameters - capacity of the heater and the temperatures obtained from two thermal sensors, provided that they are located on the hermetic piping system surface. The issue of determination of correction factor on heterogeneity of liquid temperature distribution in the pipe cross section depending on pipe diameter and fluid movement velocity was clarified. According to the results of numerical calculations, the dependencies of temperature gradient on the pipe surface and the correction factor on the heterogeneity of the temperature distribution along the pipe cross-section under the heater in the function of the velocity of flow in pipes of different diameters are plotted. These dependencies specify the thermal method of studying the fluid flow in the pipes, simplify the experiment conduction, are useful in processing of the obtained results and can be applied in measuring engineering.

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Determination of Seismic Safe Distances During Mining Blasts with Consideration of a Dominant Vibration Frequency

Proceedings of the 8th Russian-Chinese Symposium "Coal in the 21st Century: Mining, Processing, Safety" ◽

10.2991/coal-16.2016.40 ◽

2016 ◽

Author(s):

Aleksey Novinkov ◽

Aleksandr Tashkinov ◽

Sergey Protasov

Keyword(s):

Vibration Frequency ◽

Dominant Vibration Frequency

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Gas mass-flow meters: Measurement and uncertainties

Flow Measurement and Instrumentation ◽

10.1016/j.flowmeasinst.2013.04.011 ◽

2013 ◽

Vol 33 ◽

pp. 45-54 ◽

Cited By ~ 3

Author(s):

Manuel Arlindo Amador de Matos ◽

Nuno José Fernandes Rodrigues

Keyword(s):

Mass Flow ◽

Flow Meters

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Mass Flow and Derivative Moment of Inertia Flow in Planar (Geared) Linkages

22nd Biennial Mechanisms Conference: Flexible Mechanisms, Dynamics, and Analysis ◽

10.1115/detc1992-0414 ◽

1992 ◽

Author(s):

Zhonghe Ye ◽

M. R. Smith

Keyword(s):

Mass Flow ◽

Kinematic Analysis ◽

Moment Of Inertia ◽

Force Balance ◽

New Concepts ◽

Prismatic Joints ◽

Planar Linkages ◽

First Time ◽

Shaking Moment

Abstract The paper describes a method for the determination of the conditions for the complete shaking force and shaking moment balancing of planar linkages, including geared linkages, with revolute and prismatic joints. The conditions may be written down without the need for any kinematic analysis of the linkage by the application of two new concepts. These are the concept of mass flow for complete shaking force balance and the concept of derivative moment of inertia flow for complete shaking moment balance, the second of which is described here for the first time. A number of examples demonstrate the power of the method.

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Temperature during the vibration-assisted compression of alfalfa

BioResources ◽

10.15376/biores.16.1.141-150 ◽

2020 ◽

Vol 16 (1) ◽

pp. 141-150

Author(s):

Xiaoyu Wu ◽

Shuai Yang ◽

Chundong Song ◽

Kun Ding ◽

Chuanzhong Xuan ◽

...

Keyword(s):

Energy Consumption ◽

Vibration Frequency ◽

Experimental Results ◽

Maximum Temperature ◽

Compression Time ◽

Vibration Parameters ◽

Reducing Energy ◽

Compression Temperature

Compression of alfalfa into briquettes is an effective way to solve the problem of storage and transportation. In the process of compression, heat is generated and the temperature is raised in the material. In fact, the appropriate temperature can improve the quality of alfalfa briquettes and reduce the energy consumption of densification. In this study, the effect of assisted vibration on the compression temperature was tested. The results showed that when the vibration frequency was below 15 Hz, the temperature at the center and side in compressed alfalfa increased slowly with compression time. When the vibration frequency was above 20 Hz, it increased first and then decreased with the increase of time. Moreover, the maximum temperature value increased remarkably when the frequency was above 20 Hz. In the same vibration frequency and compression time, the center temperature in the compressed alfalfa was higher than the side temperature. The experimental results provide a reference for the determination of reasonable vibration parameters, and explanation of the effect of vibration on reducing energy consumption.

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