The influence of the chromatographic effect on determination of the rate of longitudinal mixing in a flow-through reactor

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.

Download Full-text

Contribution to Automation for Determination of Drugs Based on Flow-Through Optosensors

Applied Spectroscopy Reviews ◽

10.1080/05704928.2011.555897 ◽

2011 ◽

Vol 46 (5) ◽

pp. 339-367 ◽

Cited By ~ 7

Author(s):

E. J. Llorent-Martínez ◽

P. Ortega-Barrales ◽

M. L. Fernández-De Córdova ◽

A. Ruiz-Medina

Keyword(s):

Flow Through

Download Full-text

In situ determination of porewater gases by underwater flow-through membrane inlet mass spectrometry

Limnology and Oceanography Methods ◽

10.4319/lom.2012.10.117 ◽

2012 ◽

Vol 10 (3) ◽

pp. 117-128 ◽

Cited By ~ 3

Author(s):

Ryan J. Bell ◽

William B. Savidge ◽

Strawn K. Toler ◽

Robert H. Byrne ◽

R. Timothy Short

Keyword(s):

Mass Spectrometry ◽

Membrane Inlet Mass Spectrometry ◽

Flow Through

Download Full-text

Determination of the total cadmium, copper, lead and zinc concentrations and their labile species fraction in apple beverages by flow-through anodic stripping chronopotentiometry

Food Chemistry ◽

10.1016/j.foodchem.2016.12.092 ◽

2017 ◽

Vol 225 ◽

pp. 220-229 ◽

Cited By ~ 12

Author(s):

Dominika Jedryczko ◽

Paweł Pohl ◽

Maja Welna

Keyword(s):

Lead And Zinc ◽

Stripping Chronopotentiometry ◽

Anodic Stripping ◽

Zinc Concentrations ◽

Flow Through ◽

Copper Lead

Download Full-text

Determination of the Discharge Coefficient of a Thin-Walled Orifice Used in Hydrostatic Bearings

Journal of Tribology ◽

10.1115/1.1843158 ◽

2005 ◽

Vol 127 (3) ◽

pp. 679-684 ◽

Cited By ~ 9

Author(s):

S. Charles ◽

O. Bonneau ◽

J. Fre^ne

Keyword(s):

Discharge Coefficient ◽

Ad Hoc ◽

Thrust Bearing ◽

Accurate Estimation ◽

Hydrostatic Bearing ◽

Hydrostatic Bearings ◽

Flow Through ◽

Thin Walled ◽

Experimental Bench

The characteristics of hydrostatic bearings can be influenced by the compensating device they use, for example, a thin-walled orifice (diaphragm). The flow through the orifice is given by a law where an ad hoc discharge coefficient appears, and, in order to guarantee the characteristics of the hydrostatic bearing, this coefficient must be calibrated. The aim of this work is to provide an accurate estimation of the discharge coefficient under specific conditions. Therefore an experimental bench was designed and a numerical model was carried out. The results obtained then by the experimental and theoretical approach were compared with the values given by the literature. Finally, the influence of the discharge coefficient on the behavior of a thrust bearing is examined.

Download Full-text