Imperial College London

ProfessorChristosMarkides

Faculty of EngineeringDepartment of Chemical Engineering

Professor of Clean Energy Technologies
 
 
 
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Contact

 

+44 (0)20 7594 1601c.markides Website

 
 
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Location

 

404ACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Charogiannis:2017,
author = {Charogiannis, A and An, J and Markides, C},
publisher = {EDAS},
title = {A novel optical technique for accurate planar measurements of film-thickness and velocity in annular flows},
url = {http://hdl.handle.net/10044/1/78268},
year = {2017}
}

RIS format (EndNote, RefMan)

TY  - CPAPER
AB - Gas-liquid annular flow is one of many possible two-phase flow regimes that are encountered in the (e.g., parabolic collector) solar fields of direct-evaporation concentrated solar-power (CSP) plants. Conventional planar laser-induced fluorescence (PLIF) has been used previously to investigate the liquid film topology (i.e. film thickness) in annular flows, however, limitations have been found regarding the accurate identification of the gas-liquid interface with this technique, especially when the interface is smooth. Therefore, a novel variation of PLIF, which we refer to as structured planar laser-induced fluorescence (S-PLIF), has been developed to overcome these limitations. In this study, S-PLIF is used to investigate the topology of falling films in a vertical pipe over the range ReL≈ 150 – 1500. Comparison of S-PLIF at two different angles (70° and 90°) shows that the technique performs better with an observation angle of 70° as this minimizes the distortions caused by the radial liquid film structure. In addition, S-PLIF70 shows good agreement with data from other techniques that have shown reliability when studying smooth films over the same range of conditions.
AU - Charogiannis,A
AU - An,J
AU - Markides,C
PB - EDAS
PY - 2017///
TI - A novel optical technique for accurate planar measurements of film-thickness and velocity in annular flows
UR - http://hdl.handle.net/10044/1/78268
ER -