Imperial College London
Professor Richard Syms

ProfessorRichardSyms

Faculty of Engineering, Department of Electrical and Electronic Engineering

Professor
 
 
 
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Contact

 

+44 (0)20 7594 6203r.syms

 
 
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Location

 

702Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Syms:2023:10.1063/5.0129510,
author = {Syms, RRA and Wright, S},
doi = {10.1063/5.0129510},
journal = {Biomicrofluidics},
pages = {1--12},
title = {Paper-based evaporation concentrators: Comparison of linear and radial geometries},
url = {http://dx.doi.org/10.1063/5.0129510},
volume = {17},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Paper-based evaporation concentrators with linear and radial geometries are compared. A new method of finding approximate analytic solutions of the advection–dispersion equation is proposed, based on the behavior of concentrators with infinite sources. Analytic approximations are compared with numerical solutions, and the advantage of radial concentration is highlighted: linear concentration rates scale with the square root of the Péclet number Pe while radial rates scale with Pe itself, leading to faster radial concentration beyond a critical value. Experiments are performed with Brilliant Blue FCF dye, using optical transmission and the Beer–Lambert law for quantitation. Dye concentrations are chosen for operation in the linear absorbance regime. Radial concentration is demonstrated under ambient conditions on filter paper disks with 60 mm diameter evaporation areas fed from a perimeter source, in a reverse of the well-known “coffee stain” experiment. Airflow enhanced concentration in strips and wedges is compared directly, using laser-patterned chromatography paper. The advantage of radial concentration is confirmed (and enhanced by diversion of concentrate to the corners of strips) and concentration factors greater than ∼500 (the dynamic range of measurement) are obtained in ∼2 h using 30 mm long columns.
AU  - Syms,RRA
AU  - Wright,S
DO  - 10.1063/5.0129510
EP  - 12
PY  - 2023///
SN  - 1932-1058
SP  - 1
TI  - Paper-based evaporation concentrators: Comparison of linear and radial geometries
T2  - Biomicrofluidics
UR  - http://dx.doi.org/10.1063/5.0129510
UR  - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000907663600001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
UR  - https://aip.scitation.org/doi/10.1063/5.0129510
UR  - http://hdl.handle.net/10044/1/101746
VL  - 17
ER  -
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