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Title: Spreading of blood drops over dry porous substrate: complete wetting case
Authors: Chao, Tzu-Chieh
Arjmandi-Tash, Omid
Das, Diganta Bhusan
Starov, Victor
Keywords: Dry blood spot sampling
Blood
Dry porous layer
Capillary spreading
Imbibition
Issue Date: 2015
Publisher: Elsevier
Citation: CHAO, T. ... et al., 2015. Spreading of blood drops over dry porous substrate: complete wetting case. Journal of Colloid and Interface Science, 446, pp. 218-225.
Abstract: Hypothesis The process of dried blood spot sampling involves simultaneous spreading and penetration of blood into a porous filter paper with subsequent evaporation and drying. Spreading of small drops of blood, which is a non-Newtonian liquid, over a dry porous layer is investigated from both theoretical and experimental points of view. Experiments and Theory A system of two differential equations is derived, which describes the time evolution of radii of both the drop base and the wetted region inside the porous medium. The system of equations does not include any fitting parameters. The predicted time evolutions of both radii are compared with experimental data published earlier. Findings For a given power law dependency of viscosity of blood with different haematocrit level, radii of both drop base and wetted region, and contact angle fell on three universal curves if appropriate scales are used with a plot of the dimensionless radii of the drop base and the wetted region inside the porous layer and dynamic contact angle on dimensionless time. The predicted theoretical relationships are three universal curves accounting satisfactorily for the experimental data.
Description: This is an Open Access Article. It is published by Elsevier as Open Access at: http://dx.doi.org/10.1016/j.jcis.2015.01.054
Sponsor: O. Arjmandy-Tash’s and V. Starov’s research was supported by Engineering and Physical Sciences Research Council, UK [grant number: EP/J010596/1], CoWet Marie Curie ITN project, EU and COST MP1106 project. Tzu Chieh Chao’s research was supported by Department of Chemical Engineering Loughborough University, UK.
Version: Published
DOI: 10.1016/j.jcis.2015.01.054
URI: https://dspace.lboro.ac.uk/2134/16624
Publisher Link: http://dx.doi.org/10.1016/j.jcis.2015.01.054
Appears in Collections:Published Articles (Chemical Engineering)

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