We fully characterize the natural evaporation of human drops of blood from substrates and substrate-dependent behavior. The heat flux adsorbed by the drops for evaporation is measured by means of a heat flux meter. A side-view measurement enables access to the drop contact angle, wetting diameter, and initial height. A top-view camera allows for the monitoring of the drying regime (deposition, gelation, and fracturation). This directly measured heat flux is related to the evaporative mass flux obtained from the mass of the drop, and the two show good agreement. Both types of measurements indicate that regardless of the substrate type, there is first a linearly decreasing regime of evaporation when the drop is mostly liquid and a second regime characterized by a sharp decrease. We show that the evaporation dynamics are influenced by the substrate’s wettability but not by the substrate’s thermal diffusivity. The different regimes of evaporation exhibited by glass and metallic substrates are explained in terms of evaporation fluxes at the drop surface. In the case of wetting drops (below 40 deg), the evaporation flux is very important along the drop periphery and decreases across the interface, whereas in the case of nonwetting drops (about 90 deg), the evaporation flux is almost uniform across the droplet’s surface. We show that these different evaporation fluxes strongly influence the drying behavior. In the case of metallic substrates, this enables the formation of a uniform "glassy skin" around the droplet surface and, in the case of glass substrates, the formation a skin along the drop periphery with an inward gelation front. This behavior is analyzed in terms of the competition between the drying time and the gel formation time. Unstable drop surfaces were observed at high initial contact angles and are very similar to those of polymer drops.
Skip Nav Destination
Article navigation
Bio-Heat And Mass Transfer
Influence of Substrate Nature on the Evaporation of a Sessile Drop of Blood
Benjamin Sobac,
Benjamin Sobac
Aix-Marseille University
, IUSTI UMR 7343 CNRS, Marseilles 13013, France
Search for other works by this author on:
Céline Nicloux
Céline Nicloux
Institut de Recherche Criminelle de la Gendarmerie Nationale
, IRCGN-DCIH-DATO, Rosny sous Bois 93110, France
Search for other works by this author on:
Benjamin Sobac
Aix-Marseille University
, IUSTI UMR 7343 CNRS, Marseilles 13013, France
Céline Nicloux
Institut de Recherche Criminelle de la Gendarmerie Nationale
, IRCGN-DCIH-DATO, Rosny sous Bois 93110, France
J. Heat Transfer. Jun 2012, 134(6): 061101 (7 pages)
Published Online: May 8, 2012
Article history
Received:
March 21, 2011
Revised:
December 6, 2011
Online:
May 8, 2012
Published:
May 8, 2012
Citation
Brutin, D., Sobac, B., and Nicloux, C. (May 8, 2012). "Influence of Substrate Nature on the Evaporation of a Sessile Drop of Blood." ASME. J. Heat Transfer. June 2012; 134(6): 061101. https://doi.org/10.1115/1.4006033
Download citation file:
Get Email Alerts
Cited By
The Effect of Biot Number on a Generalized Heat Conduction Solution
J. Heat Mass Transfer
Numerical Investigation of Conjugate Natural Convection From a Vertical Cylindrical Open Cavity
J. Heat Mass Transfer (August 2023)
Heat Transfer and Pressure Loss of Turbulent Flow in a Wedge-Shaped Cooling Channel With Different Types of Triply Periodic Minimal Surfaces
J. Heat Mass Transfer (September 2023)
Related Articles
Heat Transfer Photogallery
J. Heat Transfer (August,2006)
Heat Transfer Model for Evaporation of Elongated Bubble Flows in Microchannels
J. Heat Transfer (December,2002)
Evaluation of the Maximum Evaporation Rate in Small-Scale Indirect Solar Dryers
J. Sol. Energy Eng (April,2016)
High Intensity Drying in Porous Materials
J. Thermal Sci. Eng. Appl (June,2012)
Related Proceedings Papers
Related Chapters
Insulating Properties of W-Doped Ga2O3 Films Grown on Si Substrate for Low-K Applications
International Conference on Advanced Computer Theory and Engineering, 4th (ICACTE 2011)
Gas-Fluidized Beds
Two-Phase Heat Transfer
Syntheses of Mesoporous Silica Materials
Silica Nanoparticles as Drug Delivery System for Immunomodulator GMDP (Biomedical & Nanomedical Technologies - Concise Monograph Series)