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Understanding the coupling between the moisture loss and surface temperature in an evaporating leaf-type surface

Kumar, N and Arakeri, JH (2020) Understanding the coupling between the moisture loss and surface temperature in an evaporating leaf-type surface. In: Drying Technology .

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Official URL: https://dx.doi.org/10.1080/07373937.2020.1817062


We experimentally report evaporation characteristics from leaf-like surfaces having low open (exposed) area ratio. Even at much lower (1�10) exposed areas, higher transpiration rates (60�70 compared to a bare water source) are sustained by a leaf. We mimic stomata, tiny openings present on the leaves using holes punched on silicon wafers (SW). The leaf-mimics have different opening diameters, ranging from (Formula presented.) to (Formula presented.) but nearly the same open area of (Formula presented.) The leaf-mimic with the smallest opening size was found to evaporate the most, while for the larger opening sizes it seems to decrease. In all the cases, evaporation ratio (ratio of the evaporation rate from the leaf-mimic to that of from a bare water surface at the same net incident radiation) increased with decreasing pore sizes; we compute this ratio based on three different definitions including one for the isothermal cases. In non-isothermal cases, we recognized that the variation in surface temperature led to nonlinear variation in the surface water vapor concentration. The effect of increased surface temperature, compared to a bare water surface in similar conditions, is missing in defining the evaporation ratios in previous approaches and thus we include it. © 2020 Taylor & Francis Group, LLC.

Item Type: Journal Article
Publication: Drying Technology
Publisher: Bellwether Publishing, Ltd.
Additional Information: The copyright of this article belongs to Bellwether Publishing, Ltd.
Keywords: Atmospheric temperature; Evaporation; Isotherms; Pore size; Silicon wafers; Surface properties, Evaporation rate; Incident radiation; Non-linear variation; Nonisothermal; Surface temperatures; Transpiration rates; Water surface; Water vapor concentration, Surface waters
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 03 Nov 2020 07:31
Last Modified: 03 Nov 2020 07:31
URI: http://eprints.iisc.ac.in/id/eprint/66696

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