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Interfacial Phenomena and Heat Transfer
ESCI SJR: 0.258 SNIP: 0.574 CiteScore™: 0.8

ISSN Druckformat: 2169-2785
ISSN Online: 2167-857X

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2019030171
pages 391-407


Partha Pratim Chakraborty
Kansas State University, Manhattan, Kansas 66506, USA
Ryan Huber
Department of Mechanical and Nuclear Engineering, Kansas State University, Manhattan, KS, USA
Xi Chen
Kansas State University, Manhattan, KS 66506, USA; Intel Corporation, Hillsboro, Oregon 97124, USA
Melanie M. Derby
Department of Mechanical and Nuclear Engineering, Kansas State University, Manhattan, KS, USA


Two-thirds of worldwide water withdrawals are for agriculture; this represents a key challenge in the food–energy–water nexus. In the U.S. Central High Plains, the Ogallala aquifer—the primary water source for agriculture—is depleting. Reducing water evaporation from soil provides an opportunity to decrease irrigation, thus conserving water resources. In this study, evaporation phenomena of 4 μL sessile water droplets were analyzed from a simulated soil pore created with 2.38 mm hydrophilic glass and hydrophobic Teflon beads. The experiments were conducted at 22°C and 60% relative humidity. Two geometries were studied: symmetric (i.e., center-to-center spacing between the beads of 3.1 mm) and asymmetric (i.e., center-to-center spacings of 2.7 mm and 2.8 mm). Evaporation phenomena were recorded using a high-speed camera and evaporation times were recorded. Evaporation was faster from the hydrophilic pore (e.g., 34 min) compared to the hydrophobic pore (e.g., 42 min) in the symmetric configuration, due in part to greater air–water contact areas. Spacing between the beads affected evaporation, as evaporation rates to completely evaporate the droplet were slower for hydrophilic (e.g., 44 min) and hydrophobic (e.g., 56 min) pores in the asymmetric configuration. The formation of liquid island, projected area, liquid island contact angles, volume, and rupture strength of droplet were analyzed for all four combinations. The droplet retained its initial projected area, wetted length, and volume for a certain time during evaporation from Teflon pores (e.g., 5–10 min), while these parameters decreased simultaneously during evaporation from glass pores.


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