Two-phase flow, Superhydrophobic surfaces, Drag reduction
Superhydrophobic surfaces have been shown to reduce drag in single-phase channel flow; however, little work has been done to characterize their drag-reducing ability found in two-phase flows. Adiabatic, airwater mixtures were used to explore the influence of hydrophobicity on two-phase flows and the hydrodynamics which might be present in flow condensation environments. Pressure drop measurements in a rectangular channel with one superhydrophobic wall (cross-section approximately 0.37 x 10 mm) and three transparent hydrophilic walls were obtained. Data for air/water mixtures with superficial Reynolds numbers ranging from 22–215 and 55–220, respectively, were obtained for superhydrophobic surfaces with three different cavity fractions. Agreement between experimentally obtained two-phase pressure drop data and correlations in the literature for conventional smooth control surfaces was better than 20 percent, which is within the accuracy of the correlations. The data reveal a reduction in the pressure drop for two-phase flow in a channel with a single superhydrophobic wall compared to a control scenario. The observed reduction is approximately 10 percent greater than the reduction that is observed for single-phase flow (relative to a classical channel).
Original Publication Citation
Stevens, K., Crockett, J., Maynes, R. D., and Iverson, B. D., 2017, "Two-phase flow pressure drop in superhydrophobic channels," International Journal of Heat and Mass Transfer, Vol. 110, pp. 515-522.
BYU ScholarsArchive Citation
Stevens, Kimberly A.; Crockett, Julie; Maynes, Daniel R.; and Iverson, Brian D., "Two-Phase Flow Pressure Drop in Superhydrophobic Channels" (2017). All Faculty Publications. 1861.
Ira A. Fulton College of Engineering and Technology
The final publisher's version of this article can be found at http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.03.055.
Copyright Use Information
Available for download on Friday, March 16, 2018