APS Logo

Shedding of condensate by a shearing airflow under an electric field

ORAL

Abstract

Condensation is required in the majority of industrial operations involving phase change. Efficient condensate removal (shedding) improves the performance of the systems associated with heat transfer. Apart from passive approaches, an alternating (AC) electric field has been used to promote condensation heat transfer by actively controlling droplet dynamics. To our knowledge, all the existing work has not considered the effect of electric field on the shedding of condensate by airflow. We will present our findings regarding the effect of electrowetting (EW)-based surfaces on droplet shedding and enhanced heat transfer during condensation of humid air. Condensate morphology and its impact on heat transfer coefficient will be discussed. This foundation may help one to use EW to improve heat transfer and condensate shedding under shear flow.

Publication: [1] R. V Wahlgren, "Atmospheric water vapour processor designs for potable water production: a review," Water Res., vol. 35, no. 1, pp. 1–22, 2001.<br>[2] D. Milani, A. Abbas, A. Vassallo, M. Chiesa, and D. Al Bakri, "Evaluation of using thermoelectric coolers in a dehumidification system to generate freshwater from ambient air," Chem. Eng. Sci. J., vol. 66, pp. 2491–2501, 2011.<br>[3] R. L. Webb and K. Hong, "Performance of Dehumidifying Heat Exchangers With and Without Wetting Coatings," in Transaction of the ASME, 1999, p. vol. 125, 1018-1026.<br>[4] S. Parekh, M. M. Faridb, J. R. Selmana, and S. Al-Hallaj, "Solar desalination with a humidification-dehumidification technique-a comprehensive technical review," Desalination, vol. 160, pp. 167–186, 2004.<br>[5] M.-H. Kim and C. W. Bullard, "Air-side performance of brazed aluminum heat exchangers under dehumidifying conditions," Int. J. Refrig., vol. 25, no. 7, pp. 924–934, 2002.<br>[6] M. Rama, N. Reddy, M. Yohan, and K. H. Reddy, "Heat Transfer Co-Efficient Through Dropwise Condensation and Filmwise Condensation Apparatus," Int. J. Sci. Res. Publ., vol. 2, no. 12, 2012.<br>[7] J. W. Rose, "Dropwise condensation theory and experiment: A review," Proc. Inst. Mech. Eng. Part A J. Power Energy, vol. 216, no. 2, pp. 115–128, 2002.<br>[8] A. Alizadeh, V. Bahadur, A. Kulkarni, M. Yamada, and J. A. Ruud, "Hydrophobic surfaces for control and enhancement of water phase transitions," MRS Bull., vol. 38, no. 5, pp. 407–411, May 2013.<br>[9] N. Miljkovic, R. Enright, and E. N. Wang, "Effect of droplet morphology on growth dynamics and heat transfer during condensation on superhydrophobic nanostructured surfaces," ACS Nano, vol. 6, no. 2, pp. 1776–1785, Feb. 2012.<br>[10] P. Meakin, "Steady state behavior in a model for droplet growth, sliding and coalescence: the final stage of dropwise condensation," Phys. A Stat. Mech. its Appl., vol. 183, no. 4, pp. 422–438, May 1992.<br>[11] N. Miljkovic et al., "Jumping-droplet-enhanced condensation on scalable superhydrophobic nanostructured surfaces," Nano Lett., vol. 13, no. 1, pp. 179–187, Jan. 2013.<br>[12] R. D. Narhe and D. A. Beysens, "Nucleation and growth on a superhydrophobic grooved surface," Phys. Rev. Lett., vol. 93, no. 7, p. 076103, Aug. 2004.<br>[13] N. Miljkovic, D. J. Preston, R. Enright, and E. N. Wang, "Electric-field-enhanced condensation on superhydrophobic nanostructured surfaces," ACS Nano, vol. 7, no. 12, pp. 11043–11054, Dec. 2013.<br>[14] A. Ghosh, S. Beaini, B. J. Zhang, R. Ganguly, and C. M. Megaridis, "Enhancing dropwise condensation through bioinspired wettability patterning," Langmuir, vol. 30, no. 43, pp. 13103–13115, 2014.<br>[15] J. B. Boreyko and C. H. Chen, "Self-propelled dropwise condensate on superhydrophobic surfaces," Phys. Rev. Lett., vol. 103, no. 18, p. 184501, Oct. 2009.<br>[16] C. Lee, H. Kim, and Y. Nam, "Drop Impact Dynamics on Oil-Infused Nanostructured Surfaces," Langmuir, vol. 30, no. 28, pp. 8400–8407, Jul. 2014.<br>[17] J. S. Wexler, I. Jacobi, and H. A. Stone, "Shear-driven failure of liquid-infused surfaces," Phys. Rev. Lett., vol. 114, no. 16, p. 168301, Apr. 2015.<br>[18] C. A. Papakonstantinou, H. Chen, V. Bertola, and A. Amirfazli, "Effect of condensation on surface contact angle," Colloids Surfaces A Physicochem. Eng. Asp., vol. 632, p. 127739, 2022.<br>[19] A. Ghosh, S. Beaini, B. J. Zhang, R. Ganguly, and C. M. Megaridis, "Enhancing dropwise condensation through bioinspired wettability patterning," Langmuir, vol. 30, no. 43, pp. 13103–13115, Nov. 2014.<br>[20] P. Birbarah, Z. Li, A. Pauls, and N. Miljkovic, "A Comprehensive Model of Electric-Field-Enhanced Jumping-Droplet Condensation on Superhydrophobic Surfaces," Langmuir, vol. 31, no. 28, pp. 7885–7896, Jul. 2015.<br>[21] X. Yan, J. Li, L. Li, Z. Huang, F. Wang, and Y. Wei, "Droplet condensation on superhydrophobic surfaces with enhanced dewetting under a tangential AC electric field," Appl. Phys. Lett., vol. 109, no. 16, p. 161601, Oct. 2016.<br>[22] T. Foulkes, J. Oh, P. Birbarah, J. Neely, N. Miljkovic, and R. C. N. Pilawa-Podgurski, "Active hot spot cooling of GaN transistors with electric field enhanced jumping droplet condensation," Conf. Proc. - IEEE Appl. Power Electron. Conf. Expo. - APEC, pp. 912–918, May 2017.<br>[23] A. Shahriari, P. Birbarah, J. Oh, N. Miljkovic, and V. Bahadur, "Electric Field–Based Control and Enhancement of Boiling and Condensation," https://doi.org/10.1080/15567265.2016.1253630, vol. 21, no. 2, pp. 102–121, Apr. 2016.<br>[24] E. D. Wikramanayake and V. Bahadur, "Electrowetting-based enhancement of droplet growth dynamics and heat transfer during humid air condensation," Int. J. Heat Mass Transf., vol. 140, pp. 260–268, Sep. 2019.<br>[25] F. Mugele and J. C. Baret, "Electrowetting: From basics to applications," J. Phys. Condens. Matter, vol. 17, no. 28, Jul. 2005.<br>[26] V. Bahadur and S. V. Garimella, "An energy-based model for electrowetting-induced droplet actuation," J. Micromechanics Microengineering, vol. 16, no. 8, p. 1494, Jun. 2006.<br>[27] N. Kumari, V. Bahadur, and S. V. Garimella, "Electrical actuation of electrically conducting and insulating droplets using ac and dc voltages," J. Micromechanics Microengineering, vol. 18, no. 10, p. 105015, Sep. 2008.<br>[28] J. Kim and M. Kaviany, "Purging of dropwise condensate by electrowetting," J. Appl. Phys., vol. 101, no. 10, 2007.<br>[29] L. Chen and E. Bonaccurso, "Electrowetting — From statics to dynamics," Adv. Colloid Interface Sci., vol. 210, pp. 2–12, Aug. 2014.<br>[30] D. Baratian, R. Dey, H. Hoek, D. Van Den Ende, and F. Mugele, "Breath Figures under Electrowetting: Electrically Controlled Evolution of Drop Condensation Patterns," Phys. Rev. Lett., vol. 120, no. 21, pp. 1–5, 2018.<br>[31] M. Shakeri Bonab, R. Kempers, and A. Amirfazli, "Determining transient heat transfer coefficient for dropwise condensation in the presence of an air flow," Int. J. Heat Mass Transf., vol. 173, p. 121278, 2021.<br>[32] A. Razzaghi, S. A. Banitabaei, and A. Amirfazli, "Shedding of multiple sessile droplets by an airflow," Phys. Fluids, vol. 30, no. 8, p. 087104, 2018.<br>[33] A. J. B. Milne and A. Amirfazli, "Drop Shedding by Shear Flow for Hydrophilic to Superhydrophobic Surfaces," Langmuir, vol. 25, no. 24, pp. 14155–14164, 2009.<br>[34] D. Baratian, R. Dey, H. Hoek, D. Van Den Ende, and F. Mugele, "Breath Figures under Electrowetting: Electrically Controlled Evolution of Drop Condensation Patterns," Phys. Rev. Lett., vol. 120, no. 21, May 2018.<br>[35] R. Kempers, P. Kolodner, A. Lyons, and A. J. Robinson, "A high-precision apparatus for the characterization of thermal interface materials," Rev. Sci. Instrum., vol. 80, no. 9, p. 095111, Sep. 2009.<br>[36] S. Danilo, C. Dominique, and P. Frédéric, "Experimental dropwise condensation of unsaturated humid air – Influence of humidity level on latent and convective heat transfer for fully developed turbulent flow," Int. J. Heat Mass Transf., vol. 102, pp. 846–855, 2016.<br>[37] S. J. Kline and F. A. McClintock, "Describing uncertainties in single-sample experiments," Mech. Eng., vol. 75, no. 1, pp. 3–8, 1953.<br>[38] E. D. Wikramanayake, J. Perry, and V. Bahadur, "AC electrowetting promoted droplet shedding on hydrophobic surfaces," Appl. Phys. Lett., vol. 116, no. 19, 2020.<br>[39] R. Dey, J. Gilbers, D. Baratian, H. Hoek, D. Van Den Ende, and F. Mugele, "Controlling shedding characteristics of condensate drops using electrowetting," Appl. Phys. Lett., vol. 113, no. 24, p. 243703, Dec. 2018.<br>[40] D. K. Mandal, A. Criscione, C. Tropea, and A. Amirfazli, "Shedding of Water Drops from a Surface under Icing Conditions," Langmuir, vol. 31, no. 34, pp. 9340–9347, 2015.<br>[41] A. Alshehri, J. P. Rothstein, and H. P. Kavehpour, "Improving heat and mass transfer rates through continuous drop-wise condensation," Sci. Reports 2021 111, vol. 11, no. 1, pp. 1–15, Oct. 2021.<br><br>

Presenters

  • Milad Shakeri Bonab

    York Univ

Authors

  • Milad Shakeri Bonab

    York Univ

  • Alidad Amirfazli

    York Univ

  • Roger Kempers

    York Univ