Document Type : Full article


1 Department of Chemical Engineering, Isfahan University of Technology

2 Chemical Engineering, Isfahan University of Technology


The electrohydrodynamic (EHD) drying of Poly (vinyl acetate) latex films was experimentally investigated in a wind tunnel. The influence of various conditions such as the air temperature, air velocity, and concentration of the latex solution, in the presence and the absence of a high electric field, was investigated. The effects of the applied voltage intensity, electrode gap, number of needle electrodes, and polarity of corona on the drying rate of polymer films were studies. The drying behavior of films in a wind tunnel was observed by the weighting method and analyzed based on the heat and mass transfer. Results showed the importance of the EHD role in the drying rate of the polymer film. Increasing the intensity of the electric field, number, and configuration of needle electrodes, and decreasing the electrode gap lead to a significant enhancement of the drying rate of the polymer film. Scanning electron microscope (SEM) images were used to analyze the effect of EHD on the morphology of dried films.


[1]      Strumillo, C., Jones, P. L. and Żyłła, R., Energy aspects in drying, Handbook of industrial drying, 1075 (2014). ( 10.1201/b17208-59).
[2]      Motevali, A., Minaei, S. and Khoshtagaza, M. H., “Evaluation of energy consumption in different drying methods”, Energy Conversion and Management,52(2), 1192 (2011).
[3]      Singh, A., Orsat, V. and Raghavan, V. A., “Comprehensive review on electrohydrodynamic drying and high-voltage electric field in the context of food and bioprocessing”, Drying Technology,30, 1812 (2012).
[4]      Panofsky, W. K. and Phillips, M., Classical electricity and magnetism, Courier Corporation, (2005).
[5]      Li, L. -T., Sun, J. -F. and Tatsumi, E., “Effect of electrohydrodynamic (EHD) technique on drying process and appearance of okara cake”, Journal of Food Engineering,77(2), 275 (2006).
[6]      Alemrajabi, A. A., Rezaee, F., Mirhosseini, M. and Esehaghbeygi, A., “Comparative evaluation of the effects of electrohydrodynamic, oven, and ambient air on carrot cylindrical slices during drying process”, Drying Technology,30 (1), 88 (2012).
[7]      Cao, W., Nishiyama, Y. and Koide, S., “Electrohydrodynamic drying characteristics of wheat using high voltage electrostatic field”, Journal of Food Engineering,62(3), 209 (2004).
[8]      Atungulu, G., Atungulu, E. and Nishiyama, Y., “Electrode configuration and treatment timing effects of electric fields on fruit putrefaction and molding post harvest”, Journal of Food Engineering,70(4), 506 (2005).
[9]      Basiry, M. and Esehaghbeygi, A., “Electrohydrodynamic (EHD) drying of rapeseed (Brassica napus L.)”, Journal of electrostatics,68(4), 360 (2010).
[10]  Elmizadeh, A., Shahedi, M. and Hamdami, N., “Comparison of electrohydrodynamic and hot-air drying of the quince slices”, Innovative Food Science & Emerging Technologies,43, 130 (2017).
[11]  Martynenko, A. and Zheng, W., “Electrohydrodynamic drying of apple slices: Energy and quality aspects”, Journal of Food Engineering,168, 215 (2016).
[12]  Singh, A., Vanga, S. K., Nair, G. R., Gariepy, Y., Orsat, V. and Raghavan, V., Electrohydrodynamic drying (EHD) of wheat and its effect on wheat protein conformation”, LWT-Food Science and Technology,64(2), 750 (2015).
[13]  Ahmadzadeh, S., Nasirpour, A., Beygy Harchegani, M., Hamdami, N. and Keramat, J., “Effect of electrohydrodynamic technique as a complementary process for cellulose extraction from bagasse: Crystalline to amorphous transition”, Carbohydr. Polym.,188, 188 (2018).
[14]  Lai, F. and Sharma, R., “EHD-enhanced drying with multiple needle electrode”, Journal of Electrostatics,63(3-4), 223 (2005).
[15]  Lai, F. and Wong, D., “EHD-enhanced drying with needle electrode”, Drying Technology,21(7), 1291 (2003).
[16]  Dalvand, M. J., Mohtasebi, S. S. and Rafiee, S., “Effect of needle number on drying rate of kiwi fruit in EHD drying process”, Agricultural Sciences, 4 (1), 1 (2013).
[17]  Balcer, B. and Lai, F., “EHD-enhanced drying with multiple-wire electrode”, Drying Technology,22(4), 821 (2004).
[18]  Lai, F. and Lai, K. -W., “EHD-enhanced drying with wire electrode”, Drying Technology,20(7), 1393 (2002).
[19]  Kamkari, B. and Alemrajabi, A. A., “Investigation of electrohydrodynamically-enhanced convective heat and mass transfer from water surface”, Heat Transfer Engineering,31(2), 138 (2010).
[20]  Barthakur, N. and Arnold, N., “Evaporation rate enhancement of water with air ions from a corona discharge”, International Journal of Biometeorology,39(1), 29 (1995).
[21]  AlemRajabi, A. A. and Lai, F., “EHD-enhanced drying of partially wetted glass beads”, Drying Technology,3(3), 597 (2005).
[22]  Bai, Y., Hu, Y. and Li, X., “Influence of operating parameters on energy consumption of electrohydrodynamic drying”, International Journal of Applied Electromagnetics and Mechanics,35(1), 57 (2011).
[23]  Martynenko, A., Astatkie, T., Riaud, N., Wells, P. and Kudra, T., “Driving forces for mass transfer in electrohydrodynamic (EHD) drying”, Innovative Food Science & Emerging Technologies,43, 18 (2017).
[24]  Bardy, E., Hamdi, M., Havet, M. and Rouaud, O., “Transient exergetic efficiency and moisture loss analysis of forced convection drying with and without electrohydrodynamic enhancement”, Energy,89, 519 (2015).
[25]  Rashidi, S., Bafekr, H., Masoodi, R. and Languri, E. M., “EHD in thermal energy systems-A review of the applications, modelling, and experiments”, Journal of Electrostatics,90, 1 (2017).
[26]  Huang, M. and Lai, F., “Numerical study of EHD-enhanced water evaporation”, Journal of Electrostatics,68(4), 364 (2010).
[27]  Heidarinejad, G. and Babaei, R., “Numerical investigation of electro hydrodynamics (EHD) enhanced water evaporation using Large Eddy Simulation turbulent model”, Journal of Electrostatics,77, 76 (2015).
[28]  Etemad, S. G., Etesami, N., Bagheri, R. and Thibault, J., “Drying of latex films of poly (vinyl acetate)”, Drying Technology,20(9), 1843 (2002).
[29]  Kiil, S., “Drying of latex films and coatings: Reconsidering the fundamental mechanisms”, Progress in Organic Coatings,57(3), 236 (2006).
[30]  Sheetz, D., “Formation of films by drying of latex”, Journal of Applied Polymer Science,9(11), 3759 (1965).
[31]  Brennan, W., Briens, L., Briens, C. and Zanin, J., “Using a new diffusivity model to accelerate the drying of biopolymer films”, The Canadian Journal of Chemical Engineering,87 (5), 761 (2009).
[32]  Cáceres, C. A., Mazzola, N., França, M. and Canevarolo, S. V., “Controlling in-line the energy level applied during the corona treatment”, Polymer Testing,31(4), 505 (2012).
[33]  Orihara, H., Nishimoto, Y., Aida, K., Na, Y., Nagaya, T. and Ujiie, S., “Morphology and rheology of an immiscible polymer blend subjected to a step electric field under shear flow”, Journal of Physics: Condensed Matter,23(28), 284106 (2011).