Analysis of Corona Wind Effect on Mass Transfer and Energy Consumption in Drying of Moist Object

Document Type : Research Article

Authors

1 Department of Mechanical Engineering, University of Guilan, Rasht, Iran

2 2Faculty of Technology and Engineering, East of Guilan, University of Guilan, Rudsar, Iran

Abstract

In this paper, drying of the moist object is numerically investigated in the forced convection with and without the electric field. Finite volume method is used to solve governing equations of electric, flow, temperature, and the concentration fields in flow phase, as well as the temperature and the moisture fields in the moist object. In this study, the effect of applied voltage and the arrangement of the emitting electrode are evaluated. The results indicated that in presence of electric field, the increment of the applied voltage for 18 kV to 24 kV, the mass transfer from porous object 3.78 times and power consumption 7.96 times are increased. It is also found that the drying rate is increased by decreasing the distance between the emitting and collecting electrodes. According to numerical results, the mass transfer enhancement is usually accompanied by penalty of electric energy consumption. Therefore, the specific energy consumption has been evaluated as final criterion. It is shown that the specific energy consumption of the electrohydrodynamic drying process has been remarkably affected by the changing of the emitter arrangements. Finally, an optimum arrangement has been introduced as the affordable arrangement.

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References

[1] T. Bajgai, F. Hashinaga, High electric field drying of Japanese radish, Drying Technology, 19(9) (2001) 2291- 2302.
[2] M. Molki, P. Damronglerd, Electrohydrodynamic enhancement of heat transfer for developing air flow in square ducts, Heat Transfer Engineering, 27(1) (2006) 35-45.
[3] S. Ayuttaya, C. Chaktranond, P. Rattanadecho, M. Transfer, Numerical analysis of electric force influence on heat transfer in a channel flow (theory based on saturated porous medium approach), International Journal of Heat and Mass Transfer, 64 (2013) 361-374.
[4] H.M. Deylami, N. Amanifard, F. Dolati, R. Kouhikamali, K. Mostajiri, Numerical investigation of using various electrode arrangements for amplifying the EHD enhanced heat transfer in a smooth channel, Journal of Electrostatics, 71(4) (2013) 656-665.
[5] G. Heidarinejad, R. Babaei, Numerical investigation of electro hydrodynamics (EHD) enhanced water evaporation using Large Eddy Simulation turbulent model, Journal of Electrostatics, 77 (2015) 76-87.
[6] M. Peng, T. Wang, X.Wang, M. Transfer, Effect of longitudinal electrode arrangement on EHD-induced heat transfer enhancement in a rectangular channel, International Journal of Heat and Mass Transfer, 93 (2016) 1072-1081.
[7] Y. Chen, N. Barthakur, N. Arnold, Electrohydrodynamic (EHD) drying of potato slabs, Journal of Food Engineering, 23(1) (1994) 107-119.
[8] N. Amanifard, A. Haghi, A numerical study on drying of porous media, Korean Journal of Chemical Engineering, 25(2) (2008) 191.
[9] M.J. Dalvand, S.S. Mohtasebi, S. Rafiee, Effect of needle number on drying rate of kiwi fruit in EHD drying process, Agricultural Sciences, 4(01) (2013).
[10] S.T. Dinani, M. Havet, Products, Effect of voltage and air flow velocity of combined convectiveelectrohydrodynamic drying system on the physical properties of mushroom slices, Industrial Crops and Products, 70 (2015) 417-426.
[11] A. Martynenko, W. Zheng, Electrohydrodynamic drying of apple slices: Energy and quality aspects, Journal of Food Engineering, 168 (2016) 215-222.
[12] M. Yang, C. Ding, Electrohydrodynamic (EHD) drying of the Chinese wolfberry fruits, SpringerPlus, 5(1) (2016) 909.
[13] F. Dolati, N. Amanifard, H. Mohaddes Daylami, Kh. Yazdani, Numerical analysis of the electric field effect on mass transfer through a moist object, Modares Mechanical Engineering, 17(1) (2017) 383-393.
[14] A. Castellanos, A. Ramos, A. Gonzalez, N.G. Green, H. Morgan, Electrohydrodynamics and dielectrophoresis in microsystems: scaling laws, Journal of Physics D: Applied Physics, 36(20) (2003) 2584.
[15] K. Adamiak, P. Atten, Simulation of corona discharge in point–plane configuration, Journal of electrostatics, 61(2) (2004) 85-98.
[16] J. Zhang, F. Lai, Effect of emitting electrode number on the performance of EHD gas pump in a rectangular channel, Journal of Electrostatics, 69(6) (2011) 486-493.
[17] M. Huang, F. Lai, Numerical study of EHD-enhanced forced convection using two-way coupling, Journal of Heat Transfer, 125(4) (2003) 760-764.
[18] J.H. Davidson, E. Shaughnessy, Turbulence generation by electric body forces, Experiments in fluids, 4(1) (1986) 17-26.
[19] K. Murugesan, H. Suresh, K. Seetharamu, P.A. Narayana, T. Sundararajan, M. Transfer, A theoretical model of brick drying as a conjugate problem, International Journal of Heat and Mass Transfer, 44(21) (2001) 4075-4086.
[20] A. Martynenko, T. Kudra, technology, Electricallyinduced transport phenomena in EHD drying–A review, Trends in food science & technology, 54 (2016) 63-73.
[21] N. Oussalah, Y. Zebboudj, Finite-element analysis of positive and negative corona discharge in wire-to-plane system, The European Physical Journal-Applied Physics, 34(3) (2006) 215-223.
Amirkabir Journal of Mechanical Engineering
Volume 51, Issue 2
May and June 2019
Pages 281-296

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