Investigation of Corona wind Effect on Heat and Mass Transfer Enhancement
Applying corona wind as a novel technique can lead
to a great level of heat and mass transfer augmentation by using very
small amount of energy. Enhancement of forced flow evaporation
rate by applying electric field (corona wind) has been experimentally
evaluated in this study. Corona wind produced by a fine wire
electrode which is charged with positive high DC voltage impinges
to water surface and leads to evaporation enhancement by disturbing
the saturated air layer over water surface. The study was focused on
the effect of corona wind velocity, electrode spacing and air flow
velocity on the level of evaporation enhancement. Two sets of
experiments, i.e. with and without electric field, have been
conducted. Data obtained from the first experiment were used as
reference for evaluation of evaporation enhancement at the presence
of electric field. Applied voltages ranged from corona threshold
voltage to spark over voltage at 1 kV increments. The results showed
that corona wind has great enhancement effect on water evaporation
rate, but its effectiveness gradually diminishes by increasing air flow
velocity. Maximum enhancements were 7.3 and 3.6 for air velocities
of 0.125 and 1.75 m/s, respectively.
[1] Laohalertdechaa, S., Naphonb, P., Wongwises, S., "A review of
electrohydrodynamic enhancement of heat transfer", Renewable and
Sustainable Energy Review, Vol. 11, pp. 858-876, 2007.
[2] Molki, M., Bhamidipati, K., "Enhancement of convective heat transfer in
the developing region of circular tubes using corona wind", International
Journal of Heat and Mass Transfer, Vol. 47, pp. 4301-4314, 2004.
[3] Sadek, H., Robinson, A.J., Cotton, J.S., Ching, C.Y., Shoukri, M.,
"Electrohydrodynamic enhancement of in-tube convective condensation
heat transfer", International Journal of Heat and Mass Transfer, Vol. 49,
pp. 1647-1657, 2006
[4] Alemrajabi, A., Lai, F. C., "EHD-enhanced drying of partially wetted
glass beads", Drying Technology, Vol. 23, pp. 597-60923, 2005.
[5] Goodenough T.I.J., Goodenough P.W, Goodenough S.M. "The
efficiency of corona wind drying and its application to the food
industry", Journal of food engineering, Vol. 80, pp. 1233-1238, 2007.
[6] Lai, F.C., Huang, M., Wong, D. S., "EHD-Enhanced Water
Evaporation", Drying Technology, Vol. 22, pp. 595-606, 2004.
[7] Lai, F.C., Sharma, R.K., "EHD-enhanced drying with multiple needle
electrode", Journal of Electrostatics, Vol. 63, pp. 223-237, 2005.
[8] Chen, Y.H., Barthakur, N.N., "Electrohydrodynamic drying of potato
slabs", Journal of Food Engineering, Vol. 23, pp. 107-119, 1994.
[9] Barthakur, N.N., "Electrohydrodynamic enhancement of evaporation
from Nacl solutions", Desalination, Vol. 78, pp. 455-465, 1990.
[10] Rashkovan, A., Sher, E., & Kalman, H. "Experimental optimization of
an electric blower by corona wind", Applied Thermal Engineering, Vol.
22, 1587-1599, 2002.
[11] Stuetzer, M., "Ion Drag Presuure Generation", Journal of Applied
Physics, Vol. 30, pp. 984-994, 1959.
[12] Kamkari, B. "Experimental Investigation of Water Evaporation
Enhancement Using Electrohydro-dynamics", M.Sc. thesis, Department
of Mechanical Engineering, Isfahan University of Technology, 2008.
[13] Sadek, S., Fax, E., Hurwitz, M.,"The influence of electric fields on
convective heat and mass transfer from a horizontal surface under force
convection", journal of heat transfer, Vol. 94, pp. 144-148, 1972.
[1] Laohalertdechaa, S., Naphonb, P., Wongwises, S., "A review of
electrohydrodynamic enhancement of heat transfer", Renewable and
Sustainable Energy Review, Vol. 11, pp. 858-876, 2007.
[2] Molki, M., Bhamidipati, K., "Enhancement of convective heat transfer in
the developing region of circular tubes using corona wind", International
Journal of Heat and Mass Transfer, Vol. 47, pp. 4301-4314, 2004.
[3] Sadek, H., Robinson, A.J., Cotton, J.S., Ching, C.Y., Shoukri, M.,
"Electrohydrodynamic enhancement of in-tube convective condensation
heat transfer", International Journal of Heat and Mass Transfer, Vol. 49,
pp. 1647-1657, 2006
[4] Alemrajabi, A., Lai, F. C., "EHD-enhanced drying of partially wetted
glass beads", Drying Technology, Vol. 23, pp. 597-60923, 2005.
[5] Goodenough T.I.J., Goodenough P.W, Goodenough S.M. "The
efficiency of corona wind drying and its application to the food
industry", Journal of food engineering, Vol. 80, pp. 1233-1238, 2007.
[6] Lai, F.C., Huang, M., Wong, D. S., "EHD-Enhanced Water
Evaporation", Drying Technology, Vol. 22, pp. 595-606, 2004.
[7] Lai, F.C., Sharma, R.K., "EHD-enhanced drying with multiple needle
electrode", Journal of Electrostatics, Vol. 63, pp. 223-237, 2005.
[8] Chen, Y.H., Barthakur, N.N., "Electrohydrodynamic drying of potato
slabs", Journal of Food Engineering, Vol. 23, pp. 107-119, 1994.
[9] Barthakur, N.N., "Electrohydrodynamic enhancement of evaporation
from Nacl solutions", Desalination, Vol. 78, pp. 455-465, 1990.
[10] Rashkovan, A., Sher, E., & Kalman, H. "Experimental optimization of
an electric blower by corona wind", Applied Thermal Engineering, Vol.
22, 1587-1599, 2002.
[11] Stuetzer, M., "Ion Drag Presuure Generation", Journal of Applied
Physics, Vol. 30, pp. 984-994, 1959.
[12] Kamkari, B. "Experimental Investigation of Water Evaporation
Enhancement Using Electrohydro-dynamics", M.Sc. thesis, Department
of Mechanical Engineering, Isfahan University of Technology, 2008.
[13] Sadek, S., Fax, E., Hurwitz, M.,"The influence of electric fields on
convective heat and mass transfer from a horizontal surface under force
convection", journal of heat transfer, Vol. 94, pp. 144-148, 1972.
@article{"International Journal of Engineering, Mathematical and Physical Sciences:56871", author = "R.Karami and B.Kamkari and K.Kashefi", title = "Investigation of Corona wind Effect on Heat and Mass Transfer Enhancement", abstract = "Applying corona wind as a novel technique can lead
to a great level of heat and mass transfer augmentation by using very
small amount of energy. Enhancement of forced flow evaporation
rate by applying electric field (corona wind) has been experimentally
evaluated in this study. Corona wind produced by a fine wire
electrode which is charged with positive high DC voltage impinges
to water surface and leads to evaporation enhancement by disturbing
the saturated air layer over water surface. The study was focused on
the effect of corona wind velocity, electrode spacing and air flow
velocity on the level of evaporation enhancement. Two sets of
experiments, i.e. with and without electric field, have been
conducted. Data obtained from the first experiment were used as
reference for evaluation of evaporation enhancement at the presence
of electric field. Applied voltages ranged from corona threshold
voltage to spark over voltage at 1 kV increments. The results showed
that corona wind has great enhancement effect on water evaporation
rate, but its effectiveness gradually diminishes by increasing air flow
velocity. Maximum enhancements were 7.3 and 3.6 for air velocities
of 0.125 and 1.75 m/s, respectively.", keywords = "Electrohydodynamics (EHD), corona wind, high
electric field, Evaporation enhancement", volume = "5", number = "10", pages = "1607-7", }