The Effect of Electric Field on Heat and Mass Transfer

Wolny, A.; Kaniuk, R.

doi:10.1080/07373939608917092

Cited by 18 publications

(7 citation statements)

References 5 publications

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“…The reason why the evaporation rate becomes independent of the EHD number is because the effect of corona wind is largely suppressed by the high air velocity (u i ¼ 2.6 m/s). This is different from the result reported by Wolny and Kaniuk [9] in which they show that the water evaporation rate still increases with the applied voltage (i.e., the EHD number) under the cross-flow condition. It is important to note that the maximum crossflow velocity in their study was only 0.25 m/s.…”

Section: Ehd-enhanced Water Evaporation 603contrasting

confidence: 79%

“…These include the work of Sadek et al, [7] Wolny, [8] Wolny and Kaniuk [9] as well as Barthakur and Arnold. [10] However, the previous studies on EHD-enhanced water evaporation were either limited to a particular electrode (mostly a needle electrode [8][9][10] ) or a discharge polarity (negative corona [7] and positive corona [8,9] ). The main objective of the present study is to investigate the effect of corona wind on the water evaporation rate using wire and needle electrodes in both positive and negative polarities.…”

Section: Introductionmentioning

confidence: 96%

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EHD-Enhanced Water Evaporation

2004

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The enhancement of water evaporation by electrostatic field (corona wind) has been experimentally evaluated in this study. Two sets of experiments were conducted, with and without cross-flow, at an increment of 1 kV from the corona threshold voltage until the occurrence of sparkover. Two types of electrodes (wire and needle) were used. In addition, both positive and negative corona discharges were applied. The weight loss of water due to evaporation as well as the ambient temperature and humidity were measured. For each case a companion experiment was carried out simultaneously under the same ambient conditions but without the application of electric field. The result of which is used as a basis in the evaluation of the evaporation enhancement using electric field. Each experiment lasted for at least 5 h. With the application of electric field alone, the ORDER REPRINTS enhancement in the water evaporation rate increases with the applied voltage. With the introduction of cross-flow, the enhancement in the evaporation rate becomes nearly independent of the applied voltage and is close to the result obtained with cross-flow alone.

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Section: Ehd-enhanced Water Evaporation 603contrasting

confidence: 79%

Section: Introductionmentioning

confidence: 96%

EHD-Enhanced Water Evaporation

2004

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“…Large discrepancies were found when using the correlations of Wangnipparnto et al [11] and Karami et al [12], mainly because of the absence in the Sherwood or Nusselt number correlations, as well as the difference in the electrode system. In contrast, the simulated droplet diameter using the Wolny's [10] correlation agreed well with the experimental data because of the comprehensive consideration in the heat and mass transfer enhancement under the electric field. Thus, the Wolny's correlation [10] was selected in the present simulation of R134a charged droplet.…”

Section: supporting

confidence: 53%

“…Afterwards, further development and explanation of this phenomenon were made by researchers, where the macroscopic effect of the corona wind generation [8] and the microscopic effect of the orientational alignment of fluid molecules [9] induced by an electric field were widely regarded as the primary enhancement mechanism. For the former mechanism, several enhancement factor correlations [10][11][12] for the Nusselt and Sherwood numbers were proposed to evaluate the heat and mass transfer enhanced by the electric field. The objective of the present work is improving the traditional droplet evaporation model by considering the heat and mass transfer enhancement by the corona wind, droplet fragment by the Coulomb repulsion and droplet motion under the electric field.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Isolated Moving Charged Droplet Evaporation in Electrostatic Field with Highly Volatile R134a

Tian

Wang

Chen

2021

ICLASS

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Fundamental investigations of the charged droplet evaporation are helpful in enhancing the cooling capability and advancing the electrostatic spray model, whereas the corresponding data with the highly volatile R134a under electric field is very scarce. In this work, an improved evaporation model accounting for the effects of the corona wind, Coulombic fission and electric force under the electric field was developed and validated to evaluate the importance of the electric field on the moving charged R134a droplet evaporation for the first time. Results demonstrated that the electrostatic field can improve the charged droplet evaporation by means of the heat and mass transfer enhancement by the corona wind and counteracting the drag force from air. The droplet lifetime was shortened by 20.8% (from 105.6 ms to 83.6 ms) when the applied voltage increased from 0 kV to 10 kV. Exponential decay in the charged droplet lifetime when the applied voltage increased was observed.

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“…It was shown in early paper [21] that distilled water evaporated much faster in the presence of a high-voltage electric field in the direction normal to the water surface. Some details about the "Asakawa effect" and its applications can be found in [22][23][24][25]. Unfortunately, it is difficult to measure local increase in water evaporation in a small hot region just below the cluster.…”

Section: Experimental Results On Behavior Of Droplet Clustermentioning

confidence: 99%

On relative contribution of electrostatic and aerodynamic effects to dynamics of a levitating droplet cluster

Fedorets

Dombrovsky

Bormashenko

et al. 2019

International Journal of Heat and Mass Transfer

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New experimental results and their physical analysis are presented to clarify the behavior of a relatively stable self-arranged droplet cluster levitating over the locally heated water surface. An external electric field of both opposite directions leads to a significant increase in the rate of a condensational growth of droplets in the cluster. The experimental data are used to estimate a small electrical charge of single droplets and the attraction force of polarized droplets to the water layer. It is confirmed that the interaction between the droplets is governed by aerodynamic forces.

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The Effect of Electric Field on Heat and Mass Transfer

Cited by 18 publications

References 5 publications

EHD-Enhanced Water Evaporation

EHD-Enhanced Water Evaporation

Numerical Investigation on Isolated Moving Charged Droplet Evaporation in Electrostatic Field with Highly Volatile R134a

On relative contribution of electrostatic and aerodynamic effects to dynamics of a levitating droplet cluster

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