Evaporation rate enhancement of water with air ions from a corona discharge

Barthakur, N. N.; Arnold, Neville P.

doi:10.1007/bf01320890

Cited by 26 publications

(9 citation statements)

References 15 publications

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“…3, the enhancement with the negative corona discharge is greater than that of the positive corona, which is consistent with the results reported by Barthakur and Arnold. [10] When comparing with the results obtained from the previous studies, [11,12] one finds that the enhancement in water evaporation reduces with the presence of glass beads, which is also consistent with many earlier observations (e.g., Keey [16] ) that the evaporation rate is higher with a free surface. In addition, one observes that the enhancement is smaller for glass beads with a smaller diameter.…”

supporting

confidence: 89%

“…This linear relationship is similar to the EHD-enhanced drying rate reported by the authors [11,12] and other investigators. [7,10] In general, it is observed that the water evaporation rate is greater at the presence of negative corona than that of positive corona. For a given polarity, the evaporation rate is greater for a needle electrode than that for a wire electrode.…”

Section: Resultsmentioning

confidence: 92%

“…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: 99%

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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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supporting

confidence: 89%

Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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EHD-Enhanced Water Evaporation

2004

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“…To the best of our knowledge, no discussion on the water evaporation from substrates during exposure to DBDs generated in atmospheric conditions was published so far. However, an increased rate of water evaporation, when exposed to an electric field, was reported by Barthakur and Arnold (1995), and Zhou and co-workers (2001), among others. In electrohydrodynamic drying (Singh 2012), the principal driving force for evaporation is an ion drag phenomenon.…”

Section: Wood Mass Loss During Ptmentioning

confidence: 82%

Treatment of wood with atmospheric plasma discharge: study of the treatment process, dynamic wettability and interactions with a waterborne coating

et al. 2020

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Plasma treatment is becoming a mature technique for modification of surfaces of various materials, including wood. A better insight in the treatment process and the impact of the plasma on properties of wood bulk are still needed. The study was performed on Norway spruce and common beech wood, as well as their thermally modified variations. The formations of the airborne discharge, as well as mass changes of the treated wood, were monitored. The impact of such treatment on wood-coating interaction was investigated by evaluating the dynamic wettability and penetration into wood. At the wood surface, plasma streamers were observed more intense on denser latewood regions. Wood mass loss was higher with increasing number of passes through the plasma discharge and was lower for thermally modified wood than for unmodified wood. Plasma treatment increased the surface free energy of all wood species and lowered the contact angles of a waterborne coating, these together indicating enhanced wettability after treatment. Finally, the distribution and penetration depth of the coating were studied with X-ray microtomography. It was found that the coating penetrated deeper into beech than into spruce wood. However, the treatment with plasma increased the penetration of the coating only into spruce wood.

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“…Asakawa [13] performed a pioneering study on the promotion and retardation of heat transfer by electric field. Some researchers [14,15] showed that, evaporation rates of water were increased about 4.0 -8.5 times in a high electric field.…”

Section: Introductionmentioning

confidence: 99%

Effect of needle number on drying rate of kiwi fruit in EHD drying process

Dalvand¹,

Mohtasebi²,

Rafiee³

2013

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Electrohydrodynamic (EHD) drying is a novel method of non-thermal processing. In this drying method, drying can be carried out using either AC or DC high voltages. The thermodynamic considerations regarding the lowering of temperature under EHD drying include rapid rates of evaporation and exothermic interaction of the electric field with a dielectric material. Multi-point and plate electrode systems are efficient in accelerating drying of agricultural materials. The electrode produces corona wind, which resembles a round jet, impinges and removes moisture from the surface. The enhancement of drying rate by corona discharge from needle electrodes has been experimentally evaluated in this study. Effects of three different categories, one needle, nine needles and seventeen needles on drying rate of kiwi fruit were studied, moreover in each category, Experiments were carried out using DC voltage levels of 6, 10.5 and 15 kV and field intensities 4.5 kV/cm. Results showed that the effect of needle number on drying rate was significant and drying rate of kiwi fruit reduced with increasing in needle numbers.

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Evaporation rate enhancement of water with air ions from a corona discharge

Cited by 26 publications

References 15 publications

EHD-Enhanced Water Evaporation

EHD-Enhanced Water Evaporation

Treatment of wood with atmospheric plasma discharge: study of the treatment process, dynamic wettability and interactions with a waterborne coating

Effect of needle number on drying rate of kiwi fruit in EHD drying process

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