Intensification of the evaporation process by electric field

Wolny, A.

doi:10.1016/0009-2509(92)80005-w

Cited by 17 publications

(4 citation statements)

References 4 publications

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“…This observation was in accordance with Lai et al [3], who suggested that an increase in EHD number > 1 will improve the rate of drying but as the air velocity is increased and electric field intensity reduced, air velocity or inertial force will prevail over ion drag (EHD number <1) [24,25].…”

Section: Response Surface Analysissupporting

confidence: 88%

Electrohydrodynamic drying of sand

et al. 2016

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This study analyzes the electrohydrodynamic (EHD) drying characteristics of sand.Effect of process parameters (independent variables) including air speed, electrode gap and applied voltage on drying kinetics and dependent variables including percentage water removed (%), Sherwood number, EHD number and specific energy consumed (kJ·kg -1 ) were also investigated using a central composite design and response surface methodology. Maximum drying was obtained for process parameter combination of air speed (2 m·s -1 ), electrode gap (1.5 cm) and applied voltage (15 kV). Air speed and electric field intensity (ratio of applied voltage to electrode gap) were found to have significant effect on percentage water removed (%) and Sherwood number. In case of EHD number and specific energy consumed during the EHD drying process, all process Downloaded by [University of Nebraska, Lincoln] at 16:37 06 June 20162 parameters had significant effect on them. The specific energy consumed increased with an increase in applied voltage but reduced with an increase in air speed at any given applied voltage suggesting that the EHD drying process, in combination with cross-flow, will lead to higher drying rate and low energy consumption under ambient conditions. Regression models were also developed describing the relation between independent and dependent variables.

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Section: Response Surface Analysissupporting

confidence: 88%

Electrohydrodynamic drying of sand

et al. 2016

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“…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%

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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“…Electric field effects on intensification of heat transfer processes in general and of boiling in particular, are also well documented [37][38][39][40] and the mechanisms are generally well understood [41][42][43]. In nucleate boiling, for instance, not only are more bubbles released from the surface when an electric field is applied but these are also smaller than in its absence [42].…”

Section: Centrifugal Fieldsmentioning

confidence: 99%

Process Intensification: An Overview of Principles and Practice

Boodhoo

Harvey

2013

Process Intensification for Green Chemistry

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columns, static mixers. More recent developments include spinning disc reactor, oscillating flow reactor, loop reactors, spinning tube in tube reactor, heat exchange reactor, microchannel reactors, etc. Lately, it has become increasingly important for the chemical process industries not only to remain cost competitive but to do so in an environmentallyfriendly or "green" manner. It is fitting, therefore, that many of the processes based on the PI philosophy also enables clean technology to be practised. For instance, high selectivity operations in intensified reactors on their own will reduce or ideally eliminate the formation of unwanted by-products. Combining such intensified reactors with renewable energy sources such as solar energy would give even greater impetus to achieving these green processing targets. Figure 1. Classification of process intensification equipment and methods [2] 3. Fundamentals of chemical engineering operations 3.1. Reaction Engineering (APH)

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Intensification of the evaporation process by electric field

Cited by 17 publications

References 4 publications

Electrohydrodynamic drying of sand

Electrohydrodynamic drying of sand

EHD-Enhanced Water Evaporation

Process Intensification: An Overview of Principles and Practice

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