EHD Flow Research Papers - Academia.edu (original) (raw)

The electric field distribution in an air gap between a wire-cylinder electrode configuration, has been studied by implementing Finite Element Analysis. The electrodes were assumed to be surrounded by air at normal conditions, while high dc voltage has been applied across them, with positive polarity at the wire. Numerical analysis on the maximum electric field intensity along the wire-cylinder gap axis, as well as on the potential distribution in the air surrounding the electrodes has been carried out, considering different geometrical characteristics of the electrodes. The applied mesh parameters were optimized, in terms of accuracy and processing power. The maximum field intensity was mainly associated with the wire radius r and the electrode gap length d. The cylindrical electrode radius R had a limited impact on the maximum electric field intensity but, on the other hand, it had a strong effect in the distribution of the electric field lines. Finally, a formula for the estimation of the maximum electric field intensity is proposed.

- by and +3
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- High Voltage Engineering, EHD Flow, EHD

The effect of the electrohydrodynamic system with various electrode layouts on a solar chimney pilot is investigated experimentally. A pilot setup was constructed which consisted of a chimney with 3 m height and 3 m collector diameter. The purpose of this research was to enhance the solar chimney performance with the electrohydrodynamic system for the parallel, radial, and symmetric layouts. By using of corona wind, the outlet fluid temperature is increased, and the outlet absorber is decreased. For the three layouts , the most growth in the outlet fluid temperature is 14 °C, which is observed in the parallel layout. Also, in the parallel array, the most outlet absorber temperature drop is 7 °C. The results show that parallel layout with six electrodes and 3 cm spacing between the electrodes has the best performance. Also, various hours of the day are studied and the best time for turning on the electrohydrodynamic system is 1:00 p.m. The electrohydrodynamic system makes an increase in the fluid velocity from 1.7 to 2.3 m s À1 , and this growth improves the performance about 28%.

- by Reza Daneshazarian
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- EHD Flow, Electrohydrodynamics, Heat transfer enhancement, Solar Chimney
- by J. Dekowski
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- Visualization, Particle Image Velocimetry, EHD Flow, Corona Discharge

An experimental study of the action of an intense electric field on the pool boiling of n-pentane is presented. By the application of a 25 kV/cm electric field strength, a threefold heat transfer enhancement is obtained. The effect of the... more

- by chaker zaghdoudi
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- Mechanical Engineering, Chemical Engineering, Heat Transfer, EHD Flow

This article deals with an experimental study of the in uence of a DC uniform electric eld on the nucleate boiling heat transfer. Electrohydrodynamic (EHD) effects on heat transfer coef cients for dielectric liquids are quantitatively... more

- by chaker zaghdoudi
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- Mechanical Engineering, EHD Flow, Pool Boiling, EHD Effects on Pool Boiling
- by Pietro Ferraro
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- Digital Holography, Microscopy, Inkjet printing, Lab On A Chip

MC Zaghdoudi * Unité de Recherche Mesures et Application Institut National des Sciences Appliquées & de Technologie (INSAT) Centre urbain nord, BP N°676, 1080 Tunis, Tunisia ... ّﺮﻤﺘﺴ ﻤﻟا ﻲﺋﺎ ﺑﺮﻬﻜﻟا لﺎ ﺠﻤﻟا ﺮﻴﺛﺄ ﺗ ﺔﺳارﺪﺑ ﺚﺤﺒﻟا اﺬه ﻢﺘﻬﻳ ﻲ... more

- by chaker zaghdoudi
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- Engineering, EHD Flow, Pool Boiling, EHD Effects on Pool Boiling

Characteristics of flow induced by electrohydrodynamic (EHD) gas pumps in circular pipe have been experimentally evaluated. Two tube diameters (61.8 mm and 127.8 mm) and two electrode gap distances (25 mm and 50 mm) have been considered. The gas pumps use eight evenly spaced emitting electrodes which are flush mounted on the tube wall. As such, flows induced by the pumps have a profile with a higher velocity near the wall and a lower velocity at the tube center. Experiments are conducted using positive corona discharge with voltage varying from 17.5 kV to 30 kV. The results show that the volume flow rate increases with the applied voltage but approaches an asymptotic value before sparkover takes place. From the present results, several important implications for the practical engineering applications are presented.

- by Yilma T Birhane
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- EHD Flow