Enhancement of convective heat transfer in the developing region of circular tubes using corona wind

Molki, Majid; Bhamidipati, Kanthi Latha

doi:10.1016/j.ijheatmasstransfer.2004.04.014

Cited by 52 publications

(10 citation statements)

References 28 publications

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“…Similar point-to-plane configurations have been studied by Kibler and Carter [5] as well as Owsenek and Seyed-Yagoobi [6] and Owsenek et al [7] The use of a corona discharge as a blower for duct flow between two plates (or fins) has also been suggested by Kalman and Sher [8] and Jewell-Larsen et al [9]. Forced convection enhancement has been studied extensively for both laminar and turbulent internal flows [10][11] [12]. Additionally, ionic-wind-enhanced heat transfer has been investigated by Ohadi et al [13] for a shell-and-tube heat exchanger and by Wangnipparnto et al [14] in a thermosyphon heat exchanger.…”

Section: Introductionmentioning

confidence: 87%

“…The measured average heat transfer coefficient as defined in Eq. (10) can be written as a summation of the free convection and forced convection components using the following relationship for transverse flows [29] The forced convection component here includes both the bulk flow and ionic wind components, while the free convection value was estimated using the correlation [30]   1/ 5 * 0.61  Nu Ra (12) where the Rayleigh number, Ra*, is based on the known heat flux at the flat plate.…”

Section: Corona Discharge Characterizationmentioning

confidence: 99%

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Enhancement of external forced convection by ionic wind

Maturana

Fisher

et al. 2008

International Journal of Heat and Mass Transfer

137

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An ionic wind is formed when air ions are accelerated by an electric field and exchange momentum with neutral air molecules, causing air flow. Because ionic winds can generate flow with no moving parts and have low power consumption, they offer an attractive method for enhancing convection heat transfer from a surface. In the present work, corona discharges are generated between a steel wire and copper-tape electrode pair on a flat plate, perpendicular to the bulk flow direction such that the ensuing ionic wind is in the direction of the bulk flow. The corona discharge current is characterized, and experimental measurements of heat transfer from a flat plate are reported. Infrared images demonstrate that the cooling occurs along the entire length of the wire, and local heat transfer coefficients are shown to increase by more than 200% above those obtained from bulk flow alone. The magnitude of the corona current and the heat flux on the flat plate are varied. The heat transfer coefficient is shown to be related to the fourth root of the corona current both analytically and experimentally, and heat transfer enhancement is seen to be a solely hydrodynamic effect.Variation of the spacing between electrodes demonstrates that while the local peak enhancement is largely unaffected, the area of heat transfer enhancement is dependent on this spacing.

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Section: Introductionmentioning

confidence: 87%

Section: Corona Discharge Characterizationmentioning

confidence: 99%

Enhancement of external forced convection by ionic wind

Maturana

Fisher

et al. 2008

International Journal of Heat and Mass Transfer

137

View full text Add to dashboard Cite

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“…Unlike conventional forms of airflow control (e.g., fans and blowers) which require large moving parts and are often slow and noisy, electric gas actuators have fast response times, small size, and no moving parts. Consequently, electric winds can address problems that challenge conventional forms of gas actuation: controlling boundary layer dynamics in aeronautics 1-3 , improving heat transfer in confined spaces [4][5][6] , modifying surface properties 7,8 , and removing atmospheric contaminants [9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Electric winds driven by time oscillating corona discharges

Drews

Cademartiri

Whitesides

et al. 2013

Journal of Applied Physics

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We investigate the formation of steady gas flows -so-called electric winds -created by point-plane corona discharges driven by time oscillating (ac) electric fields. By varying the magnitude and frequency of the applied field, we identify two distinct scaling regimes: (i) a low frequency (dc) regime and (ii) a high frequency (ac) regime. These experimental observations are reproduced and explained by a theoretical model describing the transport and recombination of ions surrounding the discharge and their contribution to the measured wind velocity. The two regimes differ in the spatial distribution of ions and in the process by which ions are consumed. Interestingly, we find that ac corona discharges generate strong electric forces localized near the tip of the point electrode, while dc corona discharges generate weaker forces distributed throughout the interelectrode region. Consequently, the velocity of the electric winds (>1 m/s) generated by ac discharges is largely independent of the position of the counter electrode.a Author to whom correspondence should be addressed. Electronic mail: kjmbishop@engr.psu.edu 2 The unified theoretical description of dc and ac electric winds presented here reconciles previous observations of winds driven by dc corona and ac dielectric barrier discharges; insights from the model should also prove useful in the design of other plasma actuators.

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“…Molki and Bhamidipati [13] performed an experimental investigation of heat transfer achieved by corona wind in the developed region inside the pipe. Based on their results, maximum and average increase in local heat transfer coefficients are 23% and 8%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Natural Convection in Inclined Channel in Presence of Electrostatic Field

Shabahangnia

Nasirivatan

Jafari

et al. 2014

Experimental Heat Transfer

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The influence of external electrohydrodynamic forces on natural convection from a flat plate has been studied. Temperature distribution in the aforementioned channel at a 5 458, 908, and 1508 angles in different 10-, 12-, and 15-kV electrostatic fields has been reviewed. Corona wind and the shape of the created vortex by electrohydrodynamics were detected. The results showed that heat transfer was enhanced by increasing the electrostatic field in all angles. In the presence of the field, enhancement of heat transfer of the plate at acute angles is better than for obtuse ones. The optimal angle in terms of heat transfer was 458, noting heat transfer improvement by 61%.

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Enhancement of convective heat transfer in the developing region of circular tubes using corona wind

Cited by 52 publications

References 28 publications

Enhancement of external forced convection by ionic wind

Enhancement of external forced convection by ionic wind

Electric winds driven by time oscillating corona discharges

Experimental Investigation of Natural Convection in Inclined Channel in Presence of Electrostatic Field

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