3-D EHD Enhanced Natural Convection over a Horizontal Plate Flow with Optimal Design of a Needle Electrode System

The present study is intended to investigate the effect of electrohydrodynamic (EHD) enhanced heat transfer on natural convection flow. The flow is assumed to be three-dimensional, turbulent and steady. An experiment was carried out to verify the accuracy of the numerical results and to provide elec...

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Bibliographic Details
Published inEnergies (Basel) Vol. 11; no. 7; p. 1670
Main Authors Jang, Jiin-Yuh, Chen, Chun-Chung
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 2018
Subjects
Computational fluid dynamics
Convection
EHD
Electric properties
Electrodes
Electrohydrodynamics
Free convection
Heat transfer
needle electrode
Objective function
optimization
Power consumption
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Summary:The present study is intended to investigate the effect of electrohydrodynamic (EHD) enhanced heat transfer on natural convection flow. The flow is assumed to be three-dimensional, turbulent and steady. An experiment was carried out to verify the accuracy of the numerical results and to provide electric properties such as induced current and power consumption to be used as the criteria for the numerical solution procedures. An optimal analysis was carried out along with the simplified conjugate-gradient method, where the objective function was defined as the heat transfer enhancement per input power, which is maximized by searching for the optimum electrode pitch (SL) and height (H) combination. A search for the optimum electrode pitch (SL) and electrode height (H), ranging from 50 mm < SL < 200 mm and 15 mm < H < 55 mm, respectively, with V0 (12, 14, 16, 18 and 20 kV) and ΔT (33, 53 and 73 K), was performed, respectively. The results showed that the maximum heat transfer enhancement per power consumption reached 4.42–9.72.
ISSN:1996-1073
1996-1073
DOI:10.3390/en11071670