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Experimental study on nucleate boiling heat transfer enhancement using an electric field
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 Title & Authors
Experimental study on nucleate boiling heat transfer enhancement using an electric field
Gwon, Yeong-Cheol; Kim, Mu-Hwan; Gang, In-Sik;
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 Abstract
To understand EHD nucleate boiling heat transfer enhancement, EHD effects on R-113 nucleate boiling heat transfer in a non-uniform electric field were investigated. The pool boiling heat transfer and the dynamic behavior of bubbles in d.c./a.c. electric fields under a saturated or subcooled boiling were studied by using a plate-wire electrode and a high speed camera. From the pool boiling heat transfer study, the shift of the pool boiling curve, the increase of the heat transfer and the delay of ONB and CHF points to higher heat fluxes were observed. From the dynamic behavior of bubbles, it was observed that bubbles departed away from the whole surface of the heated wire in radial direction due to EHD effects by a nonuniform electric field. With increasing applied voltages, the bubble size decreased and the active nucleation site and the departure number of bubbles showed the different trend. The present study indicates that the EHD nucleate boiling heat transfer is closely connection with the dynamic behavior of bubbles and the secondary flow induced near the heated surface. Therefore, the basic studies on the bubble behavior such as bubble frequency, bubble diameter, bubble velocity and flow characteristics are necessary for complete understanding of the enhancement mechanism of the boiling heat transfer using an electric field.
 Keywords
Electrohydrodynamics;Electric Field;Nucleate Boiling;Heat Transfer Enhancement;Bubble Dynamics;
 Language
Korean
 Cited by
1.
핵비등에서 기포의 동특성에 대한 전기장의 효과,권영철;장근선;권정태;김무환;

설비공학논문집, 2000. vol.12. 11, pp.963-971
2.
일정 벽면 온도 조건에서 이성분 혼합물의 핵비등시 벽면 열유속 거동,배성원;이한춘;김무환;

대한기계학회논문집B, 2000. vol.24. 9, pp.1239-1246 crossref(new window)
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