|Table of Contents|

EHD Enhancement of Boiling Heat Transfer in-tube Using Cylindrical-rod and Flat Bar Electrodes


Research Field:
Publishing date:


EHD Enhancement of Boiling Heat Transfer in-tube Using Cylindrical-rod and Flat Bar Electrodes
L IU Yong-qi1 L I Ru-i yang2 YU Hong-ling2 WANG Fa-gang3 WANG Yan-x ia1
1.College of Traffic and Vehicle Engineering,Shandong University of Technology,Zibo 255049,China;2.College of Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;3.Office of Science and Technology,Shandong University of Technology,Zibo 255049,China
electrohydrodynam ics hea t transfer enhancement boiling heat transfer electric fie ld electrode con figuration
TK 124
Basic experiments are performed to investigate EHD ( E lectrohydrodynam ics) enhancement o f bo iling heat transfer forR- 123 in a vert ica l tube using the cylindrica-l rod and flat bar electrodes. The test rig consists of a vertica lmounted tube-in-tube heat exchangerw ith hotw ater f low ing in the outer tube and the test refrigerant flow ing in the inner one in wh ich two e lectrodes aremounted respective ly. E lectric f ie ld streng th ranges from 0 to 2. 133MV /m, and heat flux ranges from 115 to 10 kW /m2. Uncerta inty of the heat transfer coeffic ients is ? 917% , and that o f the enhancemen t facto rs is ? 1212% . It is demonstrated tha t the max imum enhancemen t factors o f two electrodes are about the same, but the average electric field strength and the energy consumption atw hich themaximum enhancem ent factors occurr for the flat bar e lectrode are low er than those of the cy lindrica-l rod electrode. The experimental phenomena are ana lyzed and d iscussed in v iew of the effect of electric field on grow th rate, departure and movement behav iors o f bubbles.


[ 1] 李瑞阳, 施伯红, 郁鸿凌, 等. EHD强化水平管外沸 腾换热的试验研究[ J]. 工程热物理学报, 2000, 21 ( 1): 97- 100.
[ 2] 刘永启, 李瑞阳, 郁鸿凌, 等. 圆柱形和三角形电极 EHD强化管内沸腾换热的试验研究[ J]. 清华大学 学报, 2003, 43( 12): 1 683- 1 686.
[ 3] Cheung K H, OhaddiM M, Dessiatoun S, et a.l EHDenhanced bo iling coeffic ients and v isua lization of R134a over enhanced tubes [ J]. Trans ASME, J H eat Transfer, 1997, 119: 332- 338.
[ 4] Ka ray iann is T G, Xu Y. E lec tric field e ffect in bo iling heat transfer ( Pa rt B) : E lec trode geom e try [ J]. J Enhanced H ea t Transper, 1998, 5: 231- 247.
[ 5] Paschkew itz J S, Pratt DM. E lectrodynam ica lly ( EHD) hea t transfer enhancement in an av iation work ing flu id: Effect of e lectrodematerial and polarity [ J]. J Enhanced H eat Transper, 2000, 7: 371- 383.


Last Update: 2006-06-30