EFFECTS OF GRID SPACER WITH MIXING VANE ON ENTRAINMENTS AND DEPOSITIONS IN TWO-PHASE ANNULAR FLOWS

AKIMARO KAWAHARA; YUDAI HIRAKATA; SHOGO IMAMURA; MICHIO SADATOMI; YUTA SHIMOHARAI; MASATO ENDO

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자료유형: 학술저널

저자정보: AKIMARO KAWAHARA YUDAI HIRAKATA SHOGO IMAMURA MICHIO SADATOMI YUTA SHIMOHARAI MASATO ENDO

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제47권 제4호

발행연도: 2015.1

수록면: 389 - 397 (9page)

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The effects of mixing vanes (MVs) attached to a grid spacer on the characteristics of airewater annular flows were experimentally investigated. To know the effects, a grid spacerwith or without MV was inserted in a vertical circular pipe of 16-mm internal diameter. Forthree cases (i.e., no spacer, spacer without MV, and spacer with MV), the liquid filmthickness, liquid entrainment fraction, and deposition rate were measured by the constantcurrent method, single liquid film extraction method, and double liquid film extractionmethod, respectively. The MVs significantly promote the re-deposition of liquid droplets inthe gas core flow into the liquid film on the channel walls. The deposition mass transfercoefficient is three times higher for the spacer with MV than for the spacer without MV,even for cases 0.3-m downstream from the spacer. The liquid film thickness becomesthicker upstream and downstream for the spacer with MV, compared with the thicknessfor the spacer without MV and for the case with no spacer.

#Annular flow #Boiling water nuclear reactor #Deposition #Entrainment #Grid spacer #Mixing vane

참고문헌 (13)

참고문헌 신청

A. H. Govan / 1988 / An improved CHF modeling code / Proceedings of the Second UK National Heat Transfer Conference : 33 ~ 48

G. Feldhaus / 2002 / Annular flow experiments in rod bundles with spacers / Nucl. Eng. Des 213 : 199 ~ 207

I.I. Paleev / 1966 / Phenomena of liquid transfer in two-phase dispersed annular flow / Int. J. Heat Mass Transf 9 : 1089 ~ 1093

M. Damsohn / 2010 / Experimental studies of the effect of functional spacers to annular flow in subchannels of a BWR fuel element / Nucl. Eng. Des 240 : 3126 ~ 3144

M. Ishii / / Inception criteria for droplet entrainment in two-phase concurrent film flow / AIChE J 21 : 308 ~ 318

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