Nuclear Power Institution of China

Chengdu, China

Nuclear Power Institution of China

Chengdu, China
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Zhang Y.-P.,Xi'an Jiaotong University | Tian W.-X.,Xi'an Jiaotong University | Qiu S.-Z.,Xi'an Jiaotong University | Su G.-H.,Xi'an Jiaotong University | And 3 more authors.
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2012

The CHF in rectangular narrow gaps have been investigated to develop a reasonable predictive model on CHF concerning surface orientation effects. The model is based on the counter current flow limitation (CCFL) by flooding of the flow entering gap. The results by the predictive model were compared with the experimental data by Kim and Suh (2003), and a good agreement was obtained in case of 1 mm and 2 mm gap size with surface inclination angle ranging from 10°-90°. However, when the surface inclination angle is less than 10° (nearly downward-facing position), the predictive model underestimated the CHF. The reason may be that the heating surface is covered by a stable vapor film and the vapor film is almost stationary, and that the effects of CCFL on CHF became smaller. A modified Katto-Kosho correlation was further proposed and it could predict the CHF well for inclination angle less than 10°. For gap size equaling to 5 mm and 10 mm, the predictive results were far larger than experimental data by Kim and Suh, which indicated that the validity of model based on CCFL controlled CHF was limited to gaps of less than 2 mm.


Huang Z.,Nuclear Power Institution of China | Xiao Z.,Nuclear Power Institution of China | Yan X.,Nuclear Power Institution of China | Zan Y.,Nuclear Power Institution of China | And 2 more authors.
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2015

A theory study on film interface stability on the wall of cyclone separator in viscous condition was performed in this paper. The dynamics boundary condition and kinematic boundary condition in the rotational flow field were obtained based on the stress analysis of film in viscous condition. Then the momentum equations and continuity equations of gas-liquid fluid were linearized by substitution of potential function. The dispersion relation of film interface wave in viscous condition was established by the combination of boundary conditions and the linearized equations. The judgment criteria for film interface stability was obtained. A code was developed according to the model of film motion and dispersion relation. The effect of liquid viscosity on the film interface stability in the cyclone separator was obtained based on the analysis of film interface stability in viscous condition. ©, 2015, Editorial Office of Nuclear Power Engineering. All right reserved.


Zhang L.,Nuclear Power Institution of China | Huang Y.,Nuclear Power Institution of China | Wang J.,Nuclear Power Institution of China | Song M.,Nuclear Power Institution of China | Zan Y.,Nuclear Power Institution of China
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2015

PIV (Particle Image Velocimetry) was used to study the velocity profile in the flow field and the wake characteristics of single air bubble rising in a vertical narrow rectangular channel. Effects of inlet average fluid velocity and bubble diameter on bubble rising velocity, wake structure and velocity profile were analyzed. Rising of the inlet average fluid velocity can reduce the wake disturbance induced by the rising bubble and simplify the wake structure. At a distance less than 1.0 W (W is the channel width, mm) behind the bubble tail, disturbance is greater compared to zone beyond 1.0 W from the bubble tail. © 2015, Yuan Zi Neng Chuban She. All right reserved.


Zhang L.,Nuclear Power Institution of China | Huang Y.,Nuclear Power Institution of China | Wang J.,Nuclear Power Institution of China | Song M.,Nuclear Power Institution of China | Zan Y.,Nuclear Power Institution of China
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2015

Wake characteristics of a single vapor bubble rising in a vertical narrow rectangular channel were studied by PIV, and the effects of bubble diameter and inlet average fluid velocity on bubble rising velocity, wake structure and velocity profile were analyzed. In addition, wake characteristic of single vapor bubbles was compared with that of single air bubbles. Results showed that the terminal rising velocity of vapor bubbles as function of the bubble diameter was a little different from that of air bubbles. Effects of bubble diameter and inlet average velocity on the wake and position with maximum longitudinal velocity in the wake were all similar to that of air bubbles. © 2015, Yuan Zi Neng Chuban She. All right reserved.

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