Experimental investigation of effect of spacer on two phase turbulent mixing rate in subchannels of pressure tube type BWR

Author:

Verma S. K.1,Sinha S. L.1,Chandraker D. K.2

Affiliation:

1. 1Mechanical Engineering Department, National Institute of Technology, Raipur, 492010, Chhattisgarh, India.

2. 2Reactor Design and Development Group, Bhabha Atomic Research Centre, Hall-7, Trombay, Trombay, Mumbai-400085, Maharashtra, India.

Abstract

AbstractTurbulent mixing rate between adjacent subchannels in a two-phase flow has been known to be strongly dependent on the flow pattern. The most important aspect of turbulent motion is that the velocity and pressure at a fixed point do not remain constant with time even in steady state but go through very irregular high frequency fluctuations. These fluctuations influence the diffusion of scalar and vector quantities. The Advanced Heavy Water Reactor (AHWR) is a vertical pressure tube type, heavy water moderated and boiling light water cooled natural circulation based reactor. The fuel bundle of AHWR contains 54 fuel rods set in three concentric rings of 12, 18 and 24 fuel rods. This fuel bundle is divided into number of imaginary interacting flow channel called subchannels. Alteration from single phase to two phase flow situation occurs in reactor rod bundle with raise in power. The two phase flow regimes like bubbly, slug-churn, and annular flow are generally encountered in reactor rod bundle. Prediction of thermal margin of the reactor has necessitated the investigation of turbulent mixing rate of coolant between these subchannels under these flow regimes. Thus, it is fundamental to estimate the effect of spacer grids on turbulent mixing between subchannels of AHWR rod bundle.

Publisher

Walter de Gruyter GmbH

Subject

Safety, Risk, Reliability and Quality,General Materials Science,Nuclear Energy and Engineering,Nuclear and High Energy Physics,Radiation

Reference34 articles.

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2. CROSSFLOW MIXING BETWEEN PARALLEL FLOW CHANNELS DURING BOILING. PART III. EFFECT OF SPACERS ON MIXING BETWEEN TWO CHANNELS.

3. Single-phase subchannel mixing in a simulated nuclear fuel assembly

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