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Technical Briefs

Modeling the Natural Convection Heat Transfer and Dryout Heat Flux in a Porous Debris Bed

[+] Author and Article Information
R. Sinha

Department of Mechanical Engineering, S.P. College of Engineering, Mumbai 400058, India

A. K. Nayak

Reactor Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, Indiaarunths@barc.gov.in

B. R. Sehgal

Nuclear Power Safety Division, Royal Institute of Technology, Stockholm SE-10044, Sweden

J. Heat Transfer 130(10), 104503 (Aug 07, 2008) (5 pages) doi:10.1115/1.2952756 History: Received April 09, 2007; Revised March 28, 2008; Published August 07, 2008

An empirical model for natural convection heat transfer for film-boiling condition has been developed for volumetrically heated particulate debris beds when flooded with water at the top of the bed. The model has been derived from the quenching data generated in the POMECO facility located at KTH, Stockholm. A dryout model is also developed for countercurrent flooding limiting condition when the heat generating saturated debris bed is flooded with water from the top. The model is in good agreement with the experimental data over a wide range of particle size and porosity as compared to the existing models. The implication of the models with respect to quenching of porous debris bed formed during postulated severe accident condition is discussed.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Temperature distribution in the porous debris bed during the quenching test

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Figure 2

Relationship between Nux versus Rax for film boiling in porous debris bed

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Figure 3

Comparison of different models for dryout heat flux in porous debris bed

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Figure 4

Dependence of dryout heat flux with particle size and bed porosity

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Figure 5

Percentage error of different models versus particle size and bed porosity

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