A 3-D EULERIAN-LAGRANGIAN MODEL OF DISPERSED FLOW FILM BOILING .2. ASSESSMENT USING QUASI-STEADY-STATE DATA AND COMPARISON WITH THE RESULTSOF 1-D ANALYSES
M. Andreani et G. Yadigaroglu, A 3-D EULERIAN-LAGRANGIAN MODEL OF DISPERSED FLOW FILM BOILING .2. ASSESSMENT USING QUASI-STEADY-STATE DATA AND COMPARISON WITH THE RESULTSOF 1-D ANALYSES, International journal of heat and mass transfer, 40(8), 1997, pp. 1773-1793
The hybrid Eulerian-Lagrangian model developed in the companion paper
(Part I) is assessed against several post-critical-heat-flux data sets
, obtained in both reflooding and slowly advancing quench front experi
ments using the hot patch technique. The calculated results are genera
lly in good agreement with the data; the good prediction of the high v
apour superheats is due to the low values of the interfacial heat tran
sfer which results from the droplet clustering around the centre of th
e channel For comparison with the usual one-dimensional approaches, a
one-dimensional mode! is also derived, which uses a single diameter re
presenting the droplet population, and its results are compared with t
hose obtained by the new three-dimensional model. For conditions of lo
w mass flux and not very high void fraction at the quench front, the I
-D analyses underpredict the vapour superheat as the calculated interf
acial heat transfers are presumedly too high. The limitations of the m
odels implemented in the large reactor safely computer codes are also
discussed. (C) 1997 Elsevier Science Ltd.