Imperial College London

Emeritus ProfessorGeoffreyHewitt

Faculty of EngineeringDepartment of Chemical Engineering

Emeritus Professor



+44 (0)20 7594 5562g.hewitt




Mrs Sarah Payne +44 (0)20 7594 5567




507aACE ExtensionSouth Kensington Campus






BibTex format

author = {Zhang, H and Hewitt, GF},
doi = {10.1016/j.nucengdes.2016.04.044},
journal = {Nuclear Engineering and Design},
pages = {73--80},
title = {New models of droplet deposition and entrainment for prediction of CHF in cylindrical rod bundles},
url = {},
volume = {305},
year = {2016}

RIS format (EndNote, RefMan)

AB - In this paper, we present a new set of model of droplet deposition and entrainment in cylindrical rod bundles based on the previously proposed model for annuli (effectively a "one-rod" bundle) (2016a). These models make it possible to evaluate the differences of the rates of droplet deposition and entrainment for the respective rods and for the outer tube by taking into account the geometrical characteristics of the rod bundles. Using these models, a phenomenological model to predict the CHF (critical heat flux) for upward annular flow in vertical rod bundles is described. The performance of the model is tested against the experimental data of Becker et al. (1964) for CHF in 3-rod and 7-rod bundles. These data include tests in which only the rods were heated and data for simultaneous uniform and non-uniform heating of the rods and the outer tube. It was shown that the predicted CHFs by the present model agree well with the experimental data and with the experimental observation that dryout occurred first on the outer rods in 7-rod bundles. It is expected that the methodology used will be generally applicable in the prediction of CHF in rod bundles.
AU - Zhang,H
AU - Hewitt,GF
DO - 10.1016/j.nucengdes.2016.04.044
EP - 80
PY - 2016///
SN - 0029-5493
SP - 73
TI - New models of droplet deposition and entrainment for prediction of CHF in cylindrical rod bundles
T2 - Nuclear Engineering and Design
UR -
VL - 305
ER -