ARTICLE:

• HEAT FLUX AND HEAT TRANSFER COEFFICIENT IN THE QUENCHING OF HOT SURFACES BY DROP IMPINGEMENT  download article

Gian Piero Celata
ITFD, Institute of Thermal-Fluid Dynamics ENEA, Italian Agency for the New Technologies, the Energy and the Environment, Rome, Italy

Maurizio Cumo
DINCE, University of Rome “La Sapienza”, Corso Vittorio Emanuele II, 244, Rome, Italy

A. Mariani
ENEA - Institute of Thermal-Fluid Dynamics, S. Maria di Galeria, Rome, Italy

L. Saraceno
ENEA - Institute of Thermal-Fluid Dynamics, S. Maria di Galeria, Rome, Italy

ABSTRACT

As an important part of a research programme on high temperature wall rewetting with drop impingiment, the work described in the present manuscript reports the evaluation of the wall heat flux and the heat transfer coefficient during the rewetting process of an electrically heated vertical plate, using water sprays characterized by a single drop diameter.
The heat flux and the heat transfer coefficient have been obtained from direct analysis of wall thermocouples readings during the rewetting of the high temperature wall.
Maximum values of the heat flux and the heat transfer coefficient are in the ranges 3,5÷6·10⁶ W/m² and 1,6÷3·10⁴ W/°C m², respectively.
The functional dependence of the heat flux and the heat transfer coefficient from tested thermal-hydraulic conditions and cooling modes has been evaluated.

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