AN EXPERIMENTAL STUDY ON THE QUENCH FRONT VELOCITY AND TEMPERATURE DURING REWETTING OF A HOT VERTICAL ROD

Lymperea, Niki; Nikoglou, Andreas; Hinis, Evangelos

dc.contributor.author	Lymperea, Niki
dc.contributor.author	Nikoglou, Andreas
dc.contributor.author	Hinis, Evangelos
dc.date.accessioned	2022-02-25T10:33:25Z
dc.date.available	2022-02-25T10:33:25Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/54848
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.22546
dc.rights	Default License
dc.subject	Bottom flooding, Quench front, Rewetting	en
dc.title	AN EXPERIMENTAL STUDY ON THE QUENCH FRONT VELOCITY AND TEMPERATURE DURING REWETTING OF A HOT VERTICAL ROD	en
dc.type	Διάλεξη
dc.contributor.department	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Αρχιτεκτόνων Μηχανικών
heal.type	learningMaterial
heal.classification	Thermal Hydraulics	en
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2015-09-04
heal.abstract	This study presents experimental work upon the rewetting mechanism of bottom flooding of a vertical annular channel enclosing a concentrically heated rod. A one loop experimental rig with two phase water flow was used to simulate the dry out and the rewetting process at atmospheric conditions. Experiments have been conducted for water mass flow-rate within the range of 8.33 g·s-1 to 50.01 g·s-1, inlet water sub- cooling up to 25°C and initial surface temperature of the rod up to 550°C. Beyond the generic remark that the quench velocity increases with increasing inlet sub-cooling, increasing liquid mass flow-rate and decreasing initial wall temperature an investigation is conducted on the effect of the geometry of the annulus upon the quench velocity and the rewetting mechanisms by comparing the present data with data from previous experimental works. The comparison is carried out by employing the thermal properties and the geometrical characteristics of the rod via the dimensionless Peclet number and a modified Biot number. In addition, the effect of the experimental conditions on the quench temperature is examined and contrasted to previous top rewetting experiments. An empirical correlation for the prediction of the quench temperature with respect to the physical properties of the heated surface along with the experimental conditions is introduced.	en
heal.fullTextAvailability	false