TY - JOUR
T1 - High speed camera investigation of the impingement of single water droplets on oxidized high temperature surfaces
AU - Negeed, El Sayed R.
AU - Hidaka, S.
AU - Kohno, M.
AU - Takata, Y.
N1 - Funding Information:
The authors wish to express their sincere deep gratitude and deepest appreciation to Professor Dr. Ahmed H. MARIY (Atomic Energy Authority, Cairo, Egypt), Nobuya ISHIHARA and Keisuke TAGASHIRA (Department of Mechanical Engineering Science, Faculty of Engineering, Kyushu University, Fukuoka, Japan for their great efforts and continuous help. This work was supported partly by the Reactors Dept., Nuclear Research Center, Atomic Energy Authority, Cairo, Egypt and Department of Mechanical Engineering Science, Faculty of Engineering, Kyushu University, Fukuoka, Japan.
PY - 2013/1
Y1 - 2013/1
N2 - This study investigates the influence of oxide layer over the hot surfaces on the behavior of single droplets impacting the high temperature surfaces using high speed camera. In the present work, an experimental apparatus was installed where direct contact between mono-dispersed water droplet and solid hot surface in the presence of different values of oxide layer (4.5, 6.7, 9.4 and 12.6 μm) over the hot surface was experimentally investigated. The droplets size and its velocity were controlled independently. The results presented the effects of surface oxide layer, droplet velocity, droplet size and surface superheating on the hot solid-liquid contact wettability time and on the maximum droplet spread diameter on the hot surface. Empirical correlations are presented describing the hydrodynamic characteristics of an individual droplet impinging on a heated surface and concealing the affecting parameters for surface oxidation phenomena in such process. Also, the comparison between the obtained results at oxidation phenomena and the results due to others at non oxidation phenomena shows the effect of surface oxidation phenomena on the behavior of single droplet impacting the high temperature surface. These experimental observations provide the validation data required for multi-phase modeling of these phenomena by computational fluid dynamics (CFD) (e.g. Volume of Fluid (VOF) modeling) methods.
AB - This study investigates the influence of oxide layer over the hot surfaces on the behavior of single droplets impacting the high temperature surfaces using high speed camera. In the present work, an experimental apparatus was installed where direct contact between mono-dispersed water droplet and solid hot surface in the presence of different values of oxide layer (4.5, 6.7, 9.4 and 12.6 μm) over the hot surface was experimentally investigated. The droplets size and its velocity were controlled independently. The results presented the effects of surface oxide layer, droplet velocity, droplet size and surface superheating on the hot solid-liquid contact wettability time and on the maximum droplet spread diameter on the hot surface. Empirical correlations are presented describing the hydrodynamic characteristics of an individual droplet impinging on a heated surface and concealing the affecting parameters for surface oxidation phenomena in such process. Also, the comparison between the obtained results at oxidation phenomena and the results due to others at non oxidation phenomena shows the effect of surface oxidation phenomena on the behavior of single droplet impacting the high temperature surface. These experimental observations provide the validation data required for multi-phase modeling of these phenomena by computational fluid dynamics (CFD) (e.g. Volume of Fluid (VOF) modeling) methods.
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U2 - 10.1016/j.ijthermalsci.2012.07.014
DO - 10.1016/j.ijthermalsci.2012.07.014
M3 - Article
AN - SCOPUS:84867897939
SN - 1290-0729
VL - 63
SP - 1
EP - 14
JO - International Journal of Thermal Sciences
JF - International Journal of Thermal Sciences
ER -