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EFFECTS OF A TURBULENT WALL JET OVER A NON-CONFINED BACKWARD-FACING STEP

Nicolas Lancial
Universite Lille Nord-de-France, F-59000 Lille. UVHC TEMPO/DF2T, F-59313 Valenciennes, France; Departement TecHnologie Et Moderation des Infrastructures du Systeme electrique (THEMIS) EDF R&D, 92140, Clamart, France

F. Beaubert
Universite Lille Nord-de-France, F-59000 Lille. UVHC TEMPO/DF2T, F-59313 Valenciennes, France

Souad Harmand
Thermique Ecoulement Mécanique MatériauxMise en Forme Production - TEMPO - Université de Valenciennes et du Hainaut Cambrésis, BP 59313 Valenciennes CEDEX 9, France

Thien Duy Nguyen
Department of Civil Engineering Ritsumeikan University 1-1-1 Noji Higashi, Kusatsu, Shiga, 525-8577, Japan; Universite Lille Nord-de-France, F-59000 Lille. UVHC TEMPO/DF2T, F-59313 Valenciennes, France

G. Rolland
Departement TecHnologie Et Moderation des Infrastructures du Systeme electrique (THEMIS) EDF R&D, 92140, Clamart, France

Résumé

Experimental and numerical analysis of a turbulent wall jet downstream of a non-confined backward-facing step are presented. An infrared camera was used to visualize a temperature map of the heated plate downstream the step. A hot wire was utilized to measure the instantaneous local velocity and some PIV/SPIV measures were performed to obtain instantaneous two and three dimensional vector fields. The main objective was to visualize and compare both the fluid flow and the heat transfer, by studying the skin friction coefficient Cf and the Nusselt number Nud. The latter is obtained by the calculation of the heat transfer coefficient, evaluated by inverse method. Both experimental data and numerical approach provide good agreement regarding the flow structure and thermal data for measuring the position and the value of characteristics scales in the recirculation zone. Similarities and differences are high-lighted in the paper compared to confined configurations.