THERMAL SCIENCE

International Scientific Journal

Yacine Halouane

,

Amina Mataoui

,

Farida Iachachene

TURBULENT HEAT TRANSFER FOR IMPINGING JET FLOWING INSIDE A CYLINDRICAL HOT CAVITY

ABSTRACT
Convective heat transfer from an isothermal hot cylindrical cavity due to a turbulent round jet impingement is investigated numerically. Three-dimensional turbulent flow is considered in this work. The Reynolds stress second order turbulence model with wall standard treatment is used for the turbulence predictions the problem parameters are the jet exit Reynolds number, ranging from 2x104 to 105and the normalized impinging distance to the cavity bottom and the jet exit Lf, ranging from 4 to 35. The computed flow patterns and isotherms for various combinations of these parameters are analyzed in order to understand the effect of the cavity confinement on the heat transfer phenomena. The flow in the cavity is divided into three parts, the area of free jet, and the area of the jet interaction with the reverse flow and the semi-quiescent flow in the region of the cavity bottom. The distribution of the local and mean Nusselt numbers along the cavity walls for above combinations of the flow parameters are detailed. Results are compared against to corresponding cases for impinging jet on a plate for the case of the bottom wall. The analysis reveals that the average Nusselt number increases considerably with the jet exit Reynolds number. Finally, it was found that the average Nusselt number at the stagnation point could be correlated by a relationship in the form Nu=f(Lf,Re).
KEYWORDS
round jet, cylindrical cavity, turbulence, thermal effect, finite volume method, nusselt number
PAPER SUBMITTED: 2012-10-01
PAPER REVISED: 2013-05-30
PAPER ACCEPTED: 2013-06-21
PUBLISHED ONLINE: 2013-07-06
DOI REFERENCE: https://doi.org/10.2298/TSCI121001092H
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE Issue 1, PAGES [141 - 154]
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Turbulent heat transfer for impinging jet flowing inside a cylindrical hot cavity

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