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Title: Numerical evidence of an undisturbed region of flow in a turbulent rectangular submerged free jet
Authors: Boghi, A.
Angelino, Matteo
Gori, Fabio
Keywords: Submerged rectangular free jet
Turbulent flow
Undisturbed region of flow
Numerical simulation
Large Eddy Simulation
Self-Similarity law.
Issue Date: 2016
Publisher: © Taylor & Francis
Citation: BOGHI, A., ANGELINO, M. and GORI, F., 2016. Numerical evidence of an undisturbed region of flow in a turbulent rectangular submerged free jet. Numerical Heat Transfer, Part A: Applications: An International Journal of Computation and Methodology, 70 (1), pp. 14-29.
Abstract: 2016 Copyright © Taylor & Francis Group, LLC The evolution of turbulent rectangular submerged free jets is described in the literature by the presence of two regions of flow: the potential core region (PCR) and the fully developed region (FDR). However, experiments carried out in the last decade showed that a third region of flow is present, the undisturbed region of flow (URF), so-called in the average visualization, or the negligible disturbances flow (NDF) plus the small disturbances flow (SDF), so-called in the instant visualization. The URF is located between the slot exit and the beginning of the PCR. The main characteristics of URF, and NDF, are that velocity and turbulence profiles remain almost equal to those measured on the slot exit, and the height of the jet remains equal to the slot one. In the SDF the jet height undergoes small variations, i.e., contractions or expansions, but without formation of the vortex. To date, no numerical evidence of the presence of URF has been given by the literature. The present study, which concerns a two-dimensional jet, presents Large Eddy Simulations (LES), carried out at four Reynolds numbers, which are able to predict and characterize URF. The present numerical results are compared to previous theoretical approaches and confirm the presence of URF, between the slot exit and the PCR. Moreover, URF has a self-similar behavior and a new law for the evolution of the momentum is proposed.
Description: This paper is closed access until 2nd May 2017.
Version: Accepted for publication
DOI: 10.1080/10407782.2016.1139986
URI: https://dspace.lboro.ac.uk/2134/21430
Publisher Link: http://dx.doi.org/10.1080/10407782.2016.1139986
ISSN: 1040-7782
Appears in Collections:Closed Access (Aeronautical and Automotive Engineering)

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