LIF measurement of turbulent horizontal dense jets in stagnant ambient

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer Pub Date : 2025-03-06 DOI:10.1016/j.ijheatmasstransfer.2025.126867

Sina Tahmooresi, Danial Goodarzi, Abdolmajid Mohammadian, Ioan Nistor

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引用次数: 0

Abstract

This study investigates the behavior of turbulent horizontal dense jets (THDJs) under varying bottom confinement scenarios using laser-induced fluorescence (LIF) techniques. The experiments aim to extend the current understanding of both mean and turbulent characteristics of these jets as they propagate streamwise up to 75 nozzle diameters (

75 D

) from the nozzle exit. The selected scenarios avoid typical wall jet and Coanda effects, focusing instead on medium and low bottom confinements. A comprehensive study on the concentration fluctuation field was carried out along and across the trajectories for multiple sections. Proper orthogonal decomposition (POD) analysis reveals that buoyancy-induced instabilities in the lower layer impede the formation of helical or axisymmetric structures. It turns out that contribution of turbulence in the most confined case (

H / D = 3

) was more than the rest of the scenarios.

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来源期刊

International Journal of Heat and Mass Transfer 工程技术-工程：机械

CiteScore

10.30

自引率

13.50%

发文量

1319

审稿时长

41 days

期刊介绍： International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems. Topics include: -New methods of measuring and/or correlating transport-property data -Energy engineering -Environmental applications of heat and/or mass transfer