Velocity Characteristics of Multiple Impinging Jets Through a Crossflow

[+] Author and Article Information
J. M. M. Barata, D. F. G. Durão, M. V. Heitor

Mechanical Engineering Department, Instituto Superior Técnico, Technical University of Lisbon, 1096 Lisbon Codex, Portugal

J. Fluids Eng 114(2), 231-239 (Jun 01, 1992) (9 pages) doi:10.1115/1.2910020 History: Received October 25, 1988; Online May 23, 2008


The mean and turbulent velocity characteristics of the flowfield resulting from the impingement of two and three jets against a wall through a low-velocity crossflow are quantified in detail making use of a laser-Doppler velocimeter and are discussed together with the visualization of the flow. The experiments have been carried out for a velocity ratio between the jets and the crossflow of 30, for a Reynolds number based on the jet exit of 105,000, and for the jet exit five jet-diameters above the ground plate, and provided a basis to improve knowledge of several related complex flow fields in engineering applications. The results characterize the turbulent transport typical of multiple impinging flows associated with a large penetration of the impinging jets through a crossflow, and quantify the formation of fountain flows due to collision of consecutive wall jets. The turbulence measurements include those of Reynolds shear stress and identify large effects of flow distortion on the turbulence structure parameters that determine the empirical constants in engineering models of turbulence.

Copyright © 1992 by The American Society of Mechanical Engineers
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