@article {Arackal:2020:0736-2501:316,
title = "Acoustic characteristics of wall jets over a rough surface",
journal = "Noise Control Engineering Journal",
parent_itemid = "infobike://ince/ncej",
publishercode ="ince",
year = "2020",
volume = "68",
number = "5",
publication date ="2020-09-01T00:00:00",
pages = "316-327",
itemtype = "ARTICLE",
issn = "0736-2501",
url = "https://ince.publisher.ingentaconnect.com/content/ince/ncej/2020/00000068/00000005/art00001",
doi = "doi:10.3397/1/376827",
keyword = "21.6.4, 21.6.1",
author = "Arackal, Rahul S. and Jothi, T.J.S.",
abstract = "The effects of surface roughness on the noise emissions from wall jets with a plate length (L) of 40 cm are presented in this article. The surface roughness of the plate considered for the study is in the range of 5 to 19 mm, and the jet velocity at the nozzle exit is varied from 20
to 56 m/s. Acoustic measurements of the different roughness plate wall jets are carried out at a distance of 60 cm from the jet axis and compared with that of a smooth surface. The spectral results indicate that the noise emissions from rough surface wall jets are lower in the frequency range
(0.3{\^a}3.0 kHz), and the corresponding sound pressure levels are lower by around 5 dB compared to the noise from a smooth surface. Concurrently, the surface roughness is significant in generating higher noise levels by around 5 dB in the frequency range of 3 to 12 kHz compared
to its counterpart.",
}