Analisis Pengaruh Perubahan Kecepatan Udara Pada Saluran Penampang Persegi

Chandra Buana

Sari


The study is aimed at finding out the influence of hydraulic radius to equivalent length of fully developed flow; and identifying the characteristics of boundary layer ‘development’ when it reaches the fully developed area as a result of hydraulic radius-changes. The hydraulic radius of each was made different, but their height was the same; i.e. 200 mm. The first wind tunnel’s width was 270 mm, the second was 320 mm, and the other one was 400 mm. The results reveal that there has been a correlation between the thickness of boundary layer, the length of wind tunnel, and Reynolds figures, that is, δ/x = 2.1525/Re0.3254; and the correlation between equivalent length and fully developed area was obtained by Le/Dh=3.10 Re1/6. This suggests that the Blansius formula can be applied to determining an equivalent of fully developed area in squared-surface wind tunnels, but the constant changed from 4.4 to. 3.10.

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DOI: http://dx.doi.org/10.31963/sinergi.v7i2.1044

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