EFFECTS OF WAVY CHANNEL ENTRANCE DESIGN ON STREAMWISE COUNTER-ROTATING VORTICES: A VISUALIZATION STUDY

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BUDIMAN A.C.; MITSUDHARMADI H.; BOUREMEL Y.; WINOTO S.H.; LOW H.T.

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Journal: JOURNAL OF APPLIED FLUID MECHANICS (JAFM) Year:2016 | Volume:9 | Issue:5 Page(s): 2161-2166

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Title

EFFECTS OF WAVY CHANNEL ENTRANCE DESIGN ON STREAMWISE COUNTER-ROTATING VORTICES: A VISUALIZATION STUDY

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Keywords

BOUNDARY-LAYER FLOW

SMOKE-WIRE FLOW VISUALIZATION

WAVY CHANNEL

Abstract

Two different channel entrance designs, code named Valley First (VF) and Peak First (PF), were experimentally visualized by means of smoke-wire visualization technique to observe their effects towards the stream wise counter-rotating vortices generated. The spanwise wavelength of the vortices was pre-set by modifying the leading edge. The investigation was carried out on the laminar BOUNDARY-LAYER FLOW in a rectangular channel with one-sided wavy surface that has amplitude a and wavelength l of 7.5 mm and 76 mm, respectively. The vortices in the channel with VF design preserve farther downstream than those on the PF design, which might be caused by the large favorable pressure gradient between the entrance flat plate and the first peak location. The counter-rotating vortices could still be observed at non-dimensionalized stream wise distance c (=x/l) =2.47 for Reynolds number Re (=UH/ν) =9900 in channel with VF design.For lower Re, the vortices could preserve further downstream. In contrast, in channel with PF design, the structures were only visible clearly up to approximately c=1.32 for Re=4700 and c=0.39 for Re=5200.

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APA: Copy

BUDIMAN, A.C., MITSUDHARMADI, H., BOUREMEL, Y., WINOTO, S.H., & LOW, H.T.. (2016). EFFECTS OF WAVY CHANNEL ENTRANCE DESIGN ON STREAMWISE COUNTER-ROTATING VORTICES: A VISUALIZATION STUDY. JOURNAL OF APPLIED FLUID MECHANICS (JAFM), 9(5), 2161-2166. SID. https://sid.ir/paper/307788/en

Vancouver: Copy

BUDIMAN A.C., MITSUDHARMADI H., BOUREMEL Y., WINOTO S.H., LOW H.T.. EFFECTS OF WAVY CHANNEL ENTRANCE DESIGN ON STREAMWISE COUNTER-ROTATING VORTICES: A VISUALIZATION STUDY. JOURNAL OF APPLIED FLUID MECHANICS (JAFM)[Internet]. 2016;9(5):2161-2166. Available from: https://sid.ir/paper/307788/en

IEEE: Copy

A.C. BUDIMAN, H. MITSUDHARMADI, Y. BOUREMEL, S.H. WINOTO, and H.T. LOW, “EFFECTS OF WAVY CHANNEL ENTRANCE DESIGN ON STREAMWISE COUNTER-ROTATING VORTICES: A VISUALIZATION STUDY,” JOURNAL OF APPLIED FLUID MECHANICS (JAFM), vol. 9, no. 5, pp. 2161–2166, 2016, [Online]. Available: https://sid.ir/paper/307788/en

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