2011
DOI: 10.1299/jfst.6.614
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Drag Reduction of T-junction Pipe Flow by Small Obstacles

Abstract: Flows in the T-junction of a counter-flow pipe are run counter to each other and they usually flow out vertically together. A flow separated from the junction corner forms separated vortex regions and they reduce the effective cross-sectional areas of the pipe, and this increases flow resistance, i.e., drag (pressure loss). The corner of the junction is generally rounded to prevent the flow from separating and to reduce drag. This method can reduce drag by 30% with a rounded radius of 0.1D (D: pipe inner diame… Show more

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Cited by 8 publications
(11 citation statements)
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“…When σ is closer to 0, the flow uniformity improves. For ER = 1.0, σ increases with increasing Re, regardless of the aspect ratio, and for ER = 2.0, σ has a value smaller than 1 for Re = 6.0×10 2 and approximately 1 for Re =1.0×10 3 and 1.5×10 3 . The increase of the outlet manifold volume enables fluid to be distributed equally into each duct.…”
mentioning
confidence: 89%
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“…When σ is closer to 0, the flow uniformity improves. For ER = 1.0, σ increases with increasing Re, regardless of the aspect ratio, and for ER = 2.0, σ has a value smaller than 1 for Re = 6.0×10 2 and approximately 1 for Re =1.0×10 3 and 1.5×10 3 . The increase of the outlet manifold volume enables fluid to be distributed equally into each duct.…”
mentioning
confidence: 89%
“…Variation of the wall static pressure coefficient C p for Re =1.0×10 3 . Volume expansion ratios for the outlet manifold for (a) ER = 1.0 and (b) ER = 2.0.…”
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confidence: 99%
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“…In an earlier study, we newly proposed a simple method to reduce the loss of a T-junction of the counter flow type by using a weir-shaped small obstacle for each wall of pipe 1 and pipe 2 (Ando et al, 2011) [Fig. 1(b)].…”
Section: Effects Of Flow Rate Ratio On Loss Reduction Of -Junction Pipementioning
confidence: 99%
“…Figures (c) and dshow the velocity vectors obtained by PIV in the case with and without obstacles, respectively. In these figures, the obstacle conditions in the case with obstacles are all (L/D, H/D) = (0.47, 0.30), which reduce the loss the most for flow rate ratio α = 0.5 (Ando et al, 2011).…”
Section: Flow Patternmentioning
confidence: 99%