Effect of Agar Jelly Coating in Rectangular Pipe to Flow Drag Reduction
Effect of Agar Jelly Coating in Rectangular Pipe to Flow Drag Reduction
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DOI：
10.18869/acadpub.jafm.73.241.26701
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发表时间：
2017-07
影响因子：
1
通讯作者：
Yanuar;Gunawan;K. T. Waskito;S. Ogata
中科院分区：
文献类型：
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作者：
Yanuar;Gunawan;K. T. Waskito;S. Ogata
添加剂聚合物可以通过流体运动和特性产生湍流阻尼，从而获得减阻现象。进行了测量，以调查在正方形和矩形水平管道添加剂琼脂溶液涂层的压力损失，与纵横比（e）= 1.0和0.5，分别。增加浓度范围高达2倍，减阻效果达到1.5倍。本研究分析是利用摩擦系数与雷诺数的关系，提出减阻现象。琼脂包被的效果延迟了过渡区。研究结果表明，在雷诺数约为2600时，使用浓度为20%和40%的1 mm厚琼脂涂层获得了约19%的最大减阻现象。
Drag reduction phenomena can be obtained using additive polymer that can generate turbulence damping by fluid movement and characteristic. Measurements were carried out to investigate pressure losses in square and rectangular horizontal ducts coating of additive Agar solution, with aspect ratios (e) = 1.0 and 0.5, respectively. The increment concentrations are ranged up to 2 times and drag reduction effect was obtained up to 1.5 times bigger. This research analysis was done using friction coefficients and Reynolds numbers relation to put forward drag reduction phenomena. The effect of Agar coating delayed the transition regime. The research results using 1 mm of thickness Agar coating with concentration 20% and 40% concentrations were obtained maximum drag reduction phenomena about 19% at the Reynolds number about 2,600.