Drag reduction of a circular cylinder in an air-stream

Tsutsui, Takayuki; Igarashi, Tamotsu

doi:10.1016/s0167-6105(01)00199-4

Cited by 75 publications

(53 citation statements)

References 7 publications

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“…The longitudinal distance L between the center axes of the rod and the tube was 30 mm. The ratios d / D and L / D were 0.25 and 1.5, respectively, which correspond to the optimal conditions for heat transfer enhancement and drag reduction [4,5]. Figures 4 (a) and 4 (b) show the constant heat flux model and measurement system respectively, used in the present study.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 82%

“…It has been previously shown that heat transfer and drag can be respectively enhanced and reduced simply by positioning a rod upstream from a circular cylinder. [4,5] Under the optimum conditions, for a single circular cylinder with a rod positioned upstream, the overall heat transfer is increased by 40%, while the drag of the cylinder is reduced by 30%. Figure 2 (a) shows the Nusselt number (Nu) distribution.…”

Section: Introductionmentioning

confidence: 99%

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Heat transfer enhancement of a single row of tube

Tsutsui

2017

EPJ Web Conf.

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Abstract.A rod was positioned upstream of a circular cylinder to enhance its heat transfer and reduce its drag in air stream. The results are increasing the overall heat transfer by 40% over and reducing the drag by 30% the value for a single circular cylinder. In the present, this technique applied to a single row of tubes. Heat transfer enhancement and drag reduction are important factor for multi-tube heat exchanger. The present study investigated the heat transfer and surface pressure characteristics of each tube for single row of tubes under various numbers of tubes, pitch and Reynolds number. The tube diameter, D, was 20 mm, and the rod diameter was 5 mm. The distance between the center axes of the rod and the tube was 30mm.The Reynolds number based on D ranged from 5.3×10 3 to 2.1×10 4 . The result is that this technique is effective for heat transfer enhancement and drag reduction of row of tube.

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Section: Experimental Apparatus and Methodsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement of a single row of tube

Tsutsui

2017

EPJ Web Conf.

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“…Beberapa penelitian yang telah dilakukan yaitu aliran fluida yang melalui sebuah silinder sirkuler tunggal[1], silinder sirkuler yang dimodifikasi menjadi tipe D atau tipe I [2,3]. Aliran fluida yang melalui lebih dari satu silinder dengan ukuran yang berbeda dan tersusun tandem [4,5,6,7], semua hasil eksperimen tersebut digambarkan dalam sebuah album oleh Milton [8].…”

Section: Pendahuluanunclassified

“…Salah cara untuk mengurangi gaya hambat pada silinder utama adalah dengan menambah silinder kecil didepan sillinder utama yang dinamakan dengan passive control. Eksperimen yang sudah dilakukan dengan cara tersebut dapat mengurangi koefisien hambat sebesar 48% dibanding tanpa passive control [4], juga dilakukan dengan bilangan Reynolds yang berbeda yang hasilnya minimum pressure coefisien, C pmin yang terjadi akan semakin rendah [5].…”

Section: Pendahuluanunclassified

Solusi Numerik Dari Persamaan Navier-Stokes

Imron¹,

Suhariningsih²,

Widodo³

et al. 2011

LIMITS

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AbstrakInteraksi antara aliran fluida dengan suatu benda sering ditemui di alam. Aliran laminar maupun turbulen yang melewati suatu permukaan benda, maka partikel-partikel di sekitar permukaan bergerak lambat akibat gaya viskos, sehingga kecepatan partikel tersebut relatif nol. Pada paper ini akan mengkaji solusi numerik untuk menyelesaikan persamaan Navier-Stokes yang diterapkan pada persegi sirkuler yang dialiri fluida.

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“…Tsutsui and Igarashi [3] examined the reduction of drag on the circular cylinder air flow. In their study, they mounted the disturbance rod on the upstream cylinder.…”

Section: Introductionmentioning

confidence: 99%