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Technical Briefs

# Wall Pressure Profile Around Cylindrical Rods in Yawed Gas Flow

[+] Author and Article Information
R. G. Marino, A. Clausse

CNEA-CONICET and Universidad Nacional del Centro, 7000 Tandil, Argentina

V. A. Herrero, G. Saravia

CITEDEF and Universidad Austral 1603 Villa Martelli, Argentina

N. Silin

CONICET-CNEA and Instituto Balseiro 8400 Bariloche, Argentina

J. Fluids Eng 133(7), 074502 (Jul 19, 2011) (4 pages) doi:10.1115/1.4004419 History: Received June 28, 2009; Revised June 10, 2011; Published July 19, 2011; Online July 19, 2011

## Abstract

The distribution of wall pressures in yawed flow through an array of cylindrical tubes inclined at different angles between 30° and 90° was experimentally studied using air at atmospheric pressure for 2290 ≤ Re ≤ 6100. The experiments show that the pressure coefficient is strongly influenced by the inclination angle, and only marginally affected by the flow rate within the tested range. The pressure behavior at the gap was calculated by assuming curved streamlines and inviscid flow, showing good agreement with measurements performed at the rod wall in the gap position.

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## Figures

Figure 1

Diagram of the experimental setup (lengths in mm)

Figure 2

Pressure coefficient for Re = 6100. Each curve corresponds to inclination angles α  = 30, 40, 50, 60, 70, 80, and 90 deg respect to the incident direction. The symmetry of the data for θ between 180° and 360° was checked.

Figure 3

Dependence of the pressure coefficient at the rear (○) and at θ=90∘ (•) with the inclination angle. The data is averaged over all the measured Reynolds numbers. The curve was calculated with Eq. 13.

Figure 4

Control volume ABCD at the gap between rods. The pressure force at A is -(pRdθ). The pressure force at C is (p+∂p∂ndn)(R+dn)dθ. The pressure force projection in direction n at B and D is -(pdndθ).

Figure 5

Pressure drop coefficient calculated with the velocity component normal to the cylinders axis. The data is averaged over all the measured Reynolds numbers. The curve corresponds to Eq. 15.

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