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Technical Briefs

# Study of Submerged Jet for Suction of Fluid

[+] Author and Article Information
Sudhakar Subudhi

Department of Mechanical Engineering, National Institute of Technology Calicut, Kozhikode, India 673601subudhi@nitc.ac.in

K. R. Sreenivas

Engineering Mechanics Unit, JNCASR, Bangalore, India 560012krs@jncasr.ac.in

Jaywant H. Arakeri

Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India 560012jaywant@mecheng.iisc.ernet.in

J. Fluids Eng 134(9), 094502 (Aug 22, 2012) (6 pages) doi:10.1115/1.4007266 History: Received December 13, 2011; Revised June 26, 2012; Published August 22, 2012; Online August 22, 2012

## Abstract

This paper deals with the study of a submerged jet for the suction of unwanted fluid. This submerged jet is caused by the fluid coming out from a source. The presence of a sink in front of this source facilitates the suction of the fluid depending upon the source and sink flow rates, the axial and lateral separations of the source and sink, and the angle between the axes of the source and sink. The main purpose is the determination of the sink flow rate for $100%$ removal of the source fluid as a function of these parameters. The experiments have been carried using a source nozzle 6 mm in diameter and two sizes for the sink pipe diameter: 10 mm and 20 mm. The main diagnostics used are flow visualization using dye and particle image velocimetry (PIV). The dependence of the required suction flow rate to obtain $100%$ effectiveness on the suction tube diameter and angle is relatively weak compared to the lateral separation.

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## Figures

Figure 1

Geometrical configurations for the source-sink pair: dso is the diameter of the source pipe, dsi is the diameter of the sink pipe, Lh is the axial separation, Lv is the lateral separation, and θ is the suction angle w.r.t. the source discharge

Figure 2

Schematic diagram of the experimental setup: (1) Glass experimental tank, (2) five-liter aspirator bottle, (3) twenty-liter aspirator bottle, (4) plenum with nozzle, (5) sink pipe, (6) overhead tank, (7) tank for constant sink flow arrangement, and (8) drainage tank linked to the constant sink flow arrangement

Figure 3

Schematic diagram indicating different parameters for a jet

Figure 4

Vector plot for Lh=7 cm, Lv=0 cm, dsi=20 mm, and Qsi=53 ml/s

Figure 5

Variation of the mean velocity with the radius of the jet in the laminar portion of the jet

Figure 6

Flow visualization with KMnO4 dye for a submerged jet with no sink: Qso=12 ml/s, dso=6mm, and Re=3200

Figure 7

Variation of the jet widths with the axial distance for the no-sink case

Figure 8

Variation of the mean axial velocity with the axial distance for the no-sink case

Figure 9

Variation of the mean velocity with the radius of the jet

Figure 10

Variation of the volume flow rate with the axial distance for the no-sink case

Figure 11

Normalized volume or species flow rate in the jet versus radial distance. A Gaussian velocity profile is assumed. Here, Q and M are the total volume and species flow rates in the jet at any cross section, respectively; Qr and Mr are the volume and species flow rates through the circular cross section of radius r, respectively.

Figure 12

Visualization for Lv=2 cm and dsi=20 mm: (a) Lh=12 cm, Qsi=406 ml/s, and ɛ=1, and (b) Lh=15 cm, Qsi=440 ml/s, and ɛ=1

Figure 13

Sink flow rate versus horizontal separation plot for ɛ=1

Figure 14

Variation of the mean axial velocity with the axial distance for Lh=10 cm, Lv=0 cm, dsi=10 mm, and Qsi=89 ml/s

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