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Research Papers: Flows in Complex Systems

Characterization of a Superheated Water Jet Released Into Water Using Proper Orthogonal Decomposition Method

[+] Author and Article Information
Avick Sinha

Department of Mechanical Engineering,
Indian Institute of Technology Bombay,
Mumbai 400076, India
e-mail: avick.sinha@iitb.ac.in

Rajesh O. Chauhan

Department of Mechanical Engineering,
Indian Institute of Technology Bombay,
Mumbai 400076, India
e-mail: p16159@iitb.ac.in

Sridhar Balasubramanian

Department of Mechanical Engineering,
Indian Institute of Technology Bombay,
Mumbai 400076, India
e-mail: sridharb@iitb.ac.in

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 30, 2017; final manuscript received February 27, 2018; published online April 10, 2018. Assoc. Editor: Devesh Ranjan.

J. Fluids Eng 140(8), 081107 (Apr 10, 2018) (8 pages) Paper No: FE-17-1545; doi: 10.1115/1.4039521 History: Received August 30, 2017; Revised February 27, 2018

The external characteristics of a superheated water jet released into water at ambient conditions are dominated by the vapor bubble formation, which results in an unsteady flow dynamics. This hinders the use of classical methods to assess the mean flow and the turbulence characteristics. Here, the proper orthogonal decomposition (POD) technique was employed on the velocity measurements obtained using particle image velocimetry (PIV) to quantify the external characteristics of a superheated water jet released into water. This was done at three different inlet pressure ratios. From the energy modes obtained using the POD technique, it was observed that the first mode well represents the mean flow, while subsequent higher modes show the fluctuating nature. The phase-averaged properties were calculated by considering only the first mode. Unlike a canonical jet, the maximum value of the mean centerline velocity for a superheated jet occurs far downstream from the nozzle, at x/D ≈ 15, due to the thermal nonequilibrium in the jet attributed to the formation of vapor bubbles. The turbulent kinetic energy (TKE), size of the coherent structures (CS), and swirling strength showed a nonmonotonic decrease in the downstream direction, indicating that the vapor formation has significant influence on the jet dynamics. The novel aspect of this work is the use of POD technique for phase averaging, using which dynamics of a superheated jet have been quantified. The distribution of vapor bubbles in the flow field was also measured using the Shadowgraphy technique to substantiate the above observations.

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Figures

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Fig. 1

(a) Schematic diagram of the experimental setup and (b) PIV and Shadowgraphy region of interest (ROI) and the corresponding expansion and entrainment regime of the jet

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Fig. 2

Vorticity contour of the first 3 POD modes for different PR

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Fig. 9

(a) Variation of D32 along the downstream distance for different PR and (b) Percentage of bubbles count for varying PR and x

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Fig. 3

Normalized radial velocity profiles at different x/D for different PR

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Fig. 4

Normalized vorticity for different PR

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Fig. 5

Normalized centerline velocity profile for different PR

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Fig. 6

Normalized TKE for different PR

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Fig. 7

Vortex identification (CS) using Q-criterion

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Fig. 8

Effect of PR on swirling strength for (a) PR = 2.5, (b) PR = 2.0, and (c) PR = 1.5

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