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Research Papers: Fundamental Issues and Canonical Flows

Under-Expanded Gaseous Flow at a Straight Micro-Tube Exit

[+] Author and Article Information
Takahiro Yoshimaru

Department of Mechanical Engineering,
Tokyo Metropolitan University,
1-1 Minami-Osawa, Hachioji,
Tokyo 192-0397, Japan
e-mail: restofstory4@gmail.com

Yutaka Asako

ASME Fellow
Department of Mechanical Engineering,
Tokyo Metropolitan University,
1-1 Minami-Osawa, Hachioji,
Tokyo 192-0397, Japan
e-mail: asako@tmu.ac.jp

Toru Yamada

Department of Energy Sciences,
Lund University,
Box 118, SE-221 00,
Lund, Sweden
e-mail: Toru.Yamada@energy.lth.se

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 2, 2013; final manuscript received February 20, 2014; published online May 19, 2014. Assoc. Editor: Daniel Attinger.

J. Fluids Eng 136(8), 081204 (May 19, 2014) (7 pages) Paper No: FE-13-1583; doi: 10.1115/1.4026958 History: Received October 02, 2013; Revised February 20, 2014

This paper focuses on under-expanded gaseous flow at a straight micro-tube exit. The pitot total pressure of gas flow (jet) in the downstream region from a straight micro-tube exit was measured by a total pressure pitot tube to accumulate data for validation of numerical results. A micro-tube of 495μm in diameter and 56.3 mm in length and a total pressure pitot tube of 100 μm in outer diameter were used. The pitot total pressure was measured at intervals of 0.1 mm in both the flow and radial directions. The measurement was done for the mass flow rates of 9.71 × 10−5kg/s and 1.46 × 10−4kg/s. The data were accumulated for validation of the numerical results to reveal the characteristics of the under-expanded gas flow at the exit of a micro-tube. Comparisons were conducted for numerical results of corresponding cases and a slight discrepancy can be seen between numerical and experimentally measured pitot total pressures.

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Figures

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Fig. 1

Experimental setup

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Fig. 2

Micro-tube, end face and total pressure pitot tube

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Fig. 3

Measured pitot total pressure (pstg = 361.3 kPa)

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Fig. 4

Measured pitot total pressure (pstg = 519.3 kPa)

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Fig. 5

Schematic diagram of a problem

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Fig. 11

Displacement thickness

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Fig. 10

Pitot total pressure (pstg = 519.3 kPa)

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Fig. 9

Pitot total pressure (pstg = 361.3 kPa)

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Fig. 8

Pressure and Mach number contours near micro-tube exit (pstg = 519.3 kPa)

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Fig. 7

Pressure and Mach number contours near micro-tube exit (pstg = 361.3 kPa)

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Fig. 6

Grid alignment near micro-tube exit

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