The velocity field in the vicinity of a target surface with a turbulent slot jet impinging normally on it is examined. The impingement region is confined by means of a confinement plate that is flush with the slot and parallel to the impingement plate. The distance H of the impingement wall from the slot is varied from 2 to 9.2 slot widths. Jet Reynolds numbers (based on slot width B) of 10,000–30,000 are considered. Mean velocity and root mean square velocity measurements are carried out using hot-wire anemometry. A boundary layer probe is utilized in order to obtain measurements at a wall distance as close as 110 microns This corresponds to a distance of approximately in wall units and is found to be adequate in order to permit an estimate of wall shear under most conditions. The problems of hot wire interference with the wall and calibration at low velocities are solved by calibrating the probe in a known Blasius flow. With the exception of the stagnation region where shear could not be evaluated, it is found that velocity profiles follow a linear behavior in the viscous sublayer everywhere along the wall. Results indicate that the peak in normal stress occurs at to 0.04 at a distance six to eight jet widths away from the jet-axis.
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March 2001
Technical Papers
Near Wall Measurements for a Turbulent Impinging Slot Jet (Data Bank Contribution)1
Jiang Zhe, Graduate Research Assistant,
Jiang Zhe, Graduate Research Assistant
Department of Mechanical Engineering, Columbia University, New York, NY 10027
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Vijay Modi, Associate Professor
Vijay Modi, Associate Professor
Department of Mechanical Engineering, Columbia University, New York, NY 10027
Search for other works by this author on:
Jiang Zhe, Graduate Research Assistant
Department of Mechanical Engineering, Columbia University, New York, NY 10027
Vijay Modi, Associate Professor
Department of Mechanical Engineering, Columbia University, New York, NY 10027
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division May 26, 2000; revised manuscript received November 17, 2000. Associate Editor: K. Zaman.
J. Fluids Eng. Mar 2001, 123(1): 112-120 (9 pages)
Published Online: November 17, 2000
Article history
Received:
May 26, 2000
Revised:
November 17, 2000
Citation
Zhe, J., and Modi, V. (November 17, 2000). "Near Wall Measurements for a Turbulent Impinging Slot Jet (Data Bank Contribution." ASME. J. Fluids Eng. March 2001; 123(1): 112–120. https://doi.org/10.1115/1.1343085
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