Browsing by Author "Schiebe, Frank R."

Now showing 1 - 8 of 8
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    An Evaluation of Acoustic Techniques for Measuring Gas Bubble Size Distributions in Cavitation Research
    (St. Anthony Falls Laboratory, 1971-05) Schiebe, Frank R.; Killen, John
    The acoustic tone burst attenuation technique for measuring the gas bubble size distribution in water was critically reviewed. The findings reveal that the usefulness of the technique is limited to the bubble volume concentration range between 0.03 and 1.0 parts per million. Furthermore, resolution between size ranges is probably not possible with sufficient accuracy for many purposes.
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    Experimental Study of Warm Water Flow into Impoundments Part I: Flow and Heat Exchange Near a Surface Outlet in Two-Dimensional Flow
    (St. Anthony Falls Laboratory, 1968-12) Stefan, Heinz G.; Schiebe, Frank R.
    The largest single industrial use of water in the United States is for cooling purposes. Large quantities of the resulting warm water are discharged into natural bodies of water. The flow pattern of the warmer water in the colder recipient can be controlled to a certain extent by the outlet design. The following study was undertaken to show some aspects of the flow of warm water into a colder body of water. There is a substantial difference between the flow of cooling water into a flowing stream and into a stagnant impoundment. Only the latter case was considered. The outlet was an open channel discharging the warm water at the water surface of the impoundment.
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    Experimental Study of Warm Water Flow into Impoundments Part II: Temperature and Velocity Instrumentation and Data Processing for the Three-Dimensional Flow Experiments
    (St. Anthony Falls Laboratory, 1968-12) Schiebe, Frank R.; Stefan, Heinz G.; Hayakawa, Norio
    Experimental investigations of thermal pollution problems in three dimensional hydraulic models pose some difficult instrumentation problems, The following is a description of instruments and procedures used at the St. Anthony Falls Hydraulic Laboratory, University of Minnesota, during a study of cooling water flow from a canal into an impoundment.
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    Experimental Study of Warm Water Flow into Impoundments Part III: Temperature and Velocity Fields Near a Surface Outlet in Three-Dimensional Flow
    (St. Anthony Falls Laboratory, 1968-12) Stefan, Heinz G.; Schiebe, Frank R.
    The investigation reported herein was undertaken in order to obtain some experimental infomation on the physical processes producing temperature and velocity distribution when heated water is discharged from a channel into a wide and deep tank. The outlet channel was built with a rectangular cross section. The receiving tank also had a rectangular cross section, but its depth and width were more than ten times larger than those of the channel. The facility was provided with instrumentation to measure temperature and velocity in a three-dimensional stratified flow.
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    Further Studies of Ventilated Cavities on Submerged Bodies
    (St. Anthony Falls Laboratory, 1964-10) Schiebe, Frank R.; Wetzel, Joseph M.
    This report supplements an earlier report describing experimental studies conducted to determine the air requirements of ventilated cavities on hydrofoils and other submerged bodies in the vicinity of a free surface. Reentrant jet, trailing vortex, and pulsating cavities were observed. In the present report, primary attention was given to extending an analysis of the type reported by Cox and Clayden and later extended by Campbell and Hilborne for predicting the air requirements of trailing vortex type cavities and for obtaining pertinent experimental data. It was shown that good agreement with the experimental data was obtained by both theoretical and semiempirical expressions. Secondary attention was given to further verification of a correlation parameter previously derived for reentrant jet type cavities. The transition region between reentrant jet and trailing vortex cavities was also investigated. For some conditions, pulsating cavities were found in the transition region.
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    The Influence of Gas Nuclei Size Distribution on Transient Cavitation Near Inception
    (St. Anthony Falls Laboratory, 1969-05) Schiebe, Frank R.
    This report concerns research on the problem of transient cavitation on hydrodynamic bodies near inception conditions. A probabilistic model of the process is presented. The experimental apparatus for providing the bubble size distribution, which is a necessary input to the probabilistic model, is described. An acoustic cavitation occurrence counting system that can be used to check on the output of the probabilistic model is also described. Experiments conducted on a half body in a 6-inch water tunnel test system achieved fair agreement between the predictions of the probabilistic model and the measurements by the occurrence counting technique in some cases.
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    Measurement of the Cavitation Susceptibility of Water Using Standard Bodies
    (St. Anthony Falls Laboratory, 1972-02) Schiebe, Frank R.
    This report covers feasibility study of the possibility of using the cavitation performance of standard bodies to measure the strength of water. An analytical cavitation model which utilizes a series of mathematically derived axisymmetric test bodies is combined with an acoustical cavitation occurrence counting instrumentation technique to establish an index which indicates the cavitation susceptibility of the test water in water tunnels. An equivalent size distribution of entrained microbubbles is proposed to represent the actual stream nuclei and to serve as the cavitation susceptibility index.
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    Surface Discharge of Heated Water, Part III: Field Measurements in a Three-Dimensional Jet-Type Surface Plume
    (St. Anthony Falls Laboratory, 1971-12) Stefan, Heinz G.; Schiebe, Frank R.
    Field tests were conducted to measure temperature, velocity, and current direction with depth at several locations in the cooling water plume of the Allen S. King power generating plant on Lake St. Croix. The results of the study compare favorably with data from laboratory and analytical models operated under similarity criteria, specifically geometry and densimetric Froude number similarity.