Browsing by Author "Pilch, Meir"

Now showing 1 - 8 of 8
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    Construction on Permafrost
    (St. Anthony Falls Hydraulic Laboratory, 1952-05) Pilch, Meir
    This book contains general data on permafrost and characteristics of deformation of structures erected in permafrost regions. The surveys, design methods, and construction procedures involved are described in detail. The book deals primarily with industrial and public structures. The book is intended for engineers and construction technicians working in permafrost regions but may be of value also to persons engaged in related professions.
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    Design and Operation Characteristics of High-Lift Locks
    (St. Anthony Falls Hydraulic Laboratory, 1952-08) Pilch, Meir
    This compilation comprises five articles dealing with the design and operating characteristics of both actual and hypothetical navigation locks. The first article, the major work of this series, is a thorough analytical and experimental study of filling and emptying systems for locks, undertaken with the objective of determining the optimum design of a proposed lock. The second paper presents a detailed description of the design aspects and operation features of one of the large locks of the Amsterdam-Rhein Canal. The third article deals with the general design aspect$ and operation details of a large lock. The fourth article constitutes a brief historical survey of filling and emptying systems, with special emphasis on adaptation to high-lift locks. The final article analyzes general and specific aspects of segment and sector valves and gates for lock chambers and culverts.
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    Investigation of Airfield Drainage Arctic and Subarctic Regions Part II
    (St. Anthony Falls Hydraulic Laboratory, 1949-04) Pilch, Meir
    Many structures erected in zones of aggressive ground water are periodically flooded by the ground water penetrating through the floors and the walls; this occurrence creates complications and occasionally makes it impossible to use the structure. Frequently structures are erected in regions having a high groundwater table. To assure normal and uninterrupted use of buildings existing under these conditions, it is necessary to give particular consideration to problems pertaining to special waterproofing measures. It should be noted that the quality of the waterproofing depends not only on the kind and quality of the materials used but also, to a great extent, upon the quality of the workmanship.
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    Laboratory Wave-Generating Apparatus
    (St. Anthony Falls Hydraulic Laboratory, 1953-10) Pilch, Meir
    This comp11ation comprises four articles dealing with tile design and characteristics of wave-generating machinery. Part I, which is composed of the first three articles, defines the problems incidental to wave-generator operation and evaluates many machines currently in use. It also presents a theoretical analysis of wave generators, the results of which describe the wave generated and the forces acting upon the wave machine. In Part II a group of engineers at the Dauphin Hydraulic Laboratory (Neyrpic) relate in detail how they have managed to meet the design and motion requirements of laboratory wave generators. By way of illustration the authors describe three different laboratory installations for the study of waves or harbor problems. In conclusion, they indicate the necessary and feasible improvements in design and construction of wave-generating machines; most of these improvements have already been incorporated in prototypes and tested.
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    Non-Newtonian Pipe Friction Studies with Various Dilute Polymer Water Solutions
    (St. Anthony Falls Laboratory, 1964-06) Ripken, John F.; Pilch, Meir
    This study extends existing data on the frictional drag reducing influence of long-chain polymers in dilute water solutions. Studies were conducted with both fresh and sea water in capillary tubes and pipes with a size range of 100 diameters and covering the laminar, transition, and turbulent regimes with N↑Re up to 8 x 105. Fifteen types of test additives were used, including Polyhall, Polyox, Westco Guar, and fish slime. Test temperatures ranged from 40° to 85° F. Dilute solutions ranging down to 10 ppm concentration exhibited remarkable friction reductions at high shear rates as a near-laminar type of flow. Data correlation was hampered by diameter, temperature, and concentration effects not resolved by existing flow parameters based on power law theory. Shear degradation effects were evaluated.
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    Resistance to Flow in Two Types of Concrete Pipe
    (St. Anthony Falls Hydraulic Laboratory, 1960-12) Straub, Lorenz G.; Bowers, Charles A.; Pilch, Meir
    Experimental studies were performed on 24-in. and 36-in. concrete culvert pipe to determine the effect of interior surface finishes and joint irregularities on the frictional resistance of the pipe. Cast and vibrated pipe and machine-tamped pipe were used in the tests. The studies are grouped into several more or less related categories.
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    Selected Translatons from Transactions of the Institue of hydraulic Machines of the Karlsruhe Technical University
    (St. Anthony Falls Laboratory, 1948-09) Pilch, Meir
    The special installations for investigation of the details of the flow patterns in the machines are described separately in each article. Only the model test arrangement for turbines and pumps shall be described here.
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    Studies of the Reduction of Pipe Friction with the Non-Newtonian Additive CMC
    (St. Anthony Falls Hydraulic Laboratory, 1963-04) Ripken, John F.; Pilch, Meir
    This study extends existing data to better clarify the manner in which the addition of a small quantity of long-chain polymer chemical additive to water can remarkably reduce the frictional resistance to flow. The material sodium carboxymethylcellulose was added to fresh water and subjected to pipe friction tests under a wide range of shear rates, additive concentration, and temperature conditions. The frictional data are characterized by application of the power law expression for non-Newtonian fluids.