Browsing by Author "Dahlin, Warren"
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Item Friction Factors for Helical Corrugated Aluminum Pipe(St. Anthony Falls Hydraulic Laboratory, 1969-12) Silberman, Edward; Dahlin, WarrenThe St. Anthony Falls Hydraulic Laboratory was engaged by the Aluminum Association to determine the friction factors for fully developed flow in helical corrugated pipe of several sizes.Item Further Studies of Friction Factors for Corrugated Aluminum Pipes Flowing Full(St. Anthony Falls Hydraulic Laboratory, 1971-04) Silberman, Edward; Dahlin, WarrenThe St. Anthony Falls Hydraulic Laboratory was engaged by Chamlin and Associates, Inc., of Peru, Illinois, to determine the friction factors for fully developed flow in several sizes of annular and helical corrugated pipes flowing full and to make qualitative observations of the pipe joint characteristics.Item Further Studies of Friction Factors for Helical Corrugated Aluminum Pipes with Re-Corrugated Annular Rings on Each End(St. Anthony Falls Hydraulic Laboratory, 1976-03) Dahlin, Warren; Silberman, EdwardThe St. Anthony Falls Hydraulic Laboratory was engaged by Kaiser Aluminum and Chemical Sales, Inc., to determine the friction factors for fully developed flow in 24 and 12 in. helical corrugated pipes flowing full and to make qualitative observations of the pipe joint characteristics. These pipes are unique in that the pipes were manufactured by customary procedures for helical pipe and then the ends re-corrugated with four annular rings using a special machine. The pipe characteristics are given in Fig. 1 and the physical features are shown in Figs. 2 and 3. The purpose of the re-corrugated pipe ends is to make it more convenient to connect the pipes together under field conditions.Item Hydraulic Model Studies for a Cooling Tower Circulating Water System Callaway Plant Unit - Union Electric Company(St. Anthony Falls Hydraulic Laboratory, 1977-04) Silberman, Edward; Dahlin, WarrenThe water basin under a large cooling tower can serve as a storage reservoir to balance flows through the plant condenser system, overcoming variations in evaporative losses and make up water availability. To use the storage capability effectively requires that some attention be given to the hydraulic design details of the basin and the channel leading from it to the circulating water pump pits. This model study has been undertaken to examine a design for that system for one of the cooling towers at the Callaway Plant Unit of the Union Electric Company.Item Hydraulic Model Studies for the Gury Hydroelectric Project Report on Spillway Cavitation Damage(St. Anthony Falls Hydraulic Laboratory, 1972-02) Ripken, John; Dahlin, WarrenThe Guri Hydroelectric Project of the Corporation Venezolana de Guayana (CVG) is located on the Caroni River in northeastern Venezuela. The project includes a water impoundment created by a concrete gravity type dam. The dam contains a three-chute concrete spillway, each chute consisting of an overflow gated crest, a steep chute, and a terminal flip bucket. The spillway flow is projected from the bucket in a high arching jet which plunges into the tailwater pool for final dissipation of its energy. Spillway flows were first released from the new structure early in 1969. Inspection of the spillway late in 1969 disclosed significant scouring or erosion of portions of the lips of the buckets and the ends of the side training walls. The Harza Engineering Company, which designed the structure and provided engineering assistance during the construction and initial operations, recommended to CVG that the damaged areas be restored with epoxy concrete and epoxy protective coatings. These repairs were made early in 1970 before the new seasonal water release. Subsequent inspections late in 1970 established that scouring had been renewed and even greater damage had been sustained than in the previous year. Field inspection suggested that the damage was due to the action of cavitation and that the damage might not be self-arresting and was thus potentially hazardous. Early in 1971 staff members of the Harza Engineering Company reviewed the available evidence with staff members of the St. Anthony Falls Hydraulic Laboratory of the University of Minnesota. As a consequence of these discussions the Laboratory was authorized in February 1971 to proceed with an experimental study. The objective of this study was to establish the mechanism of the damage and the modifications of the existing design or operations which would prevent and alleviate future damage. This report describes and summarizes the findings of the study.Item Model Studies of Dropshafts for the Chicago Underflow Plan Dry Weather Flow Dropshaft - Helix(St. Anthony Falls Hydraulic Laboratory, 1974-06) Anderson, Alvin G.; Dahlin, WarrenThe city of Chicago plans to construct a large number of dropshafts which will connect various parts of the existing surface sewer system to large underground storage tunnels. The St. Anthony Falls Hydraulic Laboratory has made model studies of various dropshafts proposed for use in the comprehensive plan. A particular dropshaft may be in use continuously (dry weather flow dropshaft) or during storms only (storm water dropshaft), or it may operate as a combination of the two. The mode of operation will have a considerable influence on the design for each type. The dropshafts will also vary in size depending on the discharge for the particular location. The function of a dropshaft is to convey the flow from the surface to the underground tunnels, which in some cases are over 200 ft beneath the surface. At the bottom of the dropshaft is a sump which has to withstand the impact forces of the falling water, separate the air from the water to prevent the air from entering the tunnels and return it to the surface, and convey the water to the tunnel at a reduced velocity. Various designs of dry weather flow dropshafts have been developed for study. One interesting variation was the incorporation of a helixin the dropshaft to convey the water downward and thus reduce the impact pressures and eroding forces in the sump; at the same time, for high tailwater elevations the head loss through the system was expeoted to be large and hence detrimental to its use. Because there are locations where this type of installation could be considered, De Leuw, Cather and Company initiated a project to study the flow in the helix in a dry weather flow dropshaft. Observations have been made on fluctuating and static pressures, air removal in the sump, and overall hydraulic characteristics of the structure.Item Model Studies of Dropshafts for the Tunnel and Reservoir Plan(St. Anthony Falls Hydraulic Laboratory, 1975-01) Anderson, Alvin G.; Dahlin, WarrenThis report describes the model studies carried out at the St. Anthony Falls Laboratory of the diversion structures and dropshafts to be incorporated into the Chicago Tunnel Reservoir Plan. The diversion structures will divert runoff from existing conduits at the surface to dropshafts used to transport the runoff down to deep tunnels which serve as temporary reservoirs. The model studies involved the construction and testing of two diversion structures, four vertical dry weather flow dropshafts, two sloping dry weather flow dropshafts, and three vertical storm water flow dropshafts. Also during the test program, various modifications were made on these basic models. The purpose of the model studies was to assist in the development of effective and practical diversion structures and dropshafts and to study their hydraulic operating characteristics for various flow conditions. Numerous modifications were made, with limited documentation of each, to develop an optimum design. When an optimum design had evolved, more detailed observations were made during which static and fluctuating pressures were recorded and black-and-white photos, colored slides, and colored movies were taken. Photographic documentation proved to be an excellent method of recording the overall hydraulic characteristics of the structures and the air entrainment and escape mechanisms.Item A Model Study of a Dike Enclosure at the Eastern End of Lake Erie(St. Anthony Falls Hydraulic Laboratory, 1969-04) Silberman, Edward; Dahlin, Warren; Paintal, AmreekThe Bethlehem Steel Corporation is faced with the problem of finding a disposal area for solid wastes, principally slag, from its steel plant at Lackawanna, New York. Whereas the slag was previously dumped freely into Lake Erie, such dumping is now considered undesirable. The company has proposed that a diked enclosure be built into the lake opposite its plant and that the wastes be dumped into this enclosure, thus preventing them from entering the lake. The company has estimated that the dike should enclose about 620 acres to accommodate its needs to some reasonable future date.Item Model Study of the Spillway for the Nader Shah Project Marun River development Khuzestan Water and Power Authority Ministry of Water and Power - Government of Iran(St. Anthony Falls Hydraulic Laboratory, 1973-03) Anderson, Alvin G.; Dahlin, WarrenA model of the spillway for the Nader Shah Projeot, a key element of the Marun River Development under the direction of the Khuzestan Water and Power Authority of the Government of Iran, was constructed. at a soale of 1:78.7 and tested at the St. Anthony Falls Hydraulic Laboratory of the University of Minnesota. The purpose of the model studies was to observe the nature of the flow in the approach, the spillway, and the tailrace and to provide data for the structural design. Initial observations were made of the flow characteristics in the tailrace for bucket exit angles of 10°, 20°, 30°, and 40°. Considering the energy dissipation and the velocities along the left bank of the tailrace, at the bucket, and by the toe of the dam, the bucket with a 40° exit angle was judged to be the optimum design. All further tests were made on the spillway with a 40° exit bucket. Approach flow conditions, spillway ratings, water surface profiles, both static and fluctuating pressures through the spillway, and erosion in the tailrace were observed. In addition to the data presented on the charts in this report, a photographic record in the form of still photos and color motion pictures was kept during the test program. A color-sound motion picture was produced covering the model studies.