[PDF] An Experimental And Theoretical Investigation Of Thermodynamic Effects On Developed Cavitation eBook

Author : Donald S. Weir
Publisher :
Page : 130 pages
File Size : 18,46 MB
Release : 1975
Category :
ISBN :

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The results of an experimental and theoretical investigation of thermodynamic effects on developed cavitation are presented. Distributions of temperature and pressure were measured for zero- and quarter-caliber ogives over a wide range of velocities, temperatures and cavity lengths. The semi-empirical entrainment theory is used to correlate the measured temperature depressions in the cavity. This theory relates the maximum temperature depression expressed in dimensionless form as the Jakob number in terms of the dimensionless numbers of Nusselt, Reynolds, Froude, and Peclet, and dimensionless cavity length. The results show that, in general, the temperature depression increases with cavity lengths and temperature.

Author : G. S Seidel (Jr)
Publisher :
Page : 170 pages
File Size : 35,40 MB
Release : 1966
Category :
ISBN :

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The effects of variations in temperature on desinent and developed cavitation were investigated theoretically and experimentally. The experimental portion of the investigation was carried out with hemispherical nosed models of 1/4-inch and 1/2-inch diameters in the NASA ultra-high speed cavitation tunnel. Velocities were varied from 44 to 130 feet per second and temperatures were varied from 80F to 180F. Cavitation numbers were found to increase with velocity and temperature for desinent cavitation. For developed cavity flows, the cavitation numbers were found to increase or remain constant with increasing temperature. For developed cavity flow, both increases and decreases in cavitation numbers with velocity were observed. A theoretical method of predicting cavitation numbers was developed from the quasi-static approach used previously in pump applications. The theory was applied to desinent and to developed cavitation. Thermodynamic effects in desinent cavitation were found to be important only at the lowest velocity and highest temperature investigated. In developed cavity flows, it was found that in addition to thermodynamic effects, gas effects may be important. (Author).

Author : Wade H. Shafer
Publisher : Springer Science & Business Media
Page : 307 pages
File Size : 43,82 MB
Release : 2013-11-21
Category : Science
ISBN : 1475757794

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Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis· seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac· tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 20 (thesis year 1975) a total of 10,374 theses titles from 28 Canadian and 239 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 20 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.

Author : Yves Lecoffre
Publisher : Routledge
Page : 424 pages
File Size : 33,66 MB
Release : 2021-10-08
Category : Science
ISBN : 1351462172

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This text deals with the concept that cavitation is the main limitation to the performance of hydraulic components. Topics covered include the vaporization of liquids due to high velocities or pressure fluctuations, and the effects of cavitation on the performances of rotary machinery. One chapter is devoted to cavitation noise which concerns many users, including surface ships and submarines, and the author finishes with some examples of the use of cavitation and subject-specific measuring techniques.

Author : V. K. Makarov
Publisher :
Page : 18 pages
File Size : 49,39 MB
Release : 1968
Category :
ISBN :

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A theoretical analysis of ultrasonic cavitation was made and experiments were conducted on acoustical measurements under cavitation conditions. An equation for the critical radius of a gas nucleus forming in liquids under metastable thermodynamic conditions was obtained. An equation is also given for the total volume of gas nuclei formed during cavitation at a frequency of 20 Kc in the temperature range 10-60C, for different molal air contents dissolved in water. Experimental results showed that cavitation was highly dependent on the gas content of the liquid. (Author).