Cavitation and bubble dynamics by Christopher Earls Brennen PDF

By Christopher Earls Brennen

ISBN-10: 0195094093

ISBN-13: 9780195094091

This publication offers a coherent and unified remedy of the basic actual methods interested by bubble dynamics and the phenomenon of cavitation. Of curiosity to a variety of mechanical engineers, the examine of cavitation and bubbly flows is acceptable to subject matters starting from valve harm in hydroelectric apparatus, send propellers, and inner combustion engines to the functionality of generators and pumps of all sizes. Well-written and up to date, the booklet will end up crucial to engineers and scholars desiring a reference detailing the issues of cavitation and bubbly circulate.

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Changing the size of the device will alter not only the residence time effect but also the Reynolds number. Furthermore, the nuclei will now be a different size relative to the device than in the model. Changing the speed in an attempt to maintain Reynolds number scaling may only confuse the issue by further alterating the residence time. Moreover, changing the speed will also change the cavitation number. To recover the modeled condition, one must then change the pressure level, which may alter the nuclei content.

6 GROWTH BY MASS DIFFUSION In most of the circumstances considered in this chapter, it is assumed that the events occur too rapidly for significant mass transfer of contaminant gas to occur between the bubble and the liquid. 3 and elsewhere that the mass of contaminant gas in the bubble remained constant. It is convenient to reconsider this issue at this point, for the methods of analysis of mass diffusion will clearly be similar to those of thermal diffusion (Scriven 1959).

It may be of interest to note that cavitation itself is also a source of nuclei in many facilities. This is because air dissolved in the liquid will tend to come out of solution at low pressures and contribute a partial pressure of air to the contents of any macroscopic cavitation bubble. When that bubble is convected into regions of higher pressure and the vapor condenses, this leaves a small air bubble that only redissolves very slowly, if at all. This unforeseen phenomenon caused great trauma for the first water tunnels, which were modeled directly on wind tunnels.

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Cavitation and bubble dynamics by Christopher Earls Brennen


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