Bubble Generation During Low-gravity Fluid Handling Procedures PDF Download
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Author: Basil N. Antar
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Basil N. Antar
Publisher:
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Category :
Languages : en
Pages :
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Author: Salvatore Cezar Pais
Publisher:
ISBN:
Category :
Languages : en
Pages : 158
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721080311
Category :
Languages : en
Pages : 158
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The present work reports a study of bubble generation under reduced gravity conditions for both co-flow and cross-flow configurations. Experiments were performed aboard the DC-9 Reduced Gravity Aircraft at NASA Glenn Research Center, using an air-water system. Three different flow tube diameters were used: 1.27, 1.9, and 2.54 cm. Two different ratios of air injection nozzle to tube diameters were considered: 0.1 and 0.2. Gas and liquid volumetric flow rates were varied from 10 to 200 ml/s. It was experimentally observed that with increasing superficial liquid velocity, the bubbles generated decreased in size. The bubble diameter was shown to increase with increasing air injection nozzle diameters. As the tube diameter was increased, the size of the detached bubbles increased. Likewise, as the superficial liquid velocity was increased, the frequency of bubble formation increased and thus the time to detach forming bubbles decreased. Independent of the flow configuration (for either single nozzle or multiple nozzle gas injection), void fraction and hence flow regime transition can be controlled in a somewhat precise manner by solely varying the gas and liquid volumetric flow rates. On the other hand, it is observed that uniformity of bubble size can be controlled more accurately by using single nozzle gas injection than by using multiple port injection, since this latter system gives rise to unpredictable coalescence of adjacent bubbles. A theoretical model, based on an overall force balance, is employed to study single bubble generation in the dynamic and bubbly flow regime. Under conditions of reduced gravity, the gas momentum flux enhances bubble detachment; however, the surface tension forces at the nozzle tip inhibits bubble detachment. Liquid drag and inertia can act either as attaching or detaching force, depending on the relative velocity of the bubble with respect to the surrounding liquid. Predictions of the theoretical model compare well with performed expe
Author:
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 232
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Author: R. Shankar Subramanian
Publisher: Cambridge University Press
ISBN: 9780521496056
Category : Science
Languages : en
Pages : 492
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This 2001 book provides a thorough review of the motion of bubbles and drops in reduced gravity.
Author: Henry K. Nahra
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Category : Aeronautics
Languages : en
Pages : 676
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Author: Edward G. Keshock
Publisher:
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Category : Bubbles
Languages : en
Pages : 30
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![Bubble Behavior During Solidification in Low-Gravity. [spar 1 and Spar 3 Flights] PDF](https://books.google.com/books/content/images/frontcover/vX-TuQEACAAJ?fife=w80-h100)
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723361333
Category :
Languages : en
Pages : 26
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The trapping and behavior of gas bubbles were studied during low gravity solidification of carbon tetrabromide. The flight experiments were performed during two sounding rocket flights (SPAR 1 and SPAR 3) and involved gradient freeze solidification of gas saturated melts. Gas bubbles were evolved at the solid-liquid interfaces during the low gravity intervals. No large-scale thermal migration of bubbles, bubble pushing by the solid-liquid interface, or bubble detachment from the interface were observed during the low gravity experiments. During the SPAR 3 experiment, a unique bubble motion-fluid flow event occurred in one specimen: a large bubble moved downward and caused some circulation of the melt. The gas bubbles that were trapped by the solid in commercial purity material formed voids that had a cyclindrical shape in SPAR 3, in contrast to the spherical shape that had been observed in SPAR 1. These shapes were not influenced by the gravity level, but were dependent upon the initial temperature gradient. In higher purity material the shape of the voids changed from cylindrical in one-g to spherical in low-g. Papazian, J. M. and Wilcox, W. R. Unspecified Center NASA-CR-161159, RM-680 NAS8-31529
Author: Raj P. Chhabra
Publisher: CRC Press
ISBN: 0429522878
Category : Science
Languages : en
Pages : 733
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Book Description
Provides thorough coverage of the scientific foundations and the latest advances in particle motion in non-Newtonian media. Proveds a new detailed section on the effect of confinement on heat transfer from bluff-bodies Demonstrates how dynamic behavior of single particles can yield useful information for modeling transport processes in complex multiphase flows. Addresses heat transfer in viscoplastic fluids throughout the entire book. Highlights qualitative differences between the response of a Newtonian and non-Newtonian fluids in the complex flows encountered in processing applications
