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  • 1
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    Benard and Marangoni convection in multiple liquid layers (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Convective fluid dynamics of immiscible double and triple liquid layers are considered. First results on multilayer convective flow, in preparation for spaceflight experiment aboard IML-2 (International Microgravity Laboratory), are discussed. Convective flow in liquid layers with one or two horizontal interfaces with heat flow applied parallel to them is one of the systems investigated. The second system comprises two horizontally layered immiscible liquids heated from below and cooled from above, that is, heat flow orthogonal to the interface. In this system convection results due to the classical Benard instability.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: ESA, Proceedings of the 8th European Symposium on Materials and Fluid Sciences in Microgravity, Volume 1; p 221-226
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Studies on copper alloys containing chromium on the copper side phase diagram (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Specimens were prepared from vacuum melted alloys of high purity vacuum melted copper and electrolytic chromium. The liquidus and eutectic point were determined by thermal analysis. The eutectic temperature is 1974.8 F and its composition is 1.28 wt% of chromium. The determination of solid solubility of chromium in copper was made by microscopic observation and electrical resistivity measurement. The solubility of chromium in solid copper is 0.6 wt% at 1050 F, 0.4 wt% at 1000 F, 0.25 wt% at 950 F, 0.17 wt% at 900 F, and 0.30 wt% at 840 F.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-77752 , NAS 1.15:77752 , REPT-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Environmental Study on the Deep-sea Mining of Manganese Nodules in the Northeastern Tropical Pacific - Modeling the sediment-laden negative buoyant flow (1999)
    ISOPE
    In:  In: Proceedings of the Third (1999) Ocean Mining Symposium Goa, India, November 8-10, 1999. ISOPE, Golden, Colo., pp. 163-168.
    Details
    Publication Date: 2016-10-28
    Description: A 3-D hydrodynamic model for sediment transport has been developed to assess the environmental impact of benthic disturbance during the deep-sea mining activity. The model was applied to the Japan Deep-Sea Impact Experiment (JET) and a series of numerical simulations were carried out in order to reproduce the observed sedimentation profile of resuspended particles. Although the general tendency was reproduced in every simulation run, the observed resedimentation maxima at the northern and the southern ends of disturber towing zone could not be accounted for after all. The' discrepancy seemed to be partly because the model did not take into account the effect of sediment-laden negative buoyant flow which must contribute to the transport of resuspended sediment. Thus the model was modified to include the density effect associated with the resuspension of sediment, and then applied again to JET site to examine how the reproducibility of the resedimentation profile was improved. From the comparison of model results, it turned out that the sediment-laden negative buoyant effect plays an important role in improving the predictive capability of the model, but does not cause the model to reproduce the double-peak phenomenon of resedimentation at the ends of towing zone. This suggests that the complete reproduction of the double-peak phenomenon requires another simulation that takes into account the sediment-laden negative buoyant effect as well as an artificial sediment source involved in recovery operations of the seabed disturber.
    Type: Book chapter , NonPeerReviewed
    Format: text
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    PAPER (OCEANREP)
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