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  • 1
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    A new hydrodynamic prediction of the peak heat flux from horizontal cylinders in low speed upflow (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Flow-boiling data have been obtained for horizontal cylinders in saturated acetone, isopropanol, and water, yielding heat flux vs. wall superheat boiling curves for the organic liquids. A region of low speed upflow is identified in which long cylindrical bubbles break off from the wake with regular frequency. The Strouhal number of bubble breakoff is a function only of the Froude number in any liquid, and the effective wake thickness in all liquids is a function of the density ratio and the Froude number. A low speed flow boiling burnout prediction procedure is presented which yields accurate results in widely dissimilar liquids.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: ASME 1988 National Heat Transfer Conference; Jul 24, 1988 - Jul 27, 1988; Houston, TX; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Acceleration induced depriming and capillary rewetting of external artery heat pipes - Comparison with SHARE-II flight experiment (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A combined analytical and numerical model for the analysis of the deprime and reprime/rewetting characteristics of two high-capacity external artery heat pipe designs undergoing externally induced accelerations was developed using several previously derived analytical expressions. Three distinct phases of the deprime and reprime/rewetting process were analyzed: (1) the effect of longitudinal accelerations on the depriming, (2) the time required for repriming of the liquid artery once the longitudinal acceleration has been terminated, and (3) the rewetting characteristics of the circumferential wall grooves. Combining the three processes, a technique was developed allowing the prediction of the effect of external acceleration on the characteristics of the external artery heat pipes. The predictions made with this technique agreed well with the microgravity flight results.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 93-0282 , ; 11 p.|AIAA, Aerospace Sciences Meeting and Exhibit; Jan 11, 1993 - Jan 14, 1993; Reno, NV; United States
    Format: text
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    NASA TECHNICAL REPORTS
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