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Wednesday, August 5, 2020 | History

4 edition of Influence of two-phase thermocapillary flow on cryogenic liquid retention in microscopic pores found in the catalog.

Influence of two-phase thermocapillary flow on cryogenic liquid retention in microscopic pores

Influence of two-phase thermocapillary flow on cryogenic liquid retention in microscopic pores

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Published by American Institute of Aeronautics and Astronautics, [National Aeronautics and Space Administration, National Technical Information Service, distributor in Washington, D.C, Springfield, Va .
Written in English

    Subjects:
  • Capillary flow,
  • Two phase flow,
  • Microgravity,
  • Liquid surfaces,
  • Liquid hydrogen,
  • Convection,
  • Flow distribution,
  • Mathematical models,
  • Helium

  • Edition Notes

    Other titlesInfluence of two phase thermocapillary flow on cryogenic liquid retention in microscopic pores.
    StatementG.R. Schmidt ... [et al.].
    Series[NASA contractor report] -- NASA-CR-202588., NASA contractor report -- NASA CR-202588.
    ContributionsSchmidt, G. R., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17540819M
    OCLC/WorldCa38922007

    The purpose of this book is to describe characteristic features of cryogenic systems involving two-phase flow, create mathematical models of these systems, and then show how the models may be used to develop optimal designs for practical cryogenic systems. cryogenic boiling and two-phase chilldown process under terrestrial and microgravity conditions by kun yuan a dissertation presented to the graduate school of the university of florida in partial fulfillment of the requirements for the degree of doctor of philosophy university of florida

    Thompson, , Niihle et al., ). The investigations of the thermocapillary migration of droplets in iiq-uid are more recent and less have been performed. Chifu et al. () observed the flow on the surface of a droplet (freely suspended in a liquid) by injecting a small amount of a dyed surfactant into the interface. TheFile Size: KB. The new enthalpy for two-phase flow depends on x, and the new density is defined by the void fraction α in Eq. (4), while the relation between x and α is defined by Eq. (6). The model was applied to consider two-phase flow of liquid nitrogen in the KSC experimental cryogenic transfer : Ekaterina Ponizovskaya-Devine, Dmitry Luchinsky, Michael Foygel, Vasil Hafiychuk, Michae Khasin, Jar.

    –Control of liquid levels, long time constants, inventory management –Forced convection for warm-up and cool-down • Two-phase flow –Liquid and vapor phases separate with any acceptably low pressure drop –Baker Plot does not apply! January, USPAS Cryogenic Fluids Tom Peterson 22File Size: 1MB. cryogenic two-phase flow and phase-change heat transfer in microgravity by cheng-feng tai a dissertation presented to the graduate school of the university of florida in partial fulfillment of the requirements for the degree of doctor of philosophy university of florida


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Influence of two-phase thermocapillary flow on cryogenic liquid retention in microscopic pores Download PDF EPUB FB2

Get this from a library. Influence of two-phase thermocapillary flow on cryogenic liquid retention in microscopic pores. [G R Schmidt; United States. National Aeronautics and Space Administration.;].

With superheating, the two terms exert the same influence on curvature and promote mechanical equilibrium, but with subcooling, the pressure distribution produces a suction about the pore center-line that degrades retention.

This result points to thermocapillary-induced deformation arising from condensation as the cause for retention loss. The objective is to determine whether the two-phase thermocapillary convection arising from thermodynamic non-equilibrium along the porous surfaces of such devices could lead to this observed degradation in retention performance.

Pressurant effects on cryogenic liquid acquisition devices. Influence of two-phase thermocapillary flow on liquid retention in microscopic pores. George R. Schmidt, Influence of two-phase thermocapillary flow on cryogenic liquid retention in microscopic by: The conclusion of the present paper shows that, the influence of thermocapillary flow of a Newtonian fluid has contribution to the enlargement of the cross-section.

The both the effect of rheology property of a non-Newtonian fluid and the effect of the thermocapillary flow was discussed elsewhere [12], and either effect has contribution to the enlargement of the cross-section in the polymer by: 3.

Newton's method for solving heat transfer, fluid flow and interface shapes in a floating molten zone International Journal for Numerical Methods in Fluids, Vol. 19, No. 1 Influence of two-phase thermocapillary flow on cryogenic liquid retention in microscopic poresCited by: Two-phase flows are those flows in which there is a mixture of two physical states (solid, liquid or vapor).

In cryogenic applications, such flows are almost always a mixture of a cryogenic liquid along with its corresponding vapor. Introduction. Cryogenic fluids, such as liquid hydrogen (LH 2), liquid oxygen (LOX), and liquid methane (CH 4), have been regarded as the preferred propellants for space launch vehicles around the world because of their advantages of high specific impulse, large thrust and environmentally friendly r, due to the low boiling point characteristics of cryogenic fluids, two Cited by: 4.

The aim of this paper is to examine the results of a flow visualization study on two-phase cryogenic flow passing through a internal nozzle.

The transient growth process of the cloud cavitation induced by flow through the throat is observed using high-speed video images and analyzed by pressure and accelerometer signal.

Paper ID ILASS 1. Advantages of Cryogenic Condensation When evaluating cryogenic condensation systems for emission control of regulated solvent vapors (VOCs or HAPs), decision makers should consider the following. Flexibility. Emission concentration of solvent vapors can be readily maintained and controlled by adjusting the flow rate of liquid nitrogen into the File Size: 1MB.

uniform RMF. Yao [18] investigated the influence of a uniform RMF on the thermocapillary flow in a liquid bridge and reported that the double instabilities, which occur with increasing Ma without RMF, were controlled effectively under the external uniform RMF, and the flow became steady and approximately axisymmetric.

Thermocapillary flow within large sized drops of diameters up to 15 mm was studied experimentally during KC parabolic flights. For the simultaneous observation of the flow and the temperature fields inside the drops, visualisation by means of liquid crystal tracers was applied.

Due to the curved surfaces of the drops, a special evaluation method has to be taken into by: 4. Cryogenic Fluid Mechanics Fluid flow commonly occurs in most cryogenic systems is the ratio of the pressure drop for the pure liquid/vapor phases.

The two phase flow friction multiplier is then given as a correlation in terms of the factor. 2)) 2 2 2 2. X Natural circulation loops are very useful in many cryogenic. We have investigated the thermocapillary flow of a Newtonian liquid on hydrophilic microstripes which are lithographically defined on a hydrophobic surface.

The speed of the microstreams is studied as a function of the stripe width w, the applied thermal gradient |dT/dx| and the liquid volume V deposited on a connecting reservoir pad.

Numerical solutions of the flow speed as a function of Cited by: The fluid was heated either by a cylinderical heater ( cm diameter) located along the container centerline or by a CO 2 laser beam to induce thermocapillary flow.

Several thermistor probes were placed in the fluid to measure the temperature distribution. The temperature distribution along the liquid-free surface was measured by an infrared Cited by: This paper presents thermal analysis of a × mesh LAD sample that was tested over a wide range of liquid methane temperatures (– K) and pressures (– MPa) for a LAD.

For many industrial, medical and space technologies, cryogenic fluids play indispensable roles. An integral part of the cryogenic transport processes is the chilldown of the system components during initial applications. In this paper, we report experimental results for a chilldown process that is involved with the unsteady two-phase vapor-liquid flow and boiling heat transfer of the cryogen Cited by: Cryogenic systems that involve two-phase (vapor-liquid) flows are widely used in aerospace, metallurgy, power engineering, and high energy physics research.

This book describes characteristic features of cryogenic systems involving two-phase flow, creates mathematical models of these systems, and shows how the models may be used to develop optimal designs for practical cryogenic by:   Cryogenic Two-Phase Flow by N.

Filina,available at Book Depository with free delivery worldwide. This thesis represents the first systematic description of the two-phase flow problem. Two-phase flows of volatile fluids in confined geometries driven by an applied temperature gradient play an important role in a range of applications, including thermal management, such as heat pipes, thermosyphons, capillary pumped loops and other evaporative cooling : Springer International Publishing.

liquid front can be below the liquid vapor pressure, resulting in a cavitation regime where the liquid flow is transformed into two-phase flow, together with the absorption and desorption into the liquid propellant of NCG if initially present in the line.

On top of that, the propellant is pressurized in the tanks. In order to understand the fundamental characteristics of thermocapillary convection in an encapsulated liquid bridge, we conducted a series of unsteady three-dimensional numerical simulations of thermocapillary convection in an encapsulated liquid bridge with either 2 or 3 mm inner diameter and 4 – 7 mm outer diameter as well as variable height 1–3 mm heated from the top wall and cooled Cited by: 7.Investigation of thermocapillary convection in a three-liquid-layer system - Volume - Ph.

Alvarez, Nicolas J. and Uguz, A. Kerem The impact of deformable interfaces and Poiseuille flow on the thermocapillary instability of three immiscible phases confined in a channel. If this is the first time you use this feature, you will Cited by: