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  • 1
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    Fluid bubble eliminator (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: A gas-liquid separator uses a helical passageway to impart a spiral motion to a fluid passing therethrough. The centrifugal fore generated by the spiraling motion urges the liquid component of the fluid radially outward which forces the gas component radially inward. The gas component is then filtered through a gas-permeable, liquid-impervious membrane and discharged through a central passageway.
    Keywords: Fluid Mechanics and Thermodynamics
    Format: application/pdf
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  • 2
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    ISS Internal Active Thermal Control System (IATCS) Coolant Remediation Project (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: The IATCS coolant has experienced a number of anomalies in the time since the US Lab was first activated on Flight 5A in February 2001. These have included: 1) a decrease in coolant pH, 2) increases in inorganic carbon, 3) a reduction in phosphate buffer concentration, 4) an increase in dissolved nickel and precipitation of nickel salts, and 5) increases in microbial concentration. These anomalies represent some risk to the system, have been implicated in some hardware failures and are suspect in others. The ISS program has conducted extensive investigations of the causes and effects of these anomalies and has developed a comprehensive program to remediate the coolant chemistry of the on-orbit system as well as provide a robust and compatible coolant solution for the hardware yet to be delivered. The remediation steps include changes in the coolant chemistry specification, development of a suite of new antimicrobial additives, and development of devices for the removal of nickel and phosphate ions from the coolant. This paper presents an overview of the anomalies, their known and suspected system effects, their causes, and the actions being taken to remediate the coolant.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: SAE-051CES-279 , 2005 International Conference on Environmental Systems (ICES) 35th Annual Meeting; Jul 11, 2005 - Jul 14, 2005; Rome; Italy
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  • 3
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    Source Listings for Computer Code SPIRALI Incompressible, Turbulent Spiral Grooved Cylindrical and Face Seals (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: This is the source listing of the computer code SPIRALI which predicts the performance characteristics of incompressible cylindrical and face seals with or without the inclusion of spiral grooves. Performance characteristics include load capacity (for face seals), leakage flow, power requirements and dynamic characteristics in the form of stiffness, damping and apparent mass coefficients in 4 degrees of freedom for cylindrical seals and 3 degrees of freedom for face seals. These performance characteristics are computed as functions of seal and groove geometry, load or film thickness, running and disturbance speeds, fluid viscosity, and boundary pressures.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA/CR-2003-212360 , MTI 95TM6 , E-13616
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  • 4
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    Fluid Bubble Eliminator (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: A gas-liquid separator uses a helical passageway to impart a spiral motion to a fluid passing therethrough. The centrifugal fore generated by the spiraling motion urges the liquid component of the fluid radially outward which forces the gas component radially inward. The gas component is then filtered through a gas-permeable, liquid-impervious membrane and discharged through a central passageway.
    Keywords: Fluid Mechanics and Thermodynamics
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  • 5
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    CFD Modeling Needs and What Makes a Good Supersonic Combustion Validation Experiment (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: If a CFD code/model developer is asked what experimental data he wants to validate his code or numerical model, his answer will be: "Everything, everywhere, at all times." Since this is not possible, practical, or even reasonable, the developer must understand what can be measured within the limits imposed by the test article, the test location, the test environment and the available diagnostic equipment. At the same time, it is important for the expermentalist/diagnostician to understand what the CFD developer needs (as opposed to wants) in order to conduct a useful CFD validation experiment. If these needs are not known, it is possible to neglect easily measured quantities at locations needed by the developer, rendering the data set useless for validation purposes. It is also important for the experimentalist/diagnostician to understand what the developer is trying to validate so that the experiment can be designed to isolate (as much as possible) the effects of a particular physical phenomena that is associated with the model to be validated. The probability of a successful validation experiment can be greatly increased if the two groups work together, each understanding the needs and limitations of the other.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: JANNAF 40th Combustion/28th Airbreathing Propulsion/22nd Propulsion Systems Hazards/4th Modeling and Simulation Joint Subcommittee Meeting; Jun 13, 2005 - Jun 17, 2005; Charleston, SC; United States
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  • 6
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    Electro-Active Device Using Radial Electric Field Piezo-Diaphragm for Control of Fluid Movement (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: A fluid-control electro-active device includes a piezo-diaphragm made from a ferroelectric material sandwiched by first and second electrode patterns configured to introduce an electric field into the ferroelectric material when voltage is applied thereto. The electric field originates at a region of the ferroelectric material between the first and second electrode patterns, and extends radially outward from this region of the ferroelectric material and substantially parallel to the plane of the ferroelectric material. The piezo-diaphragm deflects symmetrically about this region in a direction substantially perpendicular to the electric field. An annular region coupled to and extending radially outward from the piezo-diaphragm perimetrically borders the piezo-diaphragm, A housing is connected to the region and at least one fluid flow path with piezo-diaphragm disposed therein.
    Keywords: Fluid Mechanics and Thermodynamics
    Format: text
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  • 7
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    Wind-US Unstructured Flow Solutions for a Transonic Diffuser (2005)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The Wind-US Computational Fluid Dynamics flow solver computed flow solutions for a transonic diffusing duct. The calculations used an unstructured (hexahedral) grid. The Spalart-Allmaras turbulence model was used. Static pressures along the upper and lower wall agreed well with experiment, as did velocity profiles. The effect of the smoothing input parameters on convergence and solution accuracy was investigated. The meaning and proper use of these parameters are discussed for the benefit of Wind-US users. Finally, the unstructured solver is compared to the structured solver in terms of run times and solution accuracy.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA/CR-2005-213417 , AIAA Paper 2005-1004 , E-14939 , AIAA 43rd Aerospace Sciences Meeting and Exhibit; Jan 10, 2005 - Jan 13, 2005; Reno, NV; United States
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  • 8
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    Modeling of Turbulence Effects on Liquid Jet Atomization and Breakup (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-27
    Description: Recent experimental investigations and physical modeling studies have indicated that turbulence behaviors within a liquid jet have considerable effects on the atomization process. This study aims to model the turbulence effect in the atomization process of a cylindrical liquid jet. Two widely used models, the Kelvin-Helmholtz (KH) instability of Reitz (blob model) and the Taylor-Analogy-Breakup (TAB) secondary droplet breakup by O Rourke et al, are further extended to include turbulence effects. In the primary breakup model, the level of the turbulence effect on the liquid breakup depends on the characteristic scales and the initial flow conditions. For the secondary breakup, an additional turbulence force acted on parent drops is modeled and integrated into the TAB governing equation. The drop size formed from this breakup regime is estimated based on the energy balance before and after the breakup occurrence. This paper describes theoretical development of the current models, called "T-blob" and "T-TAB", for primary and secondary breakup respectivety. Several assessment studies are also presented in this paper.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: 43rd AIAA Aerospace Sciences Meeting and Exhibit; 10-13 Ja. 2005; Reno, NV; United States
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  • 9
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    Thermal Conductivity and Specific Heat Measurements of Candidate Structural Materials for the JWST Optical Bench (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: The James Webb Space Telescope will include an optical bench known as the integrated science instrument module (ISIM). Candidate structural materials for the ISIM must have low density, high stiffness, high thermal conductivity, and low thermal expansion coefficient at the operating temperature of 30 Kelvin. The specific heat is also important in modeling the on-orbit cooldown. We built two different systems for measuring the thermal conductivity and specific heat of samples between 4 Kelvin and 290 Kelvin. Both experiments were carefully designed to minimize potential errors due to radiative heat transfer. We chose the cooling system and instrumentation to allow long-term unattended operation. Software was developed to automate each experiment. It used an algorithm designed to ensure that each system was in thermal equilibrium before a measurement was taken. We describe the two experiments and present the data.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: 2005 Cryogenic Engineering Conference and International Cryogenic Materials Conference; Aug 29, 2005 - Sep 02, 2005; Keystone, CO; United States
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  • 10
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    A PdMn Based High Resolution Thermometer for the Temperature Range of 0.7-1 K (2005)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Experiments Along the Coexistence near Tricriticality (EXACT) will test exact predictions made by Renormalization Group theory by mapping the phase diagram of liquid He-3 and He-4 mixtures at the tricritical point, Tcp=0.867 K. A PdMn based High Resolution Thermometer (HRT) will be utilized by EXACT to make accurate measurements with a resolution that has never been attained for the temperature range 0.7-1 K. The basic design of this mini high resolution thermometer comprises a sensing element whose magnetic susceptibility changes with temperature, a thermal connector, magnetic shielding, and some permanent magnets to apply a constant magnetic field. In this study, we will quantitatively determine the resolution of possible sensing element candidates of 0.15%, 0.20%, and 0.25% ppm Mn and compare them with an annealed group of PdMn with the corresponding concentrations to see how this processing technique affects sensitivity.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: Summer Student Research Presentations; 37-38; JPL-Publ-05-07
    Format: text
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