Flowmeter measures low gas-flow rates
Positive-displacement flowmeter measures low gas-flow rates by gaging the time required for a slug of mercury to pass between two reference levels in a tube of known volume.
Wells, F. E.↗
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Results for “flow rate”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Effect of flow rate on the dynamic contact angle for wetting liquids
Flow rate effect on dynamic contact angle for wetting liquids in weightless environment
Coney, T. A.↗
Gas low pressure low flow rate metering system Patent
Flowmeters for sensing low fluid flow rate and pressure for application to respiration rate studies
Fagot, R. J.↗
PERFORMANCE OF A SIMPLIFIED LOW-FLOW RATE COLD-WATER DEAERATOR
Performance of a simplified low flow rate cold- water deaerator
WATER↗
Wide-range instrument monitors flow rates of chemically active fluids
In-like transducers system measures flow rate of chemically active propellant fluids. The system uses one low-flow transducer and one high-flow transducer. Each consists of separate heater and temperature-sensing elements.
Source record↗
Mass-flow rates and total-pressure recoveries for a semicircular open-nose inlet at Mach 6
Mass flow rates and total-pressure recoveries for air breathing engine inlet - Fortran computer program
PRESSURE RECOVERY↗
Economic method for measuring ultra-low flow rates of fluids
Capillary tube flowmeter measures ultra-low flows of very corrosive fluids /such as chlorine trifluoride and liquid fluorine/ and other liquids with reasonable accuracy. Flowmeter utilizes differential pressure transducer and operates on the principle that for laminar flow in the tube, pressure drop is proportional to flow rate.
Bogdanovic, J. A.↗
Solid Hydrogen Particles and Flow Rates Analyzed for Atomic Fuels
The experiments were conducted at Glenn's Small Multipurpose Research Facility (SMIRF, ref. 5). The experimental setup was placed in the facility's vacuum tank to prevent heat leaks and subsequent boiloff of the liquid helium. Supporting systems maintained the temperature and pressure of the liquid helium bath where the solid particles were created. Solid hydrogen particle formation was tested from February 23 to April 2, 2001. Millimeter-sized solid-hydrogen particles were formed in a Dewar of liquid helium as a prelude to creating atomic fuels and propellants for aerospace vehicles. Atomic fuels or propellants are created when atomic boron, carbon, or hydrogen is stored in solid hydrogen particles. The current testing characterized the solid hydrogen particles without the atomic species, as a first step to creating a feed system for the atomic fuels and propellants. This testing did not create atomic species, but only sought to understand the solid hydrogen particle formation and behavior in the liquid helium. In these tests, video images of the solid particle formation were recorded, and the total mass flow rate of the hydrogen was measured. The mass of hydrogen that went into the gaseous phase was also recorded using a commercially available residual gas analyzer. The temperatures, pressures, and flow rates of the liquids and gases in the test apparatus were recorded as well. Testing conducted in 1999 recorded particles as small as 2 to 5 mm in diameter. The current testing extended the testing conditions to a very cold Dewar ullage gas of about 20 to 90 K above the 4 K liquid helium. With the very cold Dewar gas, the hydrogen freezing process took on new dimensions, in some cases creating particles so small that they seemed to be microscopic, appearing as infinitesimally small scintillations on the videotaped images.
Palaszewski, Bryan A.↗
Analysis of Oxygen Liquefaction with Transient Flow Rates for ISRU Systems
Human occupation of lunar and Martian surfaces requires in-situ resource utilization (ISRU) to create a sustainable environment with the limited resources available in space. Fuel and oxidizer generation is essential for developing a refueling capability for spacecraft, significantly reducing the propellant mass required for landing. Liquefaction systems are a key step in producing and storing cryogenic liquids such as oxygen, hydrogen, and methane. All those fluids are critical to propulsion, life support, and other spacecraft systems. NASA has previously confirmed the presence of water on the Moon and an electrolysis process can be used to separate the oxygen from the hydrogen molecules. Oxygen has also been found within lunar regolith and can be separated through ISRU processes. The extracted oxygen gas can then be liquefied inside a storage tank with tube-on-tank heat exchangers for future use as an oxidizer for propellants. While steady state liquefaction performance is easy to model, power limitations and cyclical environments caused by the change in Sun exposure between day and night periods potentially call for transient operations. The following analysis was performed using the Thermal Desktop software to investigate how various transient gaseous oxygen (GOX) flow rates impact the production and storage of liquid oxygen (LOX) in a 1-g liquefaction system. Variations of sinusoidal and exponential step functions were selected to model potential GOX flow rates that could be experienced by ISRU systems on lunar or Martian surfaces. This early computational analysis provides some insight on how transient operations impact oxygen liquefaction systems and helps illustrate operational questions to explore experimentally throughout the design process.
Cryogenic Fluid Management↗
Enthalpy calculated from pressure and flow- rate measurements in high-temperature subsonic streams
Enthalpy calculation from pressure and flow rate measurements in high temperature subsonic streams
ENTHALPY↗
Sensitivity to edge and flow rate in the control of speed and altitude
A number of studies have examined the potential efficacy of global flow rate and edge rate for specifying changes in self-motion. These have ranged from passive judgements of simulated accelerating self-motion to the active control of altitude in the presence of changes in flow and edge rates. A number of these studies are summarized and an attempt is made to reconcile their respective findings.
Wolpert, Lawrence↗
Flow rate logging seepage meter
An apparatus for remotely measuring and logging the flow rate of groundwater seepage into surface water bodies. As groundwater seeps into a cavity created by a bottomless housing, it displaces water through an inlet and into a waterproof sealed upper compartment, at which point, the water is collected by a collection bag, which is contained in a bag chamber. A magnet on the collection bag approaches a proximity switch as the collection bag fills, and eventually enables the proximity switch to activate a control circuit. The control circuit then rotates a three-way valve from the collection path to a discharge path, enables a data logger to record the time, and enables a pump, which discharges the water from the collection bag, through the three-way valve and pump, and into the sea. As the collection bag empties, the magnet leaves the proximity of the proximity switch, and the control circuit turns off the pump, resets the valve to provide a collection path, and restarts the collection cycle.
Reay, William G.↗
Flow rates for sharp-edged orifices
Two charts are proposed for calculating the flow coefficient and the area correction factor used in the equation for the flow rate through a sharp-edged orifice. The proposed charts account for variations in the discharge coefficient of sharp-edged orifices and can be used with any pressure ratio for both subcritical and supercritical flow conditions. They can also be used for any gas by using the appropriate gas constant and ratio of specific heats. The application of the charts is illustrated by examples.
Groesbeck, W. A.↗
Design and development of a test facility for the disposal of hydrogen at high flow rates.
Burn-pond concept of test facility for disposing of hydrogen at high flow rates
TEMPERATURE FIELD↗
A set of FORTRAN 4 routines used to calculate the mass flow rate of natural gas through nozzles
Set of FORTRAN 4 subroutines to calculate mass flow rate of natural gas through nozzles, also thermodynamic functions such as compressibility factor, entropy, enthalpy, and specific heat
Johnson, R. C.↗
Development and verification of methods for predicting flow rates through leaks in valves and couplings
A survey of techniques for predicting the mass flow rate of fluid through a slender passage that might represent a scratch in a seal in a valve or coupling is presented. A typical seal in such an installation consists of a plastic gasket clamped between polished metal surfaces. The cross sectional shape of such a leak passage may vary slowly along the passage and one is led to examine the model of fully developed laminar flow through a pipe of noncircular cross section.
Russell, John M.↗
Propellant flow rate through simulated liquid-core nuclear rocket fuel bed.
Experimental investigation of the validity of Zuber and Finlay's (1965) gas flow-rate formula for a two-phase flow in a rotating cylinder under high centrifugal acceleration. This formula was originally derived from tests in a 1-g environment in pipes. In the light of the investigation results obtained, the formula is valid also for a high-g environment in the rotating chamber tested.
Mcguirk, J. P.↗
Controlling a wide range of flow rates
Servo-operated valve and two flowmeters allow accurate control over 1,900:1 flow-rate range. It was developed as part of laboratory instrument for measuring properties of confined fluids under conditions analogous to those encountered in deep drilling operations.
Perkins, G. S.↗