Abstract
The purpose of a liquid acquisition device (LAD) is to separate liquid and vapor phases inside a spacecraft propellant storage tank in the reduced gravity and microgravity conditions of space so that vapor-free liquid can be extracted to the transfer line. A popular type of LAD called a screen channel LAD or gallery arm, uses a fine porous screen and surface tension forces of the liquid to allow pure liquid to flow through the screen while blocking vapor penetration. To analyze, size, and optimize the design of LADs for future in-space propellant transfer systems, models and data are required for the four fundamental influential factors for LAD systems, including bubble point, flow-through-screen pressure drop, wicking rate, and screen compliance for a wide variety of screen meshes. While there is sporadic data available for three of these parameters, there is no published quantitative data for screen compliance. During the transient startup of propellant transfer, the liquid must be accelerated from rest to the steady flow demand velocity, which causes the screen to deform or comply, so compliance data is required for accurate transient LAD analyses; most design codes only consider steady state analysis. This paper presents screen compliance experiments on 14 different screens, examining the effects of fineness of mesh, open area, and screen metal type on compliance. A basic equation of state is also developed and validated against the data which can be easily integrated into any transient LAD flow code to model propellant transfer.
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Abbreviations
- A CH :
-
Cross sectional area of the control volume channel
- A SC :
-
Screen open area
- a SC :
-
Gravitational acceleration relative to the fluid flow
- B :
-
Screen thickness
- g :
-
Acceleration due to gravity
- h SC :
-
Height of liquid column on top of screen
- K SC :
-
Linear slope for ΔPSC/TSC curve in screen compliance
- n s :
-
Number of shute wires per inch
- n w :
-
Number of warp wires per inch
- s SC :
-
Wetted circumference of the screen\
- t :
-
Time
- T SC :
-
Effective thickness of the screen deflection
- T SCmax :
-
Maximum effective thickness of the screen deflection
- T SC0 :
-
Initial effective thickness of the screen deflection
- u :
-
Velocity of the Fluid
- V SC :
-
Volume Extracted from Liquid Reservoir under Screen
- w SC :
-
Width of the Screen
- x :
-
Dimension along the Channel
- z :
-
Height relative to the acceleration vector
- ΔP BP :
-
Bubble point pressure
- ΔP SC :
-
Screen compliance pressure difference across screen
- ν :
-
Fluid kinematic viscosity
- ρ :
-
Fluid density
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Acknowledgements
This work was funded by the Evolvable Cryogenics Project under the Space Technology Mission Directorate at the National Aeronautics and Space Administration (NASA) as well as the Florida Space Grant Consortium (FSGC) Masters Fellowship Program.
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Camarotti, C., Deng, O., Darr, S. et al. Screen Compliance Experiments for Application of Liquid Acquisition Device in Space. Microgravity Sci. Technol. 31, 109–122 (2019). https://doi.org/10.1007/s12217-018-9671-0
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DOI: https://doi.org/10.1007/s12217-018-9671-0