A thermally activated paraffin-based actuator for gas-flow control in a satellite electrical propulsion system

Klintberg, Lena; Karlsson, Mikael; Stenmark, Lars; Thornell, Greger

doi:10.1016/s0924-4247(03)00203-6

Cited by 21 publications

(14 citation statements)

References 6 publications

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“…It should be mentioned that the selection of materials, and the experimental conditions, were to some extent governed by the use of paraffin actuators in space applications [2,3]. The small dimensions of the samples primarily serve the purpose of getting as many samples as possible out of a silicon wafer.…”

Section: Discussionmentioning

confidence: 99%

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A solder sealing method for paraffin-filled microcavities

Nguyen¹,

Bejhed²,

Köhler³

et al. 2006

J. Micromech. Microeng.

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Abstract.Demonstrated and investigated here is a method to seal microfluidic systems by soldering. As a particularly difficult case of growing importance, the sealing of openings contaminated with paraffin wax was studied. Solder paste, screen printed on a metallized silicon, substrate was melted locally through application of 6.5 to 10 V to a 5 Ω copper film resistor for a few seconds and found able to drive an intermediate layer of paraffin away and seal a 0.2 mm diameter circular via by wetting to a surrounding copper pad. Although verified to be robust, the process did result in failing seals on excessive heating because of consumption of the pads. Correctly performed, the technique provided a seal at least withstanding a pressure of 8 bar for 8 h at 85ºC.

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Section: Discussionmentioning

confidence: 99%

“…The above mentioned bulk micromachined actuators [1][2][3][4] contain a paraffin reservoir accessed via a channel ending with an opening at the device surface. The design of the samples for experiments in this work mimics the inlets of these devices.…”

Section: Device Designmentioning

confidence: 99%

A solder sealing method for paraffin-filled microcavities

Nguyen¹,

Bejhed²,

Köhler³

et al. 2006

J. Micromech. Microeng.

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“…At The Ångström Space Technology Centre (ÅSTC), Uppsala University, microfluidic systems have been demonstrated for cold gas propulsion and satellite attitude control [12][13][14] , being commercialized by NanoSpace AB. An interesting concept for safe gas storage with a vision for hydrogen fuel storage has been suggested; using a silicon based passive valve system in Ping Pong ball sized pressure vessels 15 .…”

Section: Gas Driven Vehiclesmentioning

confidence: 99%

High-pressure microfluidics

Hjort

2015

SPIE Proceedings

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When using appropriate materials and microfabrication techniques, with the small dimensions the mechanical stability of microstructured devices allows for processes at high pressures without loss in safety. The largest area of applications has been demonstrated in green chemistry and bioprocesses, where extraction, synthesis and analyses often excel at high densities and high temperatures, which are accessible through high pressures. Capillary chemistry has been used since long but, just like in low-pressure applications, there are several potential advantages in using microfluidic platforms, e.g., planar isothermal set-ups, large local variations in geometries, dense form factors, small dead volumes and precisely positioned microstructures for control of reactions, catalysis, mixing and separation. Other potential applications are in, e.g., microhydraulics, exploration, gas driven vehicles, and high-pressure science. From a short review of the state-of-art and frontiers of high pressure microfluidics, the focus will be on our different solutions demonstrated for microfluidic handling at high pressures and challenges that remain.

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“…SATV is a self-driven adaptive thermostatic valve which can realize the automatic proportional control of flow and temperature by applying the linear expansion or contraction characteristic of sensitive wax.. As an appealing choice for spacecraft thermal control system, SATV has been studied by many researchers [8][9][10][11][12]. In addition to analyze the dynamic behavior of applications such as cooling system of automotive engine and air-conditioning system with SATV by establishing the mathematical models and numerical simulation [8][9], the characteristic of sensitive wax which impact the thermal control effect of SATV are also studied [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Transient performance investigation of a self-driven adaptive thermostatic valve for single-phase space thermal control Loop

Wang

2013

2013 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

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A novel thermal control system which adopt a self-driven adaptive thermostatic valve for single-phase space thermal control Loop (SSTCL-SATV) has been proposed to improve the thermal control adaptability and energy-saving requirement of spacecraft. This self-driven adaptive thermostatic valve can realize the automatic proportional control of flow and temperature by applying the linear expansion or contraction characteristic of sensitive wax. The mathematic model of SSTCL-SATV such as SATV, radiator, and heat source are established for predicting temperature dynamic performance of the thermal control system by lumped parameter method. The transient response of temperature under different sensitive wax parameters such as layout, phase-change range, time constant and temperature delay are presented by numerical simulation to analyze the control effect of SATV by comparing the control overshoot, settling time and finial offset values. These results will supply a design reference of SSTCL-SATV to adapt the complicated space environment.

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A thermally activated paraffin-based actuator for gas-flow control in a satellite electrical propulsion system

Cited by 21 publications

References 6 publications

A solder sealing method for paraffin-filled microcavities

A solder sealing method for paraffin-filled microcavities

High-pressure microfluidics

Transient performance investigation of a self-driven adaptive thermostatic valve for single-phase space thermal control Loop

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