Microgravity Performance of a Structurally Embedded Oscillating Heat Pipe

Taft, Brent S.; Laun, Fritz; Smith, Sally M.; Hengeveld, Derek W.

doi:10.2514/1.t4151

Cited by 19 publications

(8 citation statements)

References 8 publications

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“…Later on, Manzoni et al [18] proposed an advanced lumped numerical code and the predicted results showed a very good agreement with the experimental thermo-physical behavior during the gravity field transition obtained in [16]. Another test of a PHP in microgravity conditions was performed by Taft et al [19] ) are milled and the device is partially filled up with acetone. The authors observed that when the device was horizontally placed, the thermal response in microgravity was similar to that one on ground, in line with the results obtained by Mameli et al [17].…”

mentioning

confidence: 70%

Hybrid Pulsating Heat Pipe for space applications with non-uniform heating patterns: Ground and microgravity experiments

Mangini

Mameli

Fioriti

et al. 2017

Applied Thermal Engineering

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A hybrid Closed Loop Thermosyphon/Pulsating Heat Pipe with an inner diameter bigger than the capillary threshold is tested both on ground and in hyper/microgravity conditions. The device, partially filled up with FC-72, consists of an aluminum tube (inner diameter: 3 mm) bent into a planar serpentine with five curves at the evaporator. A transparent section closes the loop in the condenser zone, allowing fluid flow visualization. Five heaters are mounted alternatively on the branches, just above the turns and controlled independently, in order to investigate the effect of non-uniform heating configurations. On ground, where the device works as a thermosyphon, the non-uniform heating configurations promote the fluid net circulation in a preferential direction, increasing the thermal performance with respect to the homogeneous heating. Parabolic flights point out that during the 20 seconds of microgravity, the sudden absence of the buoyancy force activates an oscillating slug/plug flow regime, typical of the Pulsating Heat Pipes, allowing the device to work also without the assistance of gravity. Furthermore, peculiar heating configurations can shorten the stop-over periods and stabilize the pulsating two-phase flow motion.

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confidence: 70%

Hybrid Pulsating Heat Pipe for space applications with non-uniform heating patterns: Ground and microgravity experiments

Mangini

Mameli

Fioriti

et al. 2017

Applied Thermal Engineering

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“…Since OHP operation depends on the dominance of surface tension forces for ensuring capillary flow, the magnitude and direction of gravity will, in general, affect OHP thermal performance [13,17,[25][26][27][28][29][30]. For terrestrial gravity environments (i.e.…”

Section: Introductionmentioning

confidence: 99%

An investigation of a multi-layered oscillating heat pipe additively manufactured from Ti-6Al-4V powder

Ibrahim

Monroe

Thompson

et al. 2017

International Journal of Heat and Mass Transfer

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A laser powder bed fusion (L-PBF) additive manufacturing (AM) method was employed for fabricating a multi-layered, Ti-6Al-4V oscillating heat pipe (ML-OHP). The 50.8 x 38.1 x 15.75 mm 3 ML-OHP consisted of four interconnected layers of circular mini-channels, as well an integrated, hermetic-grade fill port. A series of experiments were conducted to characterize the ML-OHP thermal performance by varying power input (up to 50 W), working fluid (water, acetone, Novec TM 7200, and n-pentane), and operating orientation (vertical bottom-heating, horizontal, and vertical top-heating). The ML-OHP was found to operate effectively for all working fluids and orientations investigated, demonstrating that the OHP can function in a multilayered form, and further indicating that one can 'stack' multiple, interconnected OHPs within flat media for increased thermal management. The ML-OHP evaporator size was found to depend on the layer-wise heat penetration which subsequently depends on power input and the ML-OHP design and material selection. Using neutron radiography, electron scanning microscopy and surface metrology, the ML-OHP channel structure was characterized and found to possess partially-sintered Ti-6Al-4V powder along its periphery. The partially-sintered channel surface, although a byproduct of the L-PBF manufacturing process, was found to behave as a secondary wicking structure for enhanced capillary pumping and wall/fluid heat transfer within the OHP. With the newfound capabilities of AM, many high heat flux thermal management devices, specifically those that employ mini-or micro-channels, can be 're-invented' to possess embedded channels with atypical geometries, arrangements and surface conditions.

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“…Examples include: heat pipes/loop heat pipes 18 , annealed pyrolytic graphite panels 23 , and relatively new oscillating heat pipe technologies. 24,25 One such technology is the Thermal Control Panel (TCP) developed by Thermal Management Technologies (Figure 8). This technology provides isothermal structural panels and low thermal impedance joints for use in an isothermal S/C structure.…”

Section: B Reduced Temperature Gradientsmentioning

confidence: 99%

Enabling Future Spacecraft Missions through Isothermal Bus Thermal Management

Hengeveld

2016

46th AIAA Thermophysics Conference

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The Isothermal Bus architecture is a novel idea focused on approaching a single thermal node S/C representation. In effect, heat is shared efficiently between cold and hot components and in combination with thermal control, spatial and temporal variations in temperature are minimized. The Isothermal Bus can enable higher capability systems along with providing schedule and cost savings. A nominal case study was provided that compared a traditional TCS to the Isothermal Bus concept with a 7:1 switching ratio. While the traditional TCS could accommodate 300 W of bus power, it would require survival heaters. However, the Isothermal Bus concept would enable a 167% increase in bus power while almost eliminating the need for survival heat. I. Nomenclature AI&T= Assembly, Integration, and Test ATT = Active Thermal Tile HTC = High Thermal Conductance ITEMS = Integrated Thermal Energy Management System LEO = Low Earth Orbit MLI = Multilayer Insulation PnP = Plug-and-play OLR = Outgoing Longwave Radiation S/C = Spacecraft SMARTS = Satellite Modular and Reconfigurable Thermal System TCP = Thermal Control Panel TCS = Thermal Control Subsystem VHT = Variable Heat Transfer II. Introduction PACE exploitation provides tremendous opportunities. Since 1957, spacecraft (S/C) have been developed to take advantage of this new high ground by providing communication, scientific observation, weather monitoring, navigation, remote sensing, surveillance, and data-relay services. 1 However, space presents extraordinary challenges. Consequently, S/C have become exceedingly complex and costly. Current S/C can take 1 Senior Engineer, AIAA Senior Member. 2 Senior Mechanical Engineer, Space Vehicles Directorate, AIAA Senior Member. 3 Mechanical Engineer, Space Vehicles Directorate, AIAA Member. S Downloaded by PURDUE UNIVERSITY on June 24, 2016 | http://arc.aiaa.org |

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Microgravity Performance of a Structurally Embedded Oscillating Heat Pipe

Cited by 19 publications

References 8 publications

Hybrid Pulsating Heat Pipe for space applications with non-uniform heating patterns: Ground and microgravity experiments

Hybrid Pulsating Heat Pipe for space applications with non-uniform heating patterns: Ground and microgravity experiments

An investigation of a multi-layered oscillating heat pipe additively manufactured from Ti-6Al-4V powder

Enabling Future Spacecraft Missions through Isothermal Bus Thermal Management

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