Axially grooved heat pipes - 1976

Brennan, Patrick J.; Kroliczek, E. J.; Jen, H. F.; Mcintosh, R.

doi:10.2514/6.1977-747

Cited by 14 publications

(6 citation statements)

References 1 publication

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“…The working fluids used for the experiment were methane, ethane and ammonia. Brennan et al (1977) stated that the mathematical model agreed well with the experimental data for ideally filled and overfilled heat pipes, but some differences were noted for underfilled heat pipes.…”

mentioning

confidence: 66%

“…In addition, synopses of the two aforementioned studies on revolving HGHPs have also been provided. Brennan et al (1977) developed a mathematical model to determine the performance of an axially-grooved heat pipe which accounts for liquid recession, liquidvapor shear interaction and puddle flow in a 1-g acceleration environment. The model considered three distinct flow zones: the grooves unaffected by the puddle, the grooves that emerge from the puddle, and the grooves that are submerged by the puddle.…”

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confidence: 99%

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The Effect of Working Fluid Inventory on the Performance of Helically Grooved Heat Pipes

Thomas¹,

Castle²,

Yerkes³

1999

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Public reporting tarnten for this collection of information is estimated to average 1 hour per response, including the tm for rewewing instructions, searching existing da a souras, (gttenng and mamtarang the da a reeded^"K|2 teotactTof information. 12b. DISTRIBUTION CODE ABSTRACT (Maximum 200 words)The results of a recently completed experimental and analytical study showed that the capillary limit of a helically-grooved heat pipe (HGHP) was increased significantly when the transverse body force field was increased. This was due to the geometry of the helical groove wick structure. The objective of the present research was to experimentally determine the performance of revolving helically-grooved heat pipes when the working fluid inventory was varied. This report describes the measurement of the geometry of the heat pipe wick structure and the construction and testing of a heat pipe filling station. In addition, an extensive analysis of : the uncertainty involved in the filling procedure and working fluid inventory has been outlined. Experimental : measurements include the maximum heat transport, thermal resistance and evaporative heat transfer coefficient -* of the revolving helically-grooved heat pipe for radial accelerations of | a, | = 0.0, 2.0, 4.0, 6.0, 8.0, and 10.0-g and working fluid fills of G = 0.5, 1.0 and 1.5. An existing capillary limit model was updated and comparisons were made to the present experimental data.

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confidence: 66%

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confidence: 99%

The Effect of Working Fluid Inventory on the Performance of Helically Grooved Heat Pipes

Thomas¹,

Castle²,

Yerkes³

1999

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“…Here, T c is the condenser temperature. Thus, the characteristics of a uniform-like temperature distribution along the span of a heat pipe and a low evaporator temperature when heated are desired …”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…For portable and aerospace applications, lightweighting is one of the important design constraints. , For this purpose, simultaneously thinning the envelope wall thickness (δ 1 in Figure ) and making the wick structure highly porous (δ 2 in Figure ) are approaches that can be used. Since the heat pipe is reliant on capillarity, alternative lightweight wick structures (i) need to ensure adequate capillary pumping in the wick and (ii) provide mechanical strength and stiffness to withstand external pressure applied to the envelope.…”

Section: Introductionmentioning

confidence: 99%

An Ultralight Capillary-Driven Heat Pipe

Lee,

Wang,

Jeong

et al. 2024

Langmuir

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Capillary-driven heat pipes are an effective thermal solution for compacting electronic cooling systems. We advance such a heat pipe thermal solution with ultralightweighting for mobile applications. In our advancement, the envelope that encapsulates the phase-change process of a working fluid is fabricated via electroless plating being ∼40 μm thick. Furthermore, the wick structure that transports condensate to a heat source via capillarity is also electroless-plated onto the envelope's inner surfaces, creating a 100-μm-thick, microporous layer. This wick structure is sequentially superhydrophilized by blackening that forms a nanotexture on the microporous wick layer. An effective density of our prototype ultralight heat pipes (uHPs), as a measure of lightweighting, indicates, on average, a remarkable 73% weight reduction of commercial counterparts with sintered copper powder wick in similar exterior dimensions (e.g., ∼2.7 g, compared to ∼10.0 g) while providing equivalent heat spreading. Furthermore, the uHP operates at a 25% lower evaporator temperature, due to additional heat rejection to the surroundings through the ultrathin-walled envelope and wick.

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“…This is consistent with other test data and has been attributed to drainage effects. 30 It could also be due to the assumed character of flow with liquid overfills and an overestimate of the effects of liquid-vapor shear interaction.…”

Section: B Specifications and Test Verificationmentioning

confidence: 99%

Satellite Thermal Control for Systems Engineers

Karam¹

1998

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Axially grooved heat pipes - 1976

Cited by 14 publications

References 1 publication

The Effect of Working Fluid Inventory on the Performance of Helically Grooved Heat Pipes

The Effect of Working Fluid Inventory on the Performance of Helically Grooved Heat Pipes

An Ultralight Capillary-Driven Heat Pipe

Satellite Thermal Control for Systems Engineers

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