Experimental Research of Capillary Structures Technologies for Heat Pipes

Krambeck, Larissa; Bartmeyer, Guilherme Antonio; Fusão, Davi; Santos, Paulo Henrique Dias Dos; Alves, Thiago Antonini

doi:10.26678/abcm.cobem2017.cob17-1170

Cited by 3 publications

(4 citation statements)

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“…The methodology for manufacturing, tests, and thermal analysis of the heat pipes was developed based on considerations of [7,8,13,21,22]. Three heat pipes were produced from the grooved copper tubes ASTM B-75 alloy 122 with an outer diameter of 9.45 mm, an inner diameter of 6.20 mm, and a length of 200 mm.…”

Section: The Developed Heat Pipesmentioning

confidence: 99%

“…2A, The heat pipes basically consist of a metal tube sealed with capillary structure internally, which is embedded with a working fluid. There are several kinds of capillary structures for heat pipes, as sintered, grooved, screened mesh, and composited [7]. Different from other capillary structures, in the axial microgrooves, the material is removed from the pipe's container in order to conceive the capillary structure, which contributes with the mass reduction of the passive two-phase heat transfer device [8].…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of heat pipe thermal performance with microgrooves fabricated by wire electrical discharge machining

et al. 2020

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Original scientific paper https://doi.org/10.2298/TSCI180227206BThis work presents the use of electrical discharge machining (EDM) technology for manufacturing of three different types of axial microgrooves in heat pipes. This specific process, called wire electrical discharge machining (wire-EDM), allows the fabrication of microgrooves on the inner wall of a heat pipe with accuracy. Different from other capillary structures, such as composite wick and screen mesh, the material is removed from the pipe's container in order to conceive the capillary structure, which contributes with the mass reduction of the passive two-phase heat transfer device. The heat pipes were manufactured from a straight copper pipe with the external diameter of 9.45 mm, the inner diameter of 6.20 mm, and a total length of 200 mm. Three types of axial microgrooves were manufactured for constant width (35 μm) and varying the depth (from 30-48 μm), and thickness (from 35-70 μm). The number of microgrooves was also varied from 21-32 microgrooves. Water was used as the working fluid and the loading filling ratio was 60% of the evaporator volume. The condenser was cooled by air forced convection, the adiabatic section was insulated and the evaporator was heated by an electrical resistor and it was insulated from the environment with aeronautic thermal insulation. The thermal performance of the heat pipes are analyzed based on experimental results, so the heat pipes were tested at the horizontal and different inclinations under different low heat loads (from 5-50 W or a heat flux from 0.21-2.10 W/cm 2 ). The experimental results showed that the axial microgrooves manufactured by the wire-EDM process worked satisfactorily in all analyzed cases and microgrooves of Type 1 showed a better thermal performance when compared with the others.

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Section: The Developed Heat Pipesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of heat pipe thermal performance with microgrooves fabricated by wire electrical discharge machining

et al. 2020

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“…It consists of a pouring the molten metal through a hole that is struck by a gas beam (Nitrogen, Argon, or Helium). This procedure separates the molten metal into small droplets, which solidify forming the powder particles [7]. Subsequently, the particles undergo a process of annealing in reducing atmosphere to decompose oxidized surfaces.…”

Section: IImentioning

confidence: 99%

“…The metal powder manufacturing can occur through various mechanical techniques (such as machining and grinding), electrolytic, chemical and atomization (gas, centrifugal or by liquid) [5]. The most common metal powder that is used in sintered capillary structures for application in heat pipes is copper powder, due to its high compatibility, high thermal conductivity, and ease of processing [6][7][8]. In this context, a characterization of a copper powder for heat pipe wicks was experimentally performed.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Copper Powder for Heat Pipe Wick Applications

Bartmeyer¹,

Krambeck²,

Silva³

et al. 2018

IJAERS

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In powder metallurgy, it is necessary to know the powder's nature to understand how the processing of a powder occurs. In this paper, a characterization of a copper powder for heat pipe wick applications was experimentally done. The copper powder manufacturing method was atomization. This metallic powder was characterized by Scanning Electron Microscopy (SEM), X-Ray Fluorescence Spectrometry (ED-XRF), and Laser Diffraction Granulometry. As a result, the purity and the shape are compatible with the powder manufacturing method and great for wicks. Also, the copper powder has a unimodal distribution that is excellent for capillary structures.

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Heat Pipe and Thermosyphon for Thermal Management of Thermoelectric Cooling

Alves¹,

Krambeck²,

dosSantos³

2018

Bringing Thermoelectricity Into Reality

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The heat pipe and thermosyphon are passive heat transfer devices with phase change, which can be applied for thermal management of thermoelectric cooling, such as the TEC hot side. The heat pipes basically consist of a metal tube sealed with capillary structure internally that is embedded with a working fluid. This capillary structure can be made of screen meshes, grooves, or sintered media. The thermosyphon is a heat pipe assisted by gravity, because it has no capillary structure. Then, in this chapter, manufacturing of low cost and easy-to-manufacture heat pipes and thermosyphon is described in detail, and an experimental evaluation of their thermal performance is accomplished. The considered devices were a rod, a thermosyphon, a mesh heat pipe, a grooved heat pipe, and a sintered heat pipe. According to the behavior of the global thermal resistance and the effective thermal conductivity, the passive devices operated satisfactorily with the exception of the rod and the thermosyphon in the horizontal position. The heat pipes were the best among the tested devices and the best position was vertical.

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Experimental Research of Capillary Structures Technologies for Heat Pipes

Cited by 3 publications

References 0 publications

Experimental investigation of heat pipe thermal performance with microgrooves fabricated by wire electrical discharge machining

Experimental investigation of heat pipe thermal performance with microgrooves fabricated by wire electrical discharge machining

Characterization of a Copper Powder for Heat Pipe Wick Applications

Heat Pipe and Thermosyphon for Thermal Management of Thermoelectric Cooling

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