Bendable Heat Pipes Using Sintered Metal Felt Wicks

Harris, Daniel K.; Odhekar, Dhananjay

doi:10.5098/fhp.v2.2.3002

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…10. Influence of bending on the trend of maximum capillary limit: case (A) [9], case (B) [16], case (C) [7], case (D) [17] and case (E) [18].…”

Section: Effect Of Inclination Angle On the Capillary Limit Of Bent H...mentioning

confidence: 99%

To bend or not to bend: Impact on heat pipe performance

Wits,

Groot,

Jafari

2023

2023 29th International Workshop on Thermal Investigations of ICs and Systems (THERMINIC)

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Thermal management of electronics continues to be a dominant factor that needs attention already early in the design phase. Within complex systems, typically a battle for space is imminent due to the multidisciplinary nature. In this respect, the use of low-form-factor phase-transitional devices is standard industry practice nowadays. In particular, heat pipes have demonstrated high heat transfer rates, due to the utilization of a working fluid's latent heat in combination with reliable, small and lightweight designs. Heat pipes are employed in electronics cooling in which they are often bent and operated under different operating conditions. This study aims to investigate how heat pipes function when bent at various angles and inclinations. The impact of various bending angles (no bend, 30° bend, 2 30° bend, 45° bend, 2 45° bend and 90° bend) and x x inclination angles (horizontal, ±45° and ±90°) is examined. Bending losses and an associated theoretical model are validated for sintered-wick heat pipes. Heat pipe bending has minimal effect on the thermal performance as long as the bending angle does not exceed 45°. It is however important to consider gravity when operating bent heat pipes outside the horizontal plane.

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“…10. Influence of bending on the trend of maximum capillary limit: case (A) [9], case (B) [16], case (C) [7], case (D) [17] and case (E) [18].…”

Section: Effect Of Inclination Angle On the Capillary Limit Of Bent H...mentioning

confidence: 99%

To bend or not to bend: Impact on heat pipe performance

Wits,

Groot,

Jafari

2023

2023 29th International Workshop on Thermal Investigations of ICs and Systems (THERMINIC)

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“…The device transferred up to 12 W of power with an effective thermal conductivity of up to 830 W(m K) −1 . Odhekar et al [21] presented the results of testing a copper/water heat pipe with sintered copper fiber wicking from 0 • to 90 • flex. They found that the flex angle had little effect on the temperature distribution and resulting copper equivalence due to the deformability of the wick structure.…”

Section: Introductionmentioning

confidence: 99%

Flat flexible polymer heat pipes

Oshman¹,

Li²,

Liew³

et al. 2012

J. Micromech. Microeng.

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Flat, flexible, lightweight, polymer heat pipes (FPHP) were fabricated. The overall geometry of the heat pipe was 130 mm × 70 mm × 1.31 mm. A commercially available low-cost film composed of laminated sheets of low-density polyethylene terephthalate, aluminum and polyethylene layers was used as the casing. A triple-layer sintered copper woven mesh served as a liquid wicking structure, and water was the working fluid. A coarse nylon woven mesh provided space for vapor transport and mechanical rigidity. Thermal power ranging from 5 to 30 W was supplied to the evaporator while the device was flexed at 0 • , 45 • and 90 •. The thermal resistance of the FPHP ranged from 1.2 to 3.0 K W −1 depending on the operating conditions while the thermal resistance for a similar-sized solid copper reference was a constant at 4.6 K W −1. With 25 W power input, the thermal resistance of the liquid-vapor core of the FPHP was 23% of a copper reference sample with identical laminated polymer material. This work shows a promising combination of technologies that has the potential to usher in a new generation of highly flexible, lightweight, low-cost, high-performance thermal management solutions.

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