Performance Evaluation of Bent Heat Pipes

Johns, Agile; Thurlow, Ernie; Barez, Fred; Shabany, Younes

doi:10.1109/itherm.2018.8419621

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…The results of this study compare well to the reported studies. The figure also indicates that a linear extrapolation from 90º bend angles to 180º is reasonable in contrast to (11). On average, for bending angles up to 90º, 60% to 80% of performance loss compared to a straight heat pipe may be expected.…”

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

confidence: 78%

“…They reported that the heat transfer performance of the heat pipe was not significantly affected when it was bent between 30 and 120° with respect to the vertical axis. Johns et al [11] investigated the performance of heat pipes with a meshed-screen wick for bending angles ranging from 0° (straight) to 180° (U-shaped) with 45º increments. They concluded that the U-shaped heat pipe exhibited the largest temperature drop and that increasing the input power led to larger temperature differences for all bending angles.…”

Section: Introductionmentioning

confidence: 99%

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

confidence: 78%

Section: Introductionmentioning

confidence: 99%