A vertical heat pipe: an experimental and statistical study of the thermal performance in the presence of low-frequency vibrations

Alaei, Amir; Kafshgari, Morteza Hasanzadeh; Rahimi, Shahab Kashani

doi:10.1007/s00231-012-1057-z

Cited by 19 publications

(10 citation statements)

References 16 publications

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“…Due to the low height, the developed LED luminaire can be applied both for lighting the living spaces with low ceilings and for internal lighting the cabins, bodies, staterooms and other premises of many transportations. Specificity of exploitation conditions inherent to transport vehicles places a demand to the luminaire producer performing the thermal calculations for its cooling system to take into account the possible effects of vibrations, accelerations and shocks on characteristics of heat pipes [39][40][41][42][43][44][45][46] and, accordingly, of the whole luminaire.…”

Section: Recommendations For Practical Application Of the Developed Lmentioning

confidence: 99%

Optimization of the cooling system design for a compact high-power LED luminaire

Pekur¹,

Nikolaenko²,

Сорокин³

2020

Semicond. phys. quantum electron. and optoelectron.

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Using the method of computer modelling, considered in this paper is optimization of a passive air system design for cooling the powerful LED luminaire based on heat pipes and cooling rings. Thermal and mass characteristics of the cooling system have been studied for various design parameters: distance between rings, thickness of ring materials and thermal loads. It has been shown that, to provide a minimal case temperature of LED source, the optimal distance between cooling rings should be 6 mm, but in this case the mass of cooling system is not least. To reduce the luminaire mass, it is reasonable to choose the distance between the cooling rings equal to 8 mm. Then the temperature of light source increases by only 1.8 °С, or by 2.2%, while the mass of cooling system reduces by 1357 g, or by 20.5%. At the same time, lowering the ring thickness from 2 down to 0.8 mm can in addition reduce this mass by 2700 g, or by 48.6%. However, when doing so the temperature of LED source case is increased by 5.9 °С. The offered cooling system based on heat pipes is capable to provide the thermal resistance 0.131 °С/W when scattering the thermal power 500 W under the maximum temperature of LED source crystal 135.5 °С. Recommendations for application of the developed cooling system have been formulated.

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Section: Recommendations For Practical Application Of the Developed Lmentioning

confidence: 99%

Optimization of the cooling system design for a compact high-power LED luminaire

Pekur¹,

Nikolaenko²,

Сорокин³

2020

Semicond. phys. quantum electron. and optoelectron.

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“…Результаты, представленные на рис. 8, означают увеличение интенсивности парообразования в капилляр-но-пористом испарителе и увеличение скорости роста пузырьков пара по сравнению с известными результатами стационарного роста пузырьков пара в большом объеме перегретой жидкости [31,34,35]: Показатель степени 0,5 для параметра времени τ, в уравнении (12), отражает стационарный рост пузырьков пара во времени в большом объеме перегретой жидкости без учета относительного движения фаз. Однако в реальности из-за разницы плотностей происходит конвективное движение -пузырьки всплывают в гравитационном силовом поле 1g, и в экспериментальных данных, описывающих скорость роста пузырьков пара во времени, показатель степени оказывается несколько большим, достигая значения ~ (0,6-0,7) [34,35].…”

Section: вибрационное повышение теплопередачи тт результаты и обсуждениеunclassified

“…Alaei А. et all в работах [11,12] опубликовали результаты исследований влияния низкочастотных продольных вибраций амплитудой до 2 мм на параметры теплопередачи вертикально ориентированной ТТ. Авторы проводили измерения теплового сопротивления ТТ при различных тепловых нагрузках, коэффициентах заполнения рабочей жидкостью и вибрационных частотах, ими зафиксировано снижение теплового сопротивления ТТ до величины 0,064 К/Вт при частоте внешних продольных вибраций 30 Гц.…”

Section: Introductionunclassified

Experimental study of linear heat pipes thermal characteristics under the external vibrations effect

Seryakov¹,

Rudetransservice²,

Konkin³

et al. 2020

Journal IAR

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Проведено экспериментальное исследование влияния продольных внешних вибраций на величину теплопередающих характеристик тепловых труб (ТТ) с конфузорно-диффузорным профилем парового канала и большим количеством рабочей жидкости в порах капиллярно-пористой внутренней вставки. При большом температурном напоре на соединенный со вставкой контактной сваркой капиллярно-пористый испаритель ТТ образование пара приобретает нестационарный характер. Из результатов измерений следует, что при воздействии на ТТ внешних продольных гармонических колебаний с ограниченной амплитудой и с частотой, равной частоте возникшей внутренней нестационарности, переносные характеристики ТТ проявляют резонансный характер. Увеличение коэффициента теплопередачи происходит за счет интенсификации роста паровых пузырьков в капиллярно-пористом испарителе при наложении внешних вибраций.Ключевые слова: коэффициент теплопередачи, внутренние пульсации в тепловых трубах, внешние вибрации, резонанс.

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“…Several studies focus on the effect of vibrations on the thermal heat pipe performance. In [21], the presence of low-frequency vibrations between 0 and 30 Hz was found to decrease the thermal resistance of a copper heat pipe in vertical, gravity-assisted orientation. Similar results were obtained in [22] with longitudinal vibrations on a heat pipe in horizontal orientation.…”

Section: Introductionmentioning

confidence: 98%

Experimental investigation of heat pipe performance under translational acceleration

Voigt

Drossel

2021

Heat Mass Transfer

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Heat pipes provide highly efficient heat transfer and are powerful tools in thermal management systems. In contrast to most established systems, heat pipes operating within moving systems such as electric vehicles or machine tools are exposed to unsteady acceleration forces. In order to guarantee proper heat pipe function in scenarios involving accelerated movement, it is necessary to examine the effect of acceleration forces on the heat pipe behavior. This paper presents experimental investigations on the thermal performance of translationally moving heat pipes. The designed experimental set-up consists of a measurement platform mounted to a linear direct drive. By obtaining the temperature gradient between evaporator and condenser section, the thermal resistance of heat pipes is determined at standstill and under linear motion. The experiments were conducted using heat pipes with sintered, mesh and grooved wicks. The results demonstrate the motion influence on the thermal resistances depending on the heat pipe orientation and heat input.

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A vertical heat pipe: an experimental and statistical study of the thermal performance in the presence of low-frequency vibrations

Cited by 19 publications

References 16 publications

Optimization of the cooling system design for a compact high-power LED luminaire

Optimization of the cooling system design for a compact high-power LED luminaire

Experimental study of linear heat pipes thermal characteristics under the external vibrations effect

Experimental investigation of heat pipe performance under translational acceleration

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