Microgrooved Heat Pipe

Suman, Balram

doi:10.1016/s0065-2717(08)41001-8

Cited by 16 publications

(9 citation statements)

References 116 publications

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“…Dilute aqueous solutions of long-chain alcohols (such as 1-butanol and 1-pentanol) have been proposed as working fluids for heat pipes and vapor-chamber spreaders, which are passive devices (devices with no moving mechanical parts) that employ liquid-vapor phase-change and surface-tension-driven phenomena to achieve continuous (cyclical) operation at high heat fluxes with relatively low temperature differences between the heated (evaporator) and cooled (condenser) sections. − Such devices are very useful (and commonly used) for thermal management of electronic devices and illumination systems based on light-emitting diodes (LEDs). − , Dilute aqueous solutions of 1-butanol and 1-pentanol (and also 1-hexanol and 1-heptanol) are of interest as working fluids in the above-mentioned thermal-management devices as they exhibit a positive gradient of surface tension with temperature (at about 313.15 K and higher; depending on the alcohol), which enhances the return of the liquid phase from the cooled to the heated sections. − …”

Section: Introductionmentioning

confidence: 99%

Densities of Dilute Aqueous Solutions of 1-Butanol and 1-Pentanol at Atmospheric Pressure and Temperatures in the Range of 283.15 to 353.15 K

2021

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Mass densities of dilute aqueous solutions of 1-butanol and 1pentanol (with alcohol concentrations between 0.07 to 0.7 and 0.006 to 0.06 mol• kg −1 , respectively) were determined at atmospheric pressure and temperatures in the range of 283.15 to 353.15 K using a custom-built volume dilatometer. The dilatometer was first calibrated using water, and it was then benchmarked using water and aqueous solutions of ethanol. Evaporation in the experiments with water and the alcohol solutions was prevented by adding a small amount of oil (about 0.2 mL) over the liquid surface that was exposed to the ambient air. The density data complement and extend those available in the published literature. They also show that at alcohol concentrations less than 0.01 mol•kg −1 , the density of such solutions may be reasonably assumed to be the same as that of water or calculated using the idealsolution assumption. For solutions with higher alcohol concentrations, however, the aforementioned assumptions are inappropriate, as they lead to density values that differ from the data presented in this paper by amounts that exceed the expanded uncertainty of the underlying measurements.

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Section: Introductionmentioning

confidence: 99%

Densities of Dilute Aqueous Solutions of 1-Butanol and 1-Pentanol at Atmospheric Pressure and Temperatures in the Range of 283.15 to 353.15 K

2021

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“…Micro heat pipe – a microscale electronics cooling device, has received considerable interests among the thermal management community. In view of the demanding needs for electronics cooling and advances in miniaturization of electronic components, micro heat pipe manifests itself to be a very promising candidate for effective cooling of electronic equipment, because of its high reliability, efficiency and cost-saving features (Babin et al , 1990; Suman, 2009; Liu and Chen, 2013; Gan and Hung, 2015; Sun et al , 2017; Qu et al , 2017; Ye et al , 2018; Yoon and Kim, 2018; Chen et al , 2019; Wang et al , 2019). Micro heat pipe is a heat transfer device with extremely high thermal conductance.…”

Section: Introductionmentioning

confidence: 99%

Gravitational effects on electroosmotic flow in micro heat pipes

Chang

Hung

2019

HFF

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Purpose This paper aims to investigate the coupled effects of electrohydrodynamic and gravity forces on the circulation effectiveness of working fluid in an inclined micro heat pipe driven by electroosmotic flow. The effects of the three competing forces, namely, the capillary, the gravitational and the electrohydrodyanamic forces, on the circulation effectiveness of a micro heat pipe are compared and delineated. Design/methodology/approach The numerical model is developed based on the conservations of mass, momentum and energy with the incorporation of the Young–Laplace equation for electroosmotic flow in an inclined micro heat pipe incorporating the gravity effects. Findings By inducing electroosmotic flow in a micro heat pipe, a significant increase in heat transport capacity can be attained at a reasonably low applied voltage, leading to a small temperature drop and a high thermal conductance. However, the favorably applied gravity forces pull the liquid toward the evaporator section where the onset of flooding occurs within the condenser section, generating a throat that shrinks the vapor flow passage and may lead to a complete failure on the operation of micro heat pipe. Therefore, the balance between the electrohydrodyanamic and the gravitational forces is of vital importance. Originality/value This study provides a detailed insight into the gravitational and electroosmotic effects on the thermal performance of an inclined micro heat pipe driven by electroosmotic flow and paves the way for the feasible practical application of electrohydrodynamic forces in a micro-scale two-phase cooling device.

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“…Most of the investigation on PHP are carried with in this range and concluded that suits for electronic cooling but when considering the space occupied by this PHP system, it is more than the existing heat sink setup, example heat sink employed in on-chip cooling. Bo ≤ 1, condition, makes the heat pipe to fall into category of Micro Heat Pipe (MHP) [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of Micro-Pulsating Heat Pipe

Jian¹

2019

IJEAT

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In this study, thermal performance of MPHP is investigated computationally. A case with 0.7mm hydraulic diameter with 7 turns is considered for the study. Simulation is carried out using ANSYS-FLUENT® software by considering water as working fluid with the help of VOF model. Computational study shows the oscillation of fluid inside and formation of new vapor slugs. The heat input is varied from 1.2 W to 4.8 W in the step of 1.2. Flow circulation inside the MPHP is not unidirectional and frequently changes with the pressure disturbance created in the channels. The temperature profile from computational study shows the startup condition is changing with heat input. Thermal resistance of the MPHP decreases with increase in heat input and the corresponding thermal resistance found to be varied from 3.94 to 3.65 K/W.

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Microgrooved Heat Pipe

Cited by 16 publications

References 116 publications

Densities of Dilute Aqueous Solutions of 1-Butanol and 1-Pentanol at Atmospheric Pressure and Temperatures in the Range of 283.15 to 353.15 K

Densities of Dilute Aqueous Solutions of 1-Butanol and 1-Pentanol at Atmospheric Pressure and Temperatures in the Range of 283.15 to 353.15 K

Gravitational effects on electroosmotic flow in micro heat pipes

Thermal Performance of Micro-Pulsating Heat Pipe

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