Effects of a surface-tension gradient on the performance of a micro-grooved heat pipe: an analytical study

Suman, Balram

doi:10.1007/s10404-008-0282-8

Cited by 21 publications

(5 citation statements)

References 32 publications

(65 reference statements)

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“…J.Ha et al [42] and V. Sartre et al [43] also studied aluminum/ammonia triangle MHP. Balram Suman et al [44] studied the effect of surface tension gradient on the performance of microgrooved heat pipes, finding that the effect of surface tension gradient increased with the increase of the corner angle of the polygonal heat pipe. The change of liquid temperature and surfactant concentration have an undesirable effect on the surface tension gradient.…”

Section: 24mentioning

confidence: 99%

Advances and prospects in heat pipe: A critical eview

Chen¹,

Yu²,

Hao³

et al. 2021

E3S Web Conf.

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As an efficient heat transfer element, the heat pipe has excellent thermal conductivity. It has important application value in chemical, building materials, metallurgy, power engineering, bioengineering and other fields. In order to systematically analyze the development trend of heat pipe, the paper takes the literature on heat pipe from 2010 to 2020 included in the Web of Science database as the data source, and analyzes the collected data with information visualization software CiteSpace to draw out the heat pipe technology countries, institutions, research authors distribution network map, showing the technology research power distribution and cooperation in scientific research. The use of software co-occurrence analysis of the hot science and technology of heat pipe technology, at the same time, the key words co-occurrence network diagram and literature citation network are used to analyze the research hotspots, research frontiers and trends of heat pipe technology.

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Section: 24mentioning

confidence: 99%

Advances and prospects in heat pipe: A critical eview

Chen¹,

Yu²,

Hao³

et al. 2021

E3S Web Conf.

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“…Suman and his colleagues conducted studies of micro heat pipes with various crosssectional geometries using 1D transport model. Besides the capillary pressure and the wall shear stress [61], they have incorporated the effect of body force (gravity) [62][63][64], the inertia in the liquid [62,63], heat conduction through the substrate [65], and the linear variation of the surface tension [63] (e.g., due to an interfacial temperature gradient). However, their treatment of transport in the gas phase was incomplete in all of these studies.…”

Section: One-sided Transport Modelsmentioning

confidence: 99%

Buoyancy-Thermocapillary Convection of Volatile Fluids in Confined and Sealed Geometries

Qin

2017

Springer Theses

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Convection in a layer of fluid with a free surface due to a combination of thermocapillary stresses and buoyancy is a classic problem of fluid mechanics. It has attracted increasing attentions recently due to its relevance for two-phase cooling. Many of the modern thermal management technologies exploit the large latent heats associated with phase change at the interface of volatile liquids, allowing compact devices to handle very high heat fluxes. To enhance phase change, such cooling devices usually employ a sealed cavity from which almost all noncondensable gases, such as air, have been evacuated. Heating one end of the cavity, and cooling the other, establishes a horizontal temperature gradient that drives the flow of the coolant. Although such flows have been studied extensively at atmospheric conditions, our fundamental understanding of the heat and mass transport for volatile fluids at reduced pressures remains limited. A comprehensive and quantitative numerical model of two-phase buoyancy-thermocapillary convection of confined volatile fluids subject to a horizontal temperature gradient has been developed, implemented, and validated against experiments as a part of this thesis research. Unlike previous simplified models used in the field, this new model incorporates a complete description of the momentum, mass, and heat transport in both the liquid and the gas phase, as well as phase change across the entire liquid-gas interface.Numerical simulations were used to improve our fundamental understanding of the importance of various physical effects (buoyancy, thermocapillary stresses, wetting properties of the liquid, etc.) on confined two-phase flows. In particular, the effect of noncondensables (air) was investigated by varying their average concentration from that corresponding to ambient conditions to zero, in which case the gas phase becomes a pure vapor. It was found that the composition of the gas phase has a crucial impact on heat and mass transport as well as on the flow stability.A simplified theoretical description of the flow and its stability was developed and used xvi to explain many features of the numerical solutions and experimental observations that were not well understood previously. In particular, an analytical solution for the base return flow in the liquid layer was extended to the gas phase, justifying the previous ad-hoc assumption of the linear interfacial temperature profile. Linear stability analysis of this two-layer solution was also performed. It was found that as the concentration of noncondensables decreases, the instability responsible for the emergence of a convective pattern is delayed, which is mainly due to the enhancement of phase change.Finally, a simplified transport model was developed for heat pipes with wicks or microchannels that gives a closed-form analytical prediction for the heat transfer coefficient and the optimal size of the pores of the wick (or the width of the microchannels).

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“…The results revealed that the surface with a gradient wettability increased the maximum heat input of the MHP up to 49.7%, compared with that of uniform surface wettability. The effect of surface-tension gradient on the thermal performance of a MHP has been numerically investigated by Suman [57]. Results show that the liquid pressure drop across the MHP can be decreased by about 90%, and the maximum heat throughput can be increased by about 20% with a favorable surface-tension gradient.…”

Section: Novel Designs For Performance Improvementmentioning

confidence: 99%

MEMS-Based Micro-heat Pipes

Qu¹,

Wang²

2016

Electronics Cooling

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Micro-electro-mechanical systems (MEMS)-based micro-heat pipes, as a novel heat pipe technology, is considered as one of the most promising options for thermal control applications in microelectronic circuits packaging, concentrated solar cells, infrared detectors, micro-fuel cells, etc. The operating principles, heat transfer characteristics, and fabrication process of MEMS-based micro-grooved heat pipes are firstly introduced and the state-of-the-art of research both experimental and theoretical is thoroughly reviewed. Then, other emerging MEMS-based micro-heat pipes, such as micro-capillary pumped loop, micro-loop heat pipe, micro-oscillating heat pipe, and micro-vapor chamber are briefly reviewed as well. Finally, some promising and innovatory applications of the MEMS-based micro-heat pipes are reported. This chapter is expected to provide basic reference for future researches.

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Effects of a surface-tension gradient on the performance of a micro-grooved heat pipe: an analytical study

Cited by 21 publications

References 32 publications

Advances and prospects in heat pipe: A critical eview

Advances and prospects in heat pipe: A critical eview

Buoyancy-Thermocapillary Convection of Volatile Fluids in Confined and Sealed Geometries

MEMS-Based Micro-heat Pipes

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