A review of thermal performance in multiple evaporators loop heat pipe

Qu, Yan; Wang, S.; YiShui, Tian

doi:10.1016/j.applthermaleng.2018.07.070

Cited by 44 publications

(6 citation statements)

References 53 publications

(89 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, there was an urgent need for an advanced cooling device with excellent thermal conductivity to solve these problems mentioned above. Heat pipes, as common thermal management devices, were widely used in the field of electronic heat dissipation due to their simple structure and high reliability [ 7 , 8 , 9 , 10 , 11 , 12 ]. The heat pipe may be classified as a thermosyphon, conventional heat pipe, loop heat pipe (LHP), micro heat pipe, rotating heat pipe, vapor chamber, and oscillating heat pipe (OHP).…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Thermal Performance of a Polymer-Based Flexible Oscillating Heat Pipe via 3D Printing Technology

Han

Chang

2023

Polymers

View full text Add to dashboard Cite

As flexible electronic technologies rapidly developed with a requirement for multifunction, miniaturization, and high power density, effective thermal management has become an increasingly important issue. The oscillating heat pipe, as a promising technology, was used to dissipate high heat fluxes and had a wide range of applications. In this paper, we reported the fabrication and heat transfer performance evaluation of a polymer-based flexible oscillating heat pipe (FOHP) prepared using 3D printing technology. The 3D-printed inner surface presented excellent wettability to the working fluid, which was beneficial for the evaporation of the working fluid. Ethanol was selected as the working fluid, and the influence of the filling ratios range of 30–60% on heat transfer performance was analyzed. It was found that a 3D-printed FOHP with a filling ratio of 40% presented the best heat transfer performance with the lowest thermal resistance, and the fabricated heat pipes could be easily bent from 0° to 90°. With the best filling ratio, the thermal resistance of the FOHPs increased with larger bending angles. In addition, the 3D-printed FOHP was successfully applied for the thermal management of flexible printed circuits, and the results showed that the temperature of flexible printed circuits was kept within 72 °C, and its service life was guaranteed.

show abstract

Section: Introductionmentioning

confidence: 99%

Fabrication and Thermal Performance of a Polymer-Based Flexible Oscillating Heat Pipe via 3D Printing Technology

Han

Chang

2023

Polymers

View full text Add to dashboard Cite

show abstract

“…As a result, the use of passive cooling methods such heat pipes (at microscales) are made possible by the miniaturized cooling of these devices with strong heat flux dissipation of the order of 10 4 to 10 6 W/m 2 . The necessity for fundamental research in porous media heat transfer originates from the need for a better understanding of thermal engineering applications that uses porous materials such as the evaporator portion of the heat pipe where heat needs to be dissipated [4,5]. Porous media are distinguished from non-porous media by two fundamental characteristics: a large specific surface area and the tortuous morphology of capillaries.…”

Section: Introductionmentioning

confidence: 99%

Validation of Local Thermal Equilibrium (LTE) in Porous Media for Variation in Flow rate and Permeability: Transient Analysis

Rudresh

Rathore

Mehta

2023

Preprint

View full text Add to dashboard Cite

The usage of porous media is one of the effective ways to augment the heat transfer in micro-to-mini scale channels due to its enormously high surface area, enhanced thermophysical properties, and dispersion effect to transfer the thermal energy between the heated channel wall and fluid at a faster rate. However, there is ambiguity associated with the extent of thermal equilibrium between the solid and fluid phases, and therefore, also in the selection of suitable heat transfer model. In the current study, the numerical analysis of thermo-hydrodynamics for the porous media filled in the channel for incompressible laminar forced convective flow with varying Reynolds number and Darcy number is delt. The validity of the local thermal equilibrium (LTE) condition is performed for transient case to study the effects of the parameters that governs the flow and thermal effects, i.e., Reynolds number (Re) in the range of 10 < Re < 1000 and Darcy number (Da) in the range of 10^-6 < Da < 10^0 . The results of the present study show that for higher range of flow rate (Re > 100), the LTE assumption is valid for all ranges of Da, however, for the lower range of flow rate (Re < 100), the LTE assumption deviates for higher Da

show abstract

“…Improving surface structures [1], which typically include grooves, fins, and porous surfaces of various shapes, is the main approach adopted for enhancing boiling heat transfer. The porous surface heat exchanger developed in the 1960s has had wide application prospects in the industry due to its high boiling efficiency, low-temperature difference boiling, high critical heat flux (CHF), and good anti-fouling capability [2].…”

Section: Introductionmentioning

confidence: 99%

Heat Exchanging Grid Structures Based on Laser-Based Powder Bed Fusion: Formation Process and Boiling Heat Transfer Performance

et al. 2022

View full text Add to dashboard Cite

Microchannel structures possess high efficiency and high boiling heat transfer coefficient of two-phase flow. In particular, the grid structure has the advantages of a simple pattern, large load capacity, and good surface adaptability. Employing the laser-based powder bed fusion (L-PBF) manufacturing technology, a new method of forming heat transfer grids with a controllable structure is proposed in this study. The formation principle, process, and the reasons for improvements in the boiling heat transfer performance were investigated with stainless steel materials. Laser scanning with varying scan spacings was used to prepare multiple structures with different grid widths and wall heights. On this basis, the porosity and pore morphology of the grid structures were analyzed, followed by pool boiling heat transfer experiments. The results revealed that the grid structure significantly affected the nucleate boiling behavior and increased the critical heat flux (CHF). It was found that the 0.5 mm sample exhibited optimum critical heat transfer performance, with an improvement of 10–27% compared to those of the other four samples (minimum of 63.3 W·cm−2 and maximum of 93.9 W·cm−2). In addition, for samples with a grid width greater than 0.5 mm, the boiling slightly decreased by <5%. When the grid width was further increased, the flow resistance effect and the bubble synapse generation effect tended to converge. In these cases, boiling heat transfer only occurred in a single phase along the direction of the medium wall thickness, thus failing to achieve two-phase heat transfer through bubble growth and collapse.

show abstract

A review of thermal performance in multiple evaporators loop heat pipe

Cited by 44 publications

References 53 publications

Fabrication and Thermal Performance of a Polymer-Based Flexible Oscillating Heat Pipe via 3D Printing Technology

Fabrication and Thermal Performance of a Polymer-Based Flexible Oscillating Heat Pipe via 3D Printing Technology

Validation of Local Thermal Equilibrium (LTE) in Porous Media for Variation in Flow rate and Permeability: Transient Analysis

Heat Exchanging Grid Structures Based on Laser-Based Powder Bed Fusion: Formation Process and Boiling Heat Transfer Performance

Contact Info

Product

Resources

About