Squid‐like soft heat pipe for multiple heat transport

Kang, Zhanxiao; Jiang, Shoukun; Hong, Yang; Fan, Jintu

doi:10.1002/dro2.25

Cited by 17 publications

(8 citation statements)

References 37 publications

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“…More details can be found in the author's previous work [32]. The Lee model [33] is selected as the phase change model in Equations ( 9)- (11):…”

Section: Governing Models and Equationsmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulation of Subcooled Flow Boiling in a Threaded Tube and Investigation of Heat Transfer and Bubble Behavior

Lei,

Wang,

Xie

et al. 2023

Energies

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Three-dimensional subcooled flow boiling of R134a in a threaded tube was numerically simulated at the conditions of 200~400 kW/m2 heat flux, 3~20 K inlet subcooling, and 0.2~0.6 m/s inlet velocity. The bubble behavior in the horizontal threaded tube with 0.581 mm thread tooth height was observed. The effect of heat flux, inlet subcooling, and inlet velocity on bubble departure diameter and heat transfer coefficient were explored. The results presented the whole growth process of five kinds of bubbles. It was found that the bubbles either collapsed in cold liquid after leaving the heating wall or grew along the axial direction and contacted the heating wall. And there was no bubble sliding during the growth. In addition, the most important and special characteristic of bubble behavior in threaded tubes was the phenomenon of the bubble passing through the cavity. The coalescence and breakup behavior occurred after the bubble passed through the cavity. According to the discussions of the departure diameter and heat transfer coefficient, it was inferred that the bubble departure diameter increased with the increase of heat flux from 200~400 kW/m2 and subcooling from 3~20 K while decreasing with the increase of inlet velocity from 0.2~0.6 m/s. And due to the influence of the threaded tube structure, there are special points in the change of bubble departure diameter. The heat transfer coefficient of the bubbles in the threaded tube was higher than the smooth tube, which was increased by 1.5~12.5%. The heat transfer coefficient increased with the increase of heat flux and subcooling and is closely related to the bubble departure diameter.

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“…More details can be found in the author's previous work [32]. The Lee model [33] is selected as the phase change model in Equations ( 9)- (11):…”

Section: Governing Models and Equationsmentioning

confidence: 99%

“…Bubble generation requires a mass of latent heat and transports energy from a hot region to a cold liquid in subcooled flow boiling [8]. Subcooled flow boiling is applied to many fields, such as pulsating heat pipes, refrigeration, nuclear, electronic cooling, biological engineering, and aerospace [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Subcooled Flow Boiling in a Threaded Tube and Investigation of Heat Transfer and Bubble Behavior

Lei,

Wang,

Xie

et al. 2023

Energies

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show abstract

“…He also pointed out that the future development of microfluidics would be in the design and manufacturing systems for microfluidic devices. Due to the merits of microchannels, such as compactness, microscale, and ease of integration discovered in the past few decades [26], the applications of microfluidic devices have been also boosted in various fields, such as heat sinks [27], heat transport [28], diagnostics [29], detection [30], biomedical engineering [31], production of materials [32], and reactors [33]. Recently, more and more complex microfluidic devices have been proposed [34], including capillaric circuits [35], wearable electronic devices [36], microrobotics [37,38], and triboelectric generators [39,40].…”

Section: Introductionmentioning

confidence: 99%

Functional microfluidics: theory, microfabrication, and applications

Xie,

Zhan,

et al. 2024

Int. J. Extrem. Manuf.

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Microfluidic devices are composed of microchannels with a diameter ranging in ten to a few hundred micrometers. Thus, quite small (10-9 to 10-18 litres) amount of liquid can be manipulated by such a precise system. In the past three decades, significant progresses in materials, microfabrication, and various applications have boosted the development of promising functional microfluidic devices. In this review, the recent progresses on novel microfluidic devices with various functions and applications are presented. First, the theory and numerical methods for studying the performance of microfluidic devices are briefly introduced. Then, materials, and fabrication methods of functional microfluidic devices are summarized. Next, from the viewpoint of the applications of the microfluidic devices, the recent significant advances in heat sink, clean water production, chemical reactions, sensor, biomedical field, capillaric circuits, flexible and wearable electronic devices, microrobotics, etc., in turns are then highlighted. Finally, personal perspectives on the challenges and future developments of functional microfluidic devices, aiming to motivate researchers from the fields of engineering, materials, chemistry, mathematics, physics, etc. working together to promote further development and applications of functional microfluidic devices, for the specific purpose of carbon neutrality are provided.

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“…It can achieve small temperature drops, exceptional flexibility, and easy control without using external power. Hence, it has been widely used for thermal management and energy conversion 2–6 . Inside a heat pipe, working fluid acquires heat through evaporation/boiling in the evaporator section.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, it has been widely used for thermal management and energy conversion. [2][3][4][5][6] Inside a heat pipe, working fluid acquires heat through evaporation/ boiling in the evaporator section. Vapor flows to the other end and rejects heat through condensation in the condenser section.…”

Section: Introductionmentioning

confidence: 99%

Sustainable dropwise condensation enabled ultraefficient heat pipes

Wei

Luo

Wang

et al. 2023

Droplet

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Heat pipes play a critical role in determining the operations, safety, and energy efficiency of electronics. The main focus to improve the heat pipe performance is on the evaporator design or wicking structures. However, the intrinsic limitation comes from the condenser, which is fundamentally constrained by inefficient filmwise condensation (FWC). In this study, we successfully achieved a peak effective thermal conductivity (k eff ) of ~140 kW/(m•K) on widely used groove heat pipes by implementing sustianble dropwise condensation (DWC) and integrating with enhanced evaporator. To better understand the working mechanisms of the ultraefficient heat pipe, both the evaporator and condenser of the heat pipes have been modified accordingly. Our results show that up to 296% enhancements on the k eff can be achieved under various inclination angles by only inducing DWC in the condenser section. The drawback of temperature fluctuations induced by DWC in smooth heat pipes appears to be effectively solved using the grooves-wicking structure. Furthermore, by integrating the nanostructured evaporator, the k eff of the heat pipe can be boosted up to 517% compared to conventional groove heat pipes.This study, for the first time, demonstrates the huge potential of engineering both the condenser and evaporator simultaneously in developing ultraefficient heat pipes.

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Squid‐like soft heat pipe for multiple heat transport

Cited by 17 publications

References 37 publications

Numerical Simulation of Subcooled Flow Boiling in a Threaded Tube and Investigation of Heat Transfer and Bubble Behavior

Numerical Simulation of Subcooled Flow Boiling in a Threaded Tube and Investigation of Heat Transfer and Bubble Behavior

Functional microfluidics: theory, microfabrication, and applications

Sustainable dropwise condensation enabled ultraefficient heat pipes

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