Biomimetic self-pumping transpiration cooling for additive manufactured porous module with tree-like micro-channel

Huang, Gan; Zhu, Yinhai; Liao, Zhirong; Xu, Ruina; Jiang, Pei-Xue

doi:10.1016/j.ijheatmasstransfer.2018.07.143

Cited by 57 publications

(14 citation statements)

References 22 publications

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“…Recently, Tsang and Sun [156] proposed and studied intermittent spray cooling using a self-rewetting inverse-Marangoni fluid and found that with a selfrewetting fluid, a larger surface area could be cooled without an increase in the number of nozzles, and surface temperatures were controlled to be lower, more uniform and more stable. Despite the progress in intermittent spray cooling, the control of the spray system according to external environment variations needs to be further developed, either by applying an advanced algorithm to realize initiative control or by designing the system based on the physical nature to realize self-adaptive cooling, which can be inspired by capillary-induced self-pumping transpiration cooling [157].…”

Section: Conclusion and Future Concernsmentioning

confidence: 99%

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Wang

Jiang

2021

Journal of Electronic Packaging

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The rapid development of electronics, energy and propulsion systems has led us to the point where their performances are limited by cooling capacities. Heat fluxes of 10~100, even over 1,000 W/cm2 need to be dissipated with minimum coolant flow rate in next-generation power electronics. Spray cooling is a high heat flux, uniform and efficient cooling technique proven effective in various applications. However, its cooling capacity and efficiency need to be further improved to meet next-generation ultrahigh-power applications. Engineering of surface properties and structures can fundamentally affect the liquid-wall interactions, thus becoming the most promising way to enhance spray cooling. However, the unclear mechanisms of surface-enhanced spray cooling cause lack of guiding principles for surface design. Here, progress in spray cooling on surfaces with structures of different scales are reviewed and their performances evaluated and compared. Spray cooling can achieve critical heat flux (CHF) above 945 W/cm2 and heat transfer coefficient (HTC) up to 57 W/cm2K on structured surfaces for pressurized nozzle and CHF and HTC up to 1250 W/cm2 and 250 W/cm2K, respectively, on a smooth surface with the assistance of secondary gas flow. CHF enhancement of 110% was achieved on hybrid micro- and nanostructured surfaces. A clear map of enhancement mechanisms is proposed after analysis. Some future concerns are also proposed. This work helps the understanding and design of engineered surfaces in spray cooling and provides insights for interdisciplinary applications of heat transfer and advanced engineering materials.

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Section: Conclusion and Future Concernsmentioning

confidence: 99%

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Wang

Jiang

2021

Journal of Electronic Packaging

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“…Such a flow manifold is possible to be fabricated using additive manufacturing techniques. 25 The combustor section of the practical HR4 reactor comprises a monolith structure with square channels that fill the entire region of the combustor section. Modeling of the combustion reaction that takes place inside this monolith type combustor section of the practical reactor, within the flow through type straight channels of the theoretical combustor region shown in Figure 2, is elucidated in section 2.2.3.…”

Section: Cfd Modelingmentioning

confidence: 99%

Minimizing Heat Transfer Resistance in an Integrated Methanol Steam Reformer Designed Using Space-Filling Curves

Khan

Jayanti

2022

Ind. Eng. Chem. Res.

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Conventional packed bed methanol steam reformers producing hydrogen for PEM fuel cells have an inherent trade-off problem between simultaneously attaining high methanol conversion and low carbon monoxide production, owing to high thermal resistance in the packed bed. A sophisticated reformer design using Hilbert’s space-filling curves is proposed and demonstrated using CFD modeling and simulation. The reactor comprises a flow-through domain divided into two interdigitating but nonmixing continua that are separated by a thin wall, providing high interfacial area for heat transfer and surface reactions. The interfacial wall is modeled as coated with catalyst for performing reforming on one side and fuel cell anode exhaust hydrogen combustion on the other side. About 84% methanol conversion and CO production less than 2% was achieved due to remarkable reduction in heat transfer resistance. External mass transfer controlled the reactor operation, while reaction kinetics exhibited nontrivial influence on reactor performance.

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“…It is controlled by nonequilibrium feedback, in which water is continuously pumped from the roots through the plant body as the leaves and stem evaporate water-in a large tree, the amount of water transpirated may reach tons per day. 15,32,33 As we show below, we use artificial transpiration as the continuous input that is necessary to maintain a nonequilibrium feedback in our artificial plant.…”

Section: Turgor-mediated Plant Movement and Transpirationmentioning

confidence: 99%

Self-Regulating Plant Robots: Bioinspired Heliotropism and Nyctinasty

Cezan

Baytekin

2020

Soft Robotics

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Self-regulation (or so-called homeostasis) is a property of all living organisms to maintain an internal stable state through specialized biofeedback mechanisms under varying external and internal conditions. Although these feedback mechanisms in living organisms are complex networks and hard to implement one-to-one in artificial systems, the new approaches in soft robotics may benefit from the concept of self-regulation-especially in the new endeavors of making untethered, autonomous soft robots. In this study, we show a simple system, in which plant robots display heliotropism (sun tracking) and nyctinasty (leaf opening) through artificial self-regulation attained through a bioinspired transpiration mechanism. The feedback involves dehydration/hydration and transpiration events that keep the stem continuously in a metastable position, which maximizes light on plant leaves and the efficiency of light harvesting when solar panels are attached on leaves. We also demonstrate that this artificial feedback can be regulated by doping with light-absorbing chemicals or by changing the geometry of the system, and it can further be expanded to other lightweight systems. Implementing self-regulation into (soft) robots through bioinspired material feedback is beneficial not only for energy efficiency and harvesting but also for achieving embodied intelligence in autonomous soft robots.

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Biomimetic self-pumping transpiration cooling for additive manufactured porous module with tree-like micro-channel

Cited by 57 publications

References 22 publications

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Minimizing Heat Transfer Resistance in an Integrated Methanol Steam Reformer Designed Using Space-Filling Curves

Self-Regulating Plant Robots: Bioinspired Heliotropism and Nyctinasty

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