Transient force analysis and bubble dynamics during flow boiling in silicon nanowire microchannels

Liquid-Vapor Phase-Change Heat Transfer on Functionalized Nanowired Surfaces and Beyond

“…[133][134][135][136][137][138][139][140][141][142] This has not only enabled the exciting enhancement of phase-change heat transfer performance [61][62][63]78,82,95,98,104,106,107,[143][144][145][146][147][148][149][150] but also furthered the fundamental understanding of boiling and condensation processes. 108,[151][152][153] Utilizing functionalized nanowired surfaces that we have most experiences on as an example, we review in this article the fundamental mechanisms that govern liquid-vapor phase-change processes and the efforts to enhance boiling and condensation heat transfer using micro/nanostructured surfaces. The perspective of future research directions is also presented.…”

“…The advances in the fabrication of micro/nanostructured surfaces have led to exciting improvements in liquid-vapor phase-change heat transfer. Benefiting from the advances in phase-change heat transfer enhancement using micro/nanostructured surfaces, heat transfer capability and thermal efficiency of some two-phase thermal management devices such as heat pipes, vapor chambers, and micro-channels, 2,104,[106][107][108]145,153,[319][320][321] have been significantly improved. Various nanostructures have been introduced to suppress the flow instability and improve flow boiling heat transfer performance in micro-channels, 104,[106][107][108]145,322,323 Significantly enhanced flow boiling performance has been demonstrated, including an early ONB, a delayed onset of flow oscillation, suppressed oscillating amplitude of temperature and pressure drop, and augmented HTC.…”

Bubble Unidirectional Transportation on Multipath Aerophilic Surfaces by Adjusting the Surface Microstructure

“…The manipulation of underwater gas bubbles has significant implications in various application scenarios that necessitate gas involvement as well as reactions that seek to eliminate the presence of gas, − such as mineral flotation, , wastewater treatment, catalytic reaction, − and medicine. − The successful implementation of fundamental laboratory functions, including gas separation, gas–liquid mixing, and other biological and chemical processes, on miniaturized devices also relies on the development of bubble manipulation technology . Furthermore, gas generation plays a substantial role in influencing boiling heat transfer. − Therefore, the investigation of bubble behaviors in aqueous environments, particularly the interaction between bubbles and solid–liquid phases, holds considerable theoretical and practical importance in the realm of bubble manipulation. − However, the behavior of air bubbles in an aqueous environment is elusive and challenging to control due to the influence of buoyancy. , There is an increasing urgency to develop an easily fabricated, sustainable, scalable, and energy-efficient solution for manipulating air bubbles.…”

Enhanced Flow Boiling in Microchannels Integrated with Hierarchical Structures of Micro-Pinfin Fences and Nanowires

“…11−13 Nanowires (NWs) can significantly promote the nucleate boiling and suppress the oscillation amplitudes of temperature and pressure drops via regulating the flow patterns inside the microchannels. 7,14,15 An interconnected structure inside the microchannel via microslots has also been explored to artificially enhance and sustain nucleate boiling, greatly improving the critical heat flux (CHF). 16,17 Artificially designed re-entrant cavities serving as vapor initiation sites have also been demonstrated to be an efficient way to benefit the bubble nucleation and reduce the subsequent flow oscillations.…”

“…Various methods such as surface modification, , nucleation enhancement, and sustaining strong mixing , have been explored to improve the thermal performance and stability of flow boiling in microchannels. Typical structures such as inlet restrictors and micro-pinfin have been induced to suppress the reverse flows and boiling instability by regulating the liquid supply. − Nanowires (NWs) can significantly promote the nucleate boiling and suppress the oscillation amplitudes of temperature and pressure drops via regulating the flow patterns inside the microchannels. ,, An interconnected structure inside the microchannel via microslots has also been explored to artificially enhance and sustain nucleate boiling, greatly improving the critical heat flux (CHF). , Artificially designed re-entrant cavities serving as vapor initiation sites have also been demonstrated to be an efficient way to benefit the bubble nucleation and reduce the subsequent flow oscillations. , …”