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Publications
Publications (48)
The present work aims to comprehensively review fluid flow instability at supercritical pressure to help readers understand its mechanisms, current research status, existing challenges, and future research directions efficiently and concisely. The review covers various aspects, including instability under various scenarios and distinct characterist...
针对传统离散相模型 (DPM) 由于未考虑颗粒体积影响导致无法准确预测相变微胶囊悬浮液 (MEPCMS) 的压降，采用修正 DPM 模型，准确预测 MEPCMS 在芯片阵列中的流动传热特性，考察芯片发热功率及功率分布 对冷却特性的影响规律。结果表明，MEPCMS 相比于纯基液，平均 Nusselt 数 Nu av 最高可提升 30.03%，壁面温升 ΔTw 最高可降低 7.19%，综合性能评价因子 ƞ 均大于 1；芯片功率越高越靠近出口，悬浮液冷却效果提升越明显， 高功率芯片靠近进口有利于抑制芯片的最高温升，靠近出口时悬浮液 Nu av 的增幅大于摩擦因子和进出口压降的增 幅，可见其受发热功率的影响较小，受功率分布的影响较大。为 MEPCMS 在细小通道内流动传热特性的认识及 在电子器件热管...
The thermocapillary-driven core release of double-emulsion droplets offers advantages 1 such as simplicity in implementation and a broad range of applications, providing unique 2 strengths in the field of core component release. However, the characteristics and mech-3 anisms related to thermocapillary-driven core release were still unknown. This ar...
To enhance focusing performance, we proposed an integrated microchannel with expansion-contraction arrays (ECA) on the inner wall of the curved microchannel (CIECA) and compared it with a straight microchannel with ECA (SECA) as well as the traditional integrated microchannel of ECA on the outer wall of the curved channel (COECA). We investigated t...
Microencapsulation phase change material slurry (MEPCMS) becomes a potential working fluid for cooling high energy density miniaturized components, thanks to the latent heat absorption of particles in the heat transfer process. In this work, the Discrete Phase Model (DPM) based on the Euler-Lagrangian method is used to numerically investigate the c...
As a new functional thermal fluid, microencapsulated phase change material slurry (MEPCMS) has development potential in thermal management and other fields. In this study, the discrete phase model (DPM) was used to investigate the heat transfer characteristics of MEPCMS in a horizontal rectangular minichannel under nonuniform heat flux conditions....
Particle suspension is considered powerful and perspective in enhancing heat transfer, but the unclear nature of particle-loaded flow limits further understanding of particle suspension. Therefore, in this paper, orthogonal experiments and the arbitrary Lagrangian-Eulerian method were used to investigate the heat transfer characteristics of particl...
In this paper, a three-dimensional axisymmetric fractal structure device was proposed for massive production of monodisperse droplets. Its channel number could increase to n m for an m-stage fractal device with n-channel distributors. A fractal device with 36 channels was constructed, and the droplet generation experiment was carried out. The exper...
Bubble-propelled Janus micromotors have attracted extensive attention in recent years and have been regarded as powerful tools in the environmental and medical fields due to their excellent movement ability. The movement ability can mainly be attributed to the periodic growth, detachment, and/or collapse of the bubble. However, subjected to the exp...
The use of double emulsions (DEs), which represent colloidal structures composed of droplets nested within droplets, can provide for unparallel droplet manipulation in droplet‐based microfluidic technology due to their unique core–shell structures. The controlled release of cores in DEs is of particular interest. However, this process remains poorl...
Supercritical carbon dioxide (S-CO 2) is one of the most promising working fluids in energy conversion systems. However, the instability of the flow and heat transfer has caused great harm to the security of energy conversion systems. In this work, a transient model based on the Finite Volume Method is set up to investigate the flow and heat transf...
Inorganic hydrated salt phase change materials (PCMs) have received great attention due to their capabilities to reduce building energy consumption and improve building thermal comfort. In this work, a modified PCM (DHPD-STP) with a low supercooling degree was first prepared by using disodium hydrogen phosphate dodecahydrate (Na2HPO4·12H2O, DHPD) a...
In promising energy conversion system of supercritical carbon dioxide (SCO 2), flow instabilities easily occur in this system when it operates near the critical pressure and pseudo-critical temperature due to drastic change of the thermal properties. The converging-diverging tube (CDT) is widely used in enhance heat transfer because of its unique a...
Microfluidic devices have great potential in cell analysis, and cell focusing/sorting is one of the basic manipulation processes required for cell analysis. This paper proposes a microchannel with a contraction–expansion structure to improve the focusing and sorting performances of particles, integrating multiple sheath fluid inputs from a single i...
Phase change microcapsule suspension is a new type of heat-storage and heat-transfer functional fluid. Due to the lack of understanding of flow-solid interaction, there was a difference in understanding the heat transfer performance of suspension fluid. Therefore, the arbitrary Lagrangian-Euler method was used to simulate the flow-solid transfer ch...
Inorganic salts are typically used phase change materials for high temperature thermal energy storage. Leakage and corrosion of phase change materials can be addressed by microencapsulation methods. However, microencapsulation of ethanol-soluble inorganic salts has not been reported. In this study, lithium nitrate (LiNO3) as a model ethanol-soluble...
Using a laser to heat microfluid has the advantages of non-contact local operation, high accuracy, and good adjustability. In this study, a focused infrared laser with a 1550-nm wavelength was applied to heat an oil–water-oil double-emulsion droplet in a microchannel. The Finite Volume Method was used to numerically study the thermocapillary flow a...
Liquid-vapor separation process is a widely used process in many industrial and domestic applications. Liquid-separation condenser using header-orifice as liquid-vapor separator has been widely studied, confirming its superiority of higher heat transfer coefficient and lower pressure drop simultaneously over the conventional condenser. However, res...
Double-emulsion droplets are usually taken as reactors in micro-fluidics for various applications, such as life science, materials synthesis, and so on, in which a good understanding of the interface behavior of core coalescence is essential but far from being well understood nowadays. In this work, the interface dynamic behavior induced by the cor...
The coalescence between the advancing liquid meniscus and multiple droplets is usually encountered in the liquid filling process and photothermal effect based microdevices. To shed light on how the coalescence between the advancing liquid meniscus and multiple droplets affects the liquid meniscus advancement, its dynamic behaviors are numerically i...
The study on cells in vitro usually encounters the signals with oscillatory or periodic temporal profiles, which requires the pulsating flow control. Aiming at this target, a novel approach to generate the pulsating waveform of fluid flow by the photothermally induced phase change in the microchannel with the sawtooth-shaped baffles was developed i...
In this work, the control of the droplet generation by a focused infrared (IR) laser with a wavelength of 1550 nm was studied, in which the liquid water and the oil with the surfactant of Span 80 were employed as the disperse and continuous phases, respectively. The characteristics of the droplet generation controlled by the laser was explored unde...
The photothermal effect of a laser can be advantageously used to manipulate the droplets coalescence, which usually encounters the coalescence between two droplets with different temperatures. In this study, the dynamic behavior of the coalescence between two droplets with different temperatures in oil is simulated using the volume of fluid (VOF) m...
The photothermal effect induced evaporation in microchannels is a typical phenomenon in optofluidics, which greatly affects the performance of this type microdevice. In this study, the dynamic flow and heat and mass transfer characteristics of a liquid column induced by an IR laser with the wavelength of 1550 nm in a microchannel is numerically stu...
In present study, a micro membrane-less photoelectrochemical cell (μML-PEC) is developed for simultaneous hydrogen and electricity productions in the presence of methanol, in which the photoanode of a TiO2 film is consisted of a compact layer at the bottom and a porous layer on the top. The experimental results indicate the PEC miniaturization, and...
In this study, a novel mesoporous CdS/TiO2[email protected]/* */ paper composite membrane was developed to enhance the visible-light responsive CO2 photoreduction in an optofluidic membrane microreactor. The microscopic morphological and pore volume characterizations indicated that the incorporation of the mesoporous SBA-15 into the membrane develo...
In this study, a membraneless, monolithic micro photocatalytic fuel cell with an air-breathing cathode was developed for simultaneous wastewater treatment and electricity generation. In this newly-developed micro photocatalytic fuel cell, the photoanode and cathode were arranged with a shoulder-to-shoulder design, forming two planar electrodes. Suc...
The photothermal effect induced phase change is an important phenomenon in optofluidics. In this work, therefore, the characteristics of the phase change in microchannels with different depths induced by a 1550 nm infrared laser under both low and high laser powers was visually studied. It was revealed that at low laser power, the liquid body could...
Smoothed particle hydrodynamics (SPH), is a meshfree, Lagrangian, particle method, which is advantageous over conventional grid-based numerical methods in the aspect of interface treatment. Therefore, it has shown promising potential for simulating the multiphase flow problems. Over the past decades, numerous efforts have been devoted to the simula...
The dynamic behavior of the moving liquid column coalescing with a sessile droplet in triangular microchannels is numerically investigated by using coupled volume of fluid with level set interface tracking method implemented in ANSYS Fluent 14.5 in conjunction with the continuum surface force model. It is found that for both hydrophobic and hydroph...
A steady-state 1D macro-homogeneous model is developed to illustrate the combustion process of methane with ozone in the reactor composed of Pd-exchanged zeolite X. The model is validated by comparing the predicted results with the measured data. The methane conversion increases with decreasing the inlet methane concentration and gas space velocity...
In this study, the dynamic behavior of the moving liquid column coalescing with a sessile droplet in a hydrophobic microchannel under pressure driven flow conditions is numerically investigated using coupled Volume of Fluid with Level Set (CLSVOF) interface tracking method implemented
in ANSYS-Fluent 14.5 in conjunction with the continuum surface f...
The dynamic behavior of the moving liquid column coalescing with a sessile droplet in a hydrophilic microchannel is simulated in this work using the volume of fluid (VOF) methodology along with the continuum surface force (CSF) model. Particular attention is paid to the dynamic interfacial phenomena during the coalescence and the effect on advancin...
