Kyushu University · Engineering
Professor Zhenying Wang's research lab specializes in the fundamental mechanisms of multiphase flows and interfacial phenomena in evaporating and spreading droplets, with a focus on multicomponent and volatile liquid systems. The lab investigates the complex interplay between capillary flow, evaporation-induced Marangoni convection, thermal gradients, and non-equilibrium heat and mass transfer at the three-phase contact line. Their work combines advanced mathematical modeling, infrared thermography, and experimental validation to uncover the underlying physics in applications ranging from liquid desiccant dehumidification to microfluidics and thermal management.
Figures are computed from collected data and may differ slightly.
Wetting and evaporation of sessile droplets are ubiquitous in nature and of importance to many industrial and everyday processes. While most of the research on sessile droplets has been constraint to single component droplets, complex multicomponent droplets are in fact the most common systems in natural and industrial fields. Multicomponent droplets show diverse behaviors as the concentration of the different components varies in both the liquid and the gas phases. The nonuniform distribution o
Abstract
Flow structure near three phase contact line (TPCL) of evaporating liquids plays a significant role in liquid wetting and dewetting, liquid film evaporation, and boiling. Despite the wide focus it receives, the interacting mechanisms therein remain elusive and in specific cases, controversial. Here, we reveal the profile of internal flow and elucidate the dominating mechanisms near TPCL of evaporating droplets, using mathematical modeling, trajectory analysis, and infrared thermography. We indic
In all kinds of liquid desiccant dehumidification systems, the temperature increase of the desiccant solution due to the effect of absorptive heating is one of the main reasons of performance deterioration. In this study, we look into the thermal effects during vapor absorption into single hygroscopic liquid desiccant droplets. Specifically, the effect of substrate conductivity on the transient heat and mass transfer process is analyzed in detail. The relative strength of the thermal effect and
Droplet spreading is ubiquitous and plays a significant role in liquid-based energy systems, thermal management devices and microfluidics. While the spreading of non-volatile droplets is quantitatively understood, the spreading and flow transition in volatile droplets remains elusive due to the complexity added by interfacial phase change and non-equilibrium thermal transport. Here we show, using both mathematical modelling and experiments, that the wetting dynamics of volatile droplets can be s
Non-uniform distribution of interfacial mass flux across an evaporating droplet will subsequently induce a temperature gradient across the liquid-air interface, and result in thermal Marangoni stress that reforms the flow field inside the droplet. Recent study (Shiri, et al. Phys. Rev. Lett. 2021, Yang, et al. Langmuir 2022) confirmed the role of thermal Marangoni effect on the shape of evaporating single component droplets on completely wetting substrates. Nevertheless, a comprehensive evaluati
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