In this paper, visual experiments were carried out to study the NaCl crystallization process in acoustically levitated droplets. Image processing was employed to acquire the evaporation rate of the droplets and PIV analysis was used to characterize the flow filed. Effects of droplet size and initial NaCl concentration were investigated, and the crystallization behaviors in the levitated droplet and surface droplet were compared. The results indicate that the acoustic filed introduced a forced convection of fluid within the levitated droplets, influencing the evaporation rate, supersaturation degree and the morphology of the crystal product. The obtained mechanism is important to the application of acoustically levitated droplet and can be further applied to other crystallization research based on the acoustic levitation systems.
In this study, a novel coupling strategy of visible-light photocatalytic hollow optical fiber and graphite carbon nitride matrix composite was proposed to enhance the performance of photocatalytic reduction of CO2 and the efficiency of light energy utilization. The composite material (TMOF/CNNS) composed of TMOF-10-NH2 (TMOF) and g-C3N4 (CNNS) has an enhanced charge separation efficiency. The synthesized TMOF/CNNS photocatalyst was coated on the surface of the optical fiber. The photocatalytic activity of the prepared photocatalytic hollow optical fiber for the gas-phase reduction of CO2 was evaluated in the wavelength range of 380-780 nm. Compared with the photocatalytic reduction of CO2 in the gas phase with CNNS-coated hollow quartz fiber and CNNS-coated filter paper, the TMOF/CNNS-coated hollow quartz fiber significantly improved the CO2 yield and selectivity of CO.
KEYWORDS: Fiber Bragg gratings, Porosity, 3D metrology, Temperature metrology, Solar energy, Sensors, Receivers, Temperature distribution, Reflection, Detector arrays
This study introduces a novel method for in-situ temperature measurement within photothermal porous materials for solar-driven interfacial evaporation. By embedding fiber Bragg gratings (FBGs) sensor arrays into the solar receiver constructed via a PDMS-CNPs sponge, 3D temperature distribution within the porous structure was reconstructed. Effects of the input light intensity and different working modes on the dynamic temperature response and the heat transfer characteristics were investigated. The results reveal that a thermal equilibrium could be quickly established within the photothermal porous material, and the heat loss to the bulk fluid could be significantly reduced by heat insulation configurations. The results highlight the effectiveness of the proposed method in in-situ temperature field monitoring for photothermal porous materials, which can be further applied in solar receiver construction and optimization of the solar evaporator for solar-driven interfacial applications.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.