Would you live in a place built from life-sized Lego bricks?In South Florida[is]a first-of-its-kind apartment project using innovative new building blocks designed to be assembled much like a giant toy kit.The Miami company behind the blocks says they’re built to last and have been tested to withstand Category 5 hurricane winds.
The behavior of single-phase flow and conjugate heat transfer in micro-channel heat sinks(MCHS)subjected to auniform heat flux is investigated by means of numerical simulations.Various geometrical configurations areexamined,particularly,the combinations of rectangular solid and perforated blocks,used to create a disturbancein the flow.The analysis focuses on several key aspects and related metrics,including the temperature distribution,the mean Fanning friction factor,the pressure drop,the Nusselt number,and the overall heat transfer coefficientacross a range of Reynolds numbers(80–870).It is shown that the introduction of such blocks significantlyenhances the heat transfer performances of the MCHS compared to the straight-through flow channel.Specifically,a case is found where the Nusselt number increases by 2.3 times relative to the reference case.The integrationof perforated blocks facilitates the generation of vorticity within the channel,promoting the mixing of coldand hot fluids.Notably,MCHS incorporating perforated rectangular blocks exhibit more pronounced heat transferbenefits at Reynolds numbers smaller than 400.
In this study,to achieve convenient and sensitive detection of the concentration of the black liquor solution,we constructed two-dimensional photonic crystal sensors with a periodic arrangement of elliptical and circular pores in a hexagonal lattice.The photonic bandgap in transverse magnetic(TM)mode was analyzed using the plane wave expansion method.This was followed by simulations to obtain absorption spectra at different concentrations of black liquor,with subsequent processing and computation.The simulation results revealed a linear correlation between the concentration of black liquor and the position of the trough in the absorption spectrum under consistent temperature conditions.Notably,as the concentration of black liquor solution increased,the position of absorption spectra trough shifted towards the low-frequency region.Through parameters optimization,we achieved a relationship equation with a linear fitting coefficient R^(2)of 1.000.The sensitivity of the two-dimensional photonic crystal sensor composed of circular scatters with line defects in the hexagonal lattice can be as high as 508.3 nm/RIU when the mass fraction of black liquor solution ranges from 10 to 20%.These results provide an essential theoretical basis for applying photonic crystal sensors to detect black liquor concentrations.This study holds promise for the design and fabrication of high-performance photonic crystal sensors for practical applications.
Jiajia QuanYu SongHuiyu LiFangyuan ZhaoLin ZhouZhongyu CaiYong Wan
