Modeling of Micro/Nano Channel Flows

Abstract

This paper reviews the models for the fluid flow in micro/nano channels developed previously. These models include the full MDS (molecular dynamics simulation) model, the quasi-continuum model, the modified Navier-Stokes equation model, the dissipative particle dynamics method, the lattice Boltzman method, the multiscale hybrid model and the flow factor approach model. It was pointed out that most of the models have their own imperfections like huge time and computer storage consumption for simulating a system of realistic size or inaccuracy because of the model limitation. It was also mentioned that the most challenging is to develop efficient models for simulating engineering flows which often occur in much longer channels than currently simulated on a computer. These welcome models should be sufficiently accurate with fast calculation and acceptable computer storage consumption.

Study of one-dimensional of W/SiO2 grating selective thermal emitter for thermophotovoltaic applications

“…The grating period is Λ= 600 nm, the thickness of tungsten grating or silver lattice is h = 30 nm, the filling ratio ƒ = 0.40, the thickness of SiO2 spacer d1 = 100 nm and the thickness of shallow tungsten layer d2 = 40 nm. However to simulate the selective emitter explored here, Helmholtz's equation is solved by using the RCWA method [43][44][45] in order to find the reflectance (R). The absorptance (α) is calculated indirectly by energy conservation using α = 1 − R. Finally, the emittance is obtained through Kirchhoff's law, which states that in thermal equilibrium the absorptance is equal to the emittance (α = ε) [43].…”

Analytical Solution of the Extended Graetz Problem in Microchannels and Microtubes With Fixed Pressure Drop

“…The miniaturization of industrial products is continuously evolving due to the technological development in many industrial fields. The everincreasing miniaturization raises several challenges in which cooling plays an important role, such as in the development of micro-heatexchangers (Chung et al, 2011;Khan and Fartaj, 2011;Han et al, 2012;Ismail et al, 2012;Kanor and Manimaran, 2016;Zhang, 2017;Qasem and Zubair, 2018;Zarita and Hachemi, 2019;Ramesh et al, 2021;Soheel et al, 2021;Turkyilmazoglu, 2021b;Gao et al, 2022;Gulia and Sur, 2022;Al-Gburi et al, 2023;Jaddoa et al, 2023). Therefore, understanding the physics of heat transfer and fluid flow at the microscale level has a significant role in this industrial trend.…”