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The miniaturization of components in mechanical and electronic equipment has been the driving force for the fast development of micro/nanosystems. Heat and mass transfer are crucial processes in such systems, and they have attracted great interest in recent years. Tremendous effort, in terms of theoretical analyses, experimental measurements, numerical simulation, and practical applications, has been devoted to improve our understanding of complex heat and mass transfer processes and behaviors in such micro/nanosystems. This Special Issue is dedicated to showcasing recent advances in heat and mass transfer in micro- and nanosystems, with particular focus on the development of new models and theories, the employment of new experimental techniques, the adoption of new computational methods, and the design of novel micro/nanodevices. Thirteen articles have been published after peer-review evaluations, and these articles cover a wide spectrum of active research in the frontiers of micro/nanosystems.

Darcy-Forchheimer theory --- nonlinear stretching --- nanofluid --- magnetohydrodynamics --- convective conditions --- carbon nanotubes --- thermal radiation --- porous cavity --- wavy channels --- nanofluids --- forced convection --- heat enhancement --- pressure drop --- mesh model --- microfluidic --- flow distributions --- fluid network --- microchannel --- heat transfer enhancement --- numerical simulation --- monodisperse droplet generation --- satellite droplets --- piezoelectric method --- droplet coalescence --- lattice Boltzmann method --- inertial migration --- Poiseuille flow --- pulsatile velocity --- loop heat pipe --- deionized water --- two-phase flow --- visualization --- heat transfer experiment --- heat transfer --- porous media --- pore-scale modeling --- boundary condition --- thermal conductivity --- porosity --- conjugate interface --- aspect ratio --- Maxwell nanofluid --- Darcy–Forchheimer model --- chemical reaction --- Brownian diffusion --- wearable device --- microfluidic chip --- sweat collecting --- microfluidics --- liquid metal --- measurement --- temperature monitoring --- PCR --- pin-fins --- wavy pin-fins channel --- performance criterion --- friction factor --- n/a --- Darcy-Forchheimer model

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Fluid interfaces are promising candidates for confining different types of materials - e.g., polymers, surfactants, colloids, and even small molecules - and for designing new functional materials with reduced dimensionality. The development of such materials requires a deepening of the Physico-chemical bases underlying the formation of layers at fluid interfaces, as well as on the characterization of their structures and properties. This is of particular importance because the constraints associated with the assembly of materials at the interface lead to the emergence of equilibrium and dynamics features in the interfacial systems, which are far from those conventionally found in the traditional materials. This Special Issue is devoted to studies on fundamental and applied aspects of fluid interfaces, trying to provide a comprehensive perspective on the current status of the research field.

thermal radiations --- magnetic field --- Carreau fluid --- stretching/shrinking surface --- Hall effect --- nonlinear radiations --- HAM --- desulfurization wastewater evaporation technology --- evaporation performance --- orthogonal test --- simulation --- spray coating --- coating film formation --- leveling of coating surface --- fluorescence method --- visualization --- ferromagnetic --- nanofluid --- bioconvection --- porous medium --- heat suction/injection --- magnetic dipole --- liquid-infused surfaces --- durability --- lubricants --- wetting --- liquid-repellent coatings --- annealed Co40Fe40W20 thin films --- magnetic tunnel junctions (MTJs) --- X-ray diffraction (XRD) --- contact angle --- surface energy --- nanomechanical properties --- Prandtl nanofluid flow --- convectively heated surface --- stochastic intelligent technique --- Levenberg Marquardt method --- backpropagated network --- artificial neural network --- Adam numerical solver --- surface hydrophilicity --- graphene --- ice formation --- clearance --- molecular dynamic simulation --- dynamics --- fluid interfaces --- inhalation --- lung surfactant --- nanoparticles --- pollutants --- rheology --- emulsion --- droplet size --- microscopy-assisted --- image analysis --- laser diffraction --- turbidity --- viscosity --- Ree-Eyring nanofluid --- viscous dissipation --- Cattaneo-Christov model --- Koo-Kleinstreuer model --- chemical reaction --- heat transfer --- stretching cylinder --- nonlinear radiation --- Powell–Eyring --- Darcy–Forchheimer --- n/a --- Powell-Eyring --- Darcy-Forchheimer

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“Computational Mathematics, Algorithms, and Data Processing” of MDPI consists of articles on new mathematical tools and numerical methods for computational problems. Topics covered include: numerical stability, interpolation, approximation, complexity, numerical linear algebra, differential equations (ordinary, partial), optimization, integral equations, systems of nonlinear equations, compression or distillation, and active learning.

Research & information: general --- Mathematics & science --- interpolation --- constraints --- embedded constraints --- generalized multiscale finite element method --- multiscale model reduction --- deep learning --- Deep Neural Nets --- ReLU Networks --- Approximation Theory --- radial basis functions --- native spaces --- truncated function --- approximation --- surface modeling --- second order initial value problems --- linear multistep methods --- Obrechkoff schemes --- trigonometrically fitted --- Darcy-Forchheimer model --- flow in porous media --- nonlinear equation --- heterogeneous media --- finite element method --- multiscale method --- mixed generalized multiscale finite element method --- multiscale basis functions --- two-dimensional domain --- Thiele-like rational interpolation continued fractions with parameters --- unattainable point --- inverse difference --- virtual point --- polynomial chaos --- Szegő polynomials --- directional statistics --- Rogers-Szegő --- state estimation --- clustering

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“Computational Mathematics, Algorithms, and Data Processing” of MDPI consists of articles on new mathematical tools and numerical methods for computational problems. Topics covered include: numerical stability, interpolation, approximation, complexity, numerical linear algebra, differential equations (ordinary, partial), optimization, integral equations, systems of nonlinear equations, compression or distillation, and active learning.

Research & information: general --- Mathematics & science --- interpolation --- constraints --- embedded constraints --- generalized multiscale finite element method --- multiscale model reduction --- deep learning --- Deep Neural Nets --- ReLU Networks --- Approximation Theory --- radial basis functions --- native spaces --- truncated function --- approximation --- surface modeling --- second order initial value problems --- linear multistep methods --- Obrechkoff schemes --- trigonometrically fitted --- Darcy-Forchheimer model --- flow in porous media --- nonlinear equation --- heterogeneous media --- finite element method --- multiscale method --- mixed generalized multiscale finite element method --- multiscale basis functions --- two-dimensional domain --- Thiele-like rational interpolation continued fractions with parameters --- unattainable point --- inverse difference --- virtual point --- polynomial chaos --- Szegő polynomials --- directional statistics --- Rogers-Szegő --- state estimation --- clustering

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Over the past four decades, there has been increased attention given to the research of fluid mechanics due to its wide application in industry and phycology. Major advances in the modeling of key topics such Newtonian and non-Newtonian fluids and thin film flows have been made and finally published in the Special Issue of coatings. This is an attempt to edit the Special Issue into a book. Although this book is not a formal textbook, it will definitely be useful for university teachers, research students, industrial researchers and in overcoming the difficulties occurring in the said topic, while dealing with the nonlinear governing equations. For such types of equations, it is often more difficult to find an analytical solution or even a numerical one. This book has successfully handled this challenging job with the latest techniques. In addition, the findings of the simulation are logically realistic and meet the standard of sufficient scientific value.

Technology: general issues --- Synovial fluid --- coating --- shear-thinning and -thickening models --- mass transport --- asymmetric channel --- analytical solution --- thin film --- spin coating --- rotating disk --- nanoparticles --- Newtonian fluids --- coatings --- curved stretched surface --- nanoliquid --- nonlinear thermal radiation --- entropy generation --- Reiner-Phillipoff fluid --- time-dependent --- thermal radiation --- homotopy analysis method (HAM) --- thin film of micropolar fluid --- porous medium --- thermophoresis --- skin friction --- Nusselt number and Sherwood number --- variable thickness of the liquid film --- HAM --- optical fiber coating --- double-layer coating --- viscoelastic PTT fluid --- analytic and numerical simulations --- thin film casson nanofluid --- SWCNTs and MWCNTs --- stretching cylinder --- MHD --- unsteady flow and heat transfer --- nanofluid --- Blasius–Rayleigh–Stokes variable --- dual solutions --- numerical solution --- correlation expressions --- Casson fluid --- condensation film --- heat generation/consumption --- thin liquid film flow --- carbon nanotubes --- Cattaneo-Christov heat flux --- variable heat source/sink --- heated bi-phase flow --- couple stress fluid --- lubrication effects --- slippery walls --- magnetohydrodynamics --- Darcy-Forchheimer nanofluid --- nonlinear extending disc --- variable thin layer --- HAM and numerical method --- peristaltic flow --- an endoscope --- variable viscosity --- Adomian solutions --- different wave forms --- pseudo-similarity variable --- micropolar nanofluid --- darcy forchheimer model --- MHD flow --- triple solution --- stability analysis --- APCM --- Caputo derivative --- unsteady flow --- shrinking surface --- Williamson model --- peristaltic pumping --- convective boundary conditions --- analytic solutions --- second order slip --- double stratification --- Cattaneo–Christov heat flux --- variable thermal conductivity --- Williamson nanofluid --- velocity second slip --- wave forms --- exact solutions --- magnetic field --- heat and mass transfer --- Hall current --- homogeneous–heterogeneous reactions --- viscoelastic fluids --- heterogeneous–homogeneous reactions --- mixed convective flow --- binary chemical reaction --- arrhenius activation energy --- gas-liquid coatings --- bubbles --- two-fluid model --- phase distribution --- HPM --- double diffusion --- curved channel --- compliant walls --- analytical solutions --- third grade fluid model --- hybrid nanofluid --- induced magnetic field --- mixed convection --- heat generation --- peristalsis --- cilia beating --- Non-Newtonian --- Bejan number --- Jeffrey fluid model --- eccentric annuli --- droplet impact modelling --- impedance analysis --- rain erosion --- ultrasound measurements --- viscoelastic modelling --- wind turbine blades --- computational modelling --- rain erosion testing --- viscoelastic characterization --- development and characterization of coatings --- applications of thin films --- nanostructured materials --- surfaces and interfaces --- applications of multiphase fluids --- mathematical modeling on biological applications --- electronics --- magnetics and magneto-optics