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In this Special Issue, one review paper highlights the necessity of multiscale CFD, coupling micro- and macro-scales, for exchanging information at the interface of the two scales. Four research papers investigate the hydrodynamics, heat transfer, and chemical reactions of various processes using Eulerian CFD modeling. CFD models are attractive for industrial applications. However, substantial efforts in physical modeling and numerical implementation are still required before their widespread implementation.

computational fluid dynamics (CFD) --- Eulerian continuum fluid --- volume of fluid (VOF) --- multiscale simulation --- multiphase flow --- multiphysics --- chemical and biological processes --- circulating fluidized bed riser --- computational fluid dynamics --- eulerian–eulerian --- drag models --- 2D simulation --- multi-tubular reactor --- oxidative dehydrogenation (ODH) --- reactor design --- butadiene --- multiscale modeling --- liquid plunging jet --- waste water treatment --- VOF --- void fraction --- air entrainment --- conjugate heat transfer --- open-cell foams --- structured reactors --- volumetric heat sources --- fluid properties --- STAR-CCM+ --- dynamic operation

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Modeling micrometric and nanometric suspensions remains a major issue. They help to model the mechanical, thermal, and electrical properties, among others, of the suspensions, and then of the resulting product, in a controlled way, when considered in material formation. In some cases, they can help to improve the energy transport performance. The optimal use of these products is based on an accurate prediction of the flow-induced properties of the suspensions and, consequently, of the resulting products and parts. The final properties of the resulting micro-structured fluid or solid are radically different from the simple mixing rule. In this book, we found numerous works addressing the description of these specific fluid behaviors.

Technology: general issues --- History of engineering & technology --- Materials science --- graphene nano-powder --- thermal nanofluid --- rheological behavior --- Carreau nanofluid --- lubrication effect --- Vallejo law --- liquid–liquid interface --- shear rate --- nanoparticles --- diffuse interface --- phase field method --- molecular dynamics --- numerical simulation --- octree optimization --- microstructure generation --- domain reconstruction --- flow simulation --- permeability computing --- data-driven model --- model order reduction --- proper orthogonal decomposition --- manifold learning --- diffuse approximation --- microcapsule suspension --- Hausdorff distance --- topological data analysis (TDA) --- reinforced polymers --- concentrated suspensions --- flow induced orientation --- discrete numerical simulation --- steam generator --- void fraction --- mixture model --- porous media approach --- reduced-order model --- Proper Orthogonal Decomposition (POD) --- energy dissipation --- interval-pooled stepped spillway --- omega identification method --- Navier-Stokes equation --- singularity --- transitional flow --- turbulence --- Poisson equation --- nanoparticle two-phase flow --- particle coagulation and breakage --- flow around circular cylinders --- particle distribution --- n/a --- liquid-liquid interface

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Modeling micrometric and nanometric suspensions remains a major issue. They help to model the mechanical, thermal, and electrical properties, among others, of the suspensions, and then of the resulting product, in a controlled way, when considered in material formation. In some cases, they can help to improve the energy transport performance. The optimal use of these products is based on an accurate prediction of the flow-induced properties of the suspensions and, consequently, of the resulting products and parts. The final properties of the resulting micro-structured fluid or solid are radically different from the simple mixing rule. In this book, we found numerous works addressing the description of these specific fluid behaviors.

graphene nano-powder --- thermal nanofluid --- rheological behavior --- Carreau nanofluid --- lubrication effect --- Vallejo law --- liquid–liquid interface --- shear rate --- nanoparticles --- diffuse interface --- phase field method --- molecular dynamics --- numerical simulation --- octree optimization --- microstructure generation --- domain reconstruction --- flow simulation --- permeability computing --- data-driven model --- model order reduction --- proper orthogonal decomposition --- manifold learning --- diffuse approximation --- microcapsule suspension --- Hausdorff distance --- topological data analysis (TDA) --- reinforced polymers --- concentrated suspensions --- flow induced orientation --- discrete numerical simulation --- steam generator --- void fraction --- mixture model --- porous media approach --- reduced-order model --- Proper Orthogonal Decomposition (POD) --- energy dissipation --- interval-pooled stepped spillway --- omega identification method --- Navier-Stokes equation --- singularity --- transitional flow --- turbulence --- Poisson equation --- nanoparticle two-phase flow --- particle coagulation and breakage --- flow around circular cylinders --- particle distribution --- n/a --- liquid-liquid interface

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We live in interesting times in which life as we know it is being threatened by manmade changes to the atmosphere in which we live. On the global scale, concern is focused on climate change due to greenhouse gas emissions, and on a national scale, atmospheric pollution produced by combustion processes is of concern. A possible approach is through the development of new ideas and innovative processes to the current practices. Among the available options, multi-generation processes such as the trigeneration cycle, battery storage system, solar power plants and heat pumps have been widely studied, as they potentially allow for greater efficiency, lower costs, and reduced emissions. On the other hand, some researchers had been working to increase the potential of energy generation process through heat recovery under the steam generator, organic Rankine cycle, and absorption chillers. In this Special Issue on "Thermal Systems” of fundamental or applied and numerical or experimental investigation, many new concepts in thermal systems and energy utilization were explored and published as original research papers in this “Special Issue”.

History of engineering & technology --- thermo-economic assessment --- exergy analysis --- trigeneration system --- gas microturbine --- absorption chiller --- advanced exergo-economic analysis --- waste heat recovery system --- ORC --- endogenous exergy --- exogenous exergy --- thermal management --- Li-ion battery --- heat pipe --- thermoelectric cooler --- oscillating heat pipes --- heat transfer --- milling cooling --- abrasive-milling processes --- solar network --- dynamic modelling --- plug flow --- control --- supercritical carbon dioxide --- experimental testing --- finned-tube gas cooler --- energy poverty --- centralised heat pump --- hourly heating demand --- off-design heat pump model --- alternative process --- non-coating method --- room-temperature swaging --- pseudo-single tube (PST) --- accident-tolerant fuel (ATF) cladding --- minichannel flow boiling --- void fraction --- inverse heat transfer problem --- Trefftz method --- vortex generator --- vortex tube --- temperature separation --- the low-temperature air flow ratio (yc), inlet pressure (Pi)

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This book, entitled “The Green Energy Technology”, covers technologies, products, equipment, and devices, as well as energy services, based on software and data protected by patents and/or trademarks. The recent trends underline the principles of a circular economy such as sustainable product design, extending the product’s lifecycle, reusability, and recycling. These are highly related to climate change and environmental impact, and limited natural resources require scientific research and novel technical solutions. This book will serve as a collection of the latest scientific and technological approaches to “green”—i.e., environmentally friendly and sustainable—technologies. While the focus is on energy and bioenergy, it also covers "green" solutions in all aspects of industrial engineering. Green Energy Technology addresses researchers, advanced students, technical consultants and decision-makers in industries and politics. This book is a comprehensive overview and in-depth technical research paper addressing recent progress in Green Energy Technology. We hope that readers will enjoy reading this book.

Technology: general issues --- esterification --- biodiesel --- noncatalytic reaction --- kinetic --- microwave irradiation --- bioenergy --- energy saving --- daylight --- heat flux reduction --- illumination --- CIE standard --- deep dynamic stall --- passive vortex generators --- wind turbine airfoil --- URANS simulations --- socio-technical transition --- strateg0ic niche management --- clean energy technologies --- argumentative discourse analysis --- innovation policy --- regional electricity market --- energy security --- energy efficiency --- energy sustainability --- ASEAN --- electricity liberalisation --- electricity unbundling --- TRACE --- MARS-KS --- PSBT --- void fraction --- crossflow --- circulating fluidized bed --- adsorption --- activated carbon --- phenol --- glass beads --- green supply chain --- value co-creation --- firm performance --- waste plastic oil (WPO) --- engine performance --- renewable gasoline --- pyrolysis --- Energy hybridization --- hydropower --- wind energy --- solar energy --- rural areas --- 100% Renewable grid --- energy harvesting --- electromagnetic generator --- energy floor tile --- power management system --- footstep energy harvesting --- piezoelectric --- energy harvesting paver --- hydrogen blending --- natural gas networks --- power-to-hydrogen --- hydrogen and compressed natural gas --- renewable energy --- hydrogen strategy --- water --- floatovoltaic --- photovoltaic --- energy water nexus --- dual use --- water conservation --- FPV --- floating photovoltaic --- wave energy converter --- hydraulic power take-off unit --- parameter estimation --- genetic algorithm --- non-linear programming by quadratic Lagrangian --- light pipe --- light transmission --- daylight factor --- small-scale --- success factor --- community renewable energy --- sustainable energy --- print circuit heat exchanger --- PCHE --- efficiency --- nusselt number --- heat transfer coefficient --- NTU value --- thermal performance --- n/a