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Geometrical effect coupled with nanofluid on heat transfer enhancement in heat exchangers

International Journal of Thermofluids 2021年 10卷

作者： Olabi, A.G. Wilberforce, Tabbi Sayed, Enas Taha Elsaid, Khaled Rahman, S.M.Atiqure Abdelkareem, Mohammad Ali Department of Sustainable and Renewable Energy Engineering University of Sharjah P.O. Box 27272 Sharjah United Arab Emirates Mechanical Engineering and Design Aston University School of Engineering and Applied Science Aston Triangle BirminghamB4 7ET United Kingdom Center for Advanced Materials Research University of Sharjah PO Box 27272 Sharjah United Arab Emirates Chemical Engineering Department Minia University Elminia Egypt Chemical Engineering Program Texas A& M University College StationTX United States

This investigation summarized the application of nanofluids (NFs) in heat exchangers (HExs) with different geometries. The quest for heat devices with quick response for the industrial sector is still a major challenge that has been an active research direction over the years. Addressing this issue is likely to increase the capacity of several industries. There is a direct relationship between expanding the heat capacity and the pressure drop. The common approach in increasing the rate of heat transfer often leads to an increment in pressure drop. This study reviews and summarizes the investigations on various geometrical effects inside the channel combined with NF in HExs. This review explored the potential of NFs as possible heat transfer fluid in HExs. From a detailed literature review compiled and evaluated, it has been deduced that NFs application significantly improves the thermal efficiency of HExs. The investigation further evaluated plate, helical, as well as shell and tube HExs. The review explored NFs application in HExs and how they can significantly improve the HExs' thermal characteristics. It was deduced that the use of NFs improved the heat transfer both experimentally and numerically. This equally has a direct relation to energy savings as well as industrial waste heat. © 2021 The Author(s)

关键词： Heat exchangers

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Implementing Reactivity in Molecular Dynamics Simulations with Harmonic Force Fields

arXiv

引用

arXiv 2021年

作者： Winetrout, Jordan J. Kanhaiya, Krishan Kemppainen, Joshua in‘t Veld, Pieter J. Sachdeva, Geeta Pandey, Ravindra Damirchi, Behzad van Duin, Adri Odegard, Gregory M. Heinz, Hendrik Department of Chemical and Biological Engineering University of Colorado at Boulder BoulderCO80309 United States Materials Science and Engineering Program University of Colorado at Boulder BoulderCO80309 United States Insitute of Physics Ruhr University Bochum Universitätstrasse 150 Bochum44801 Germany Department of Mechanical Engineering - Engineering Mechanics Michigan Technological University HoughtonMI49931 United States BASF SE Ludwigshafen67056 Germany Department of Physics Michigan Technological University HoughtonMI49931 United States Department of Mechanical Engineering Pennsylvania State University University ParkPA16802 United States

The simulation of chemical reactions and mechanical properties including failure from atoms to the micrometer scale remains a longstanding challenge in chemistry and materials science. Bottlenecks include computational feasibility, reliability, and cost. We introduce a method for reactive molecular dynamics simulations using a clean replacement of non-reactive classical harmonic bond potentials with reactive, energy-conserving Morse potentials, called the Reactive INTERFACE Force Field (IFF-R). IFF-R is compatible with force fields for organic and inorganic compounds such as IFF, CHARMM, PCFF, OPLS-AA, and AMBER. Bond dissociation is enabled by three interpretable Morse parameters per bond type and zero energy upon disconnect. Use cases for bond breaking in molecules, failure of polymers, carbon nanostructures, proteins, composite materials, and metals are shown. The simulation of bond forming reactions was included via template-based methods. IFF-R maintains the accuracy of the corresponding nonreactive force fields and is about 30 times faster than prior reactive simulation methods. © 2021, CC BY-NC-ND.

关键词： Molecular dynamics

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Sensing fugitive hydrogen emissions

Nature Reviews Electrical Engineering

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Nature Reviews Electrical engineering 2024年第4期1卷 210-211页

作者： Yichen Cai Kuo-Wei Huang Sudipta Chatterjee Khaled N. Salama Lain-Jong Li Chemistry Program Division of Physical Sciences and Engineering and KAUST Catalysis Center King Abdullah University of Science and Technology Thuwal Saudi Arabia Agency for Science Technology and Research Institute of Materials Research and Engineering and Institute of Sustainability for Chemicals Energy and Environment Singapore Singapore Department of Chemistry Birla Institute of Technology and Science − Pilani K.K. Birla Goa Campus Zuarinagar India Advanced Membranes and Porous Materials Center and Division of Computer Electrical and Mathematical Science and Engineering King Abdullah University of Science and Technology Thuwal Saudi Arabia Department of Mechanical Engineering University of Hong Kong Hong Kong P. R. China

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high-entropy silicide:(Mo_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)W_(0.2))Si_(2)

引用

Journal of Materiomics 2019年第3期5卷 337-343页

作者： Joshua Gild Jeffrey Braun Kevin Kaufmann Eduardo Marin Tyler Harrington Patrick Hopkins Kenneth Vecchio Jian Luo Program of Materials Science and Engineering University of CaliforniaSan DiegoLa JollaCA92093-0418USA Department of Mechanical and Aerospace Engineering University of VirginiaCharlottesvilleVA22904USA Department of NanoEngineering University of CaliforniaSan DiegoLa JollaCA92093-0448USA

A high-entropy metal disilicide,(Mo_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)W_(0.2))Si_(2),has been successfully synthesized.X-ray diffraction(XRD),energy dispersive X-ray spectroscopy(EDX),and electron backscatter diffraction(EBSD)collectively show the formation of a single high-entropy silicide *** high-entropy(Mo_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)W_(0.2))Si_(2) possesses a hexagonal C40 crystal structure with ABC stacking sequence and a space group of *** discovery expands the known families of high-entropy materials from metals,oxides,borides,carbides,and nitrides to a silicide,for the first time to our knowledge,as well as demonstrating that a new,non-cubic,crystal structure(with lower symmetry)can be made into highentropy ***(Mo_(0.2)Nb_(0.2)Ta_(0.2)Ti_(0.2)W_(0.2))Si_(2) exhibits high nanohardness of 16.7±1.9 GPa and Vickers hardness of 11.6±0.5 ***,it has a low thermal conductivity of 6.9±1.1Wm^(-1) K^(-1),which is approximately one order of magnitude lower than that of the widely-used tetragonal MoSi_(2) and ~1/3 of those reported values for the hexagonal NbSi_(2) and TaSi_(2) with the same crystal structure.

关键词： High-entropy ceramics High-entropy silicide Thermal conductivity Hardness C40 crystal structure

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Core packing of well-defined x-ray and NMR structures is the same

arXiv

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arXiv 2022年

作者： Grigas, Alex T. Liu, Zhuoyi Regan, Lynne O’Hern, Corey S. Graduate Program in Computational Biology and Bioinformatics Yale University New HavenCT06520 United States Integrated Graduate Program in Physical and Engineering Biology Yale University New HavenCT06520 United States Department of Mechanical Engineering and Materials Science Yale University New HavenCT06520 United States Institute of Quantitative Biology Biochemistry and Biotechnology Centre for Synthetic and Systems Biology School of Biological Sciences University of Edinburgh United Kingdom Department of Physics Yale University New HavenCT06520 United States Department of Applied Physics Yale University New HavenCT06520 United States

Numerous studies have investigated the differences and similarities between protein structures determined by solution NMR spectroscopy and those determined by x-ray crystallography. A fundamental question is whether any observed differences are due to differing methodologies, or to differences in the behavior of proteins in solution versus in the crystalline state. Here, we compare the properties of the hydrophobic cores of high-resolution protein crystal structures and those in NMR structures, determined using increasing numbers and types of restraints. Prior studies have reported that many NMR structures have denser cores compared to those of high-resolution x-ray crystal structures. Our current work investigates this result in more detail, and finds that these NMR structures tend to violate basic features of protein stereochemistry, such as small non-bonded atomic overlaps and few Ramachandran and side chain dihedral angle outliers. We find that NMR structures solved with more restraints, and which do not significantly violate stereochemistry, have hydrophobic cores that have a similar size and packing fraction as their counterparts determined by x-ray crystallography at high-resolution. These results lead us to conclude that, at least regarding the core packing properties, high-quality structures determined by NMR and x-ray crystallography are the same, and the differences reported earlier are most likely a consequence of methodology, rather than fundamental differences between the protein in the two different environments. Significance: Dense packing of hydrophobic residues is key to protein structure and stability. Previously, it has been noted that structures solved by NMR spectroscopy have denser cores than x-ray crystal structures. Here, we calculate the core size and packing fraction of NMR structures with experimental restraints in the PDB. Their cores are typically smaller, but denser. However, NMR structures with accurate stereochemistry possess core pa

关键词： X ray crystallography

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Nanomanipulation of Colloidal Particles via Optothermallygated Photon Nudging

Nanomanipulation of Colloidal Particles via Optothermallygat...

引用

Novel Optical materials and Applications, NOMA 2019

作者： Li, Jingang Liu, Yaoran Zheng, Yuebing Materials Science and Engineering Program and Texas Materials Institute University of Texas at Austin AustinTX78712 United States Department of Mechanical Engineering University of Texas at Austin AustinTX78712 United States

We report an all-optical technique for versatile nanomanipulation and assembly of various colloidal particles on a solid substrate by harnessing both photothermal effects and optical scattering forces. © 2019 The... 详细信息

ISBN: (纸本)9781943580644

关键词： Micromanipulators

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Universal mechanical response of metallic glasses during strain-rate-dependent uniaxial compression

arXiv

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arXiv 2022年

作者： Jin, Weiwei Datye, Amit Schwarz, Udo D. Shattuck, Mark D. O'Hern, Corey S. Department of Mechanical Engineering and Materials Science Yale University New HavenCT06520 United States Department of Chemical and Environmental Engineering Yale University New HavenCT06520 United States Benjamin Levich Institute Physics Department The City College of New York New YorkNY10031 United States Department of Physics Yale University New HavenCT06520 United States Department of Applied Physics Yale University New HavenCT06520 United States Graduate Program in Computational Biology and Bioinformatics Yale University New HavenCT06520 United States

Experimental data on the compressive strength σmax versus strain rate Ε eng for metallic glasses undergoing uniaxial compression shows significantly different behavior for different alloys. For some metallic glasses, σmax decreases with increasing Ε eng, for others, σmax increases with increasing Ε eng, and for others σmax versus Ε eng is nonmonotonic. Using numerical simulations of metallic glasses undergoing uniaxial compression at nonzero strain rate and temperature, we show that they obey a universal relation for the compressive strength versus temperature, which determines their mechanical response. At low Ε eng, increasing strain rate leads to increases in temperature and decreases in σmax∗, whereas at high Ε eng, increasing strain rate leads to decreases in temperature and increases in σmax∗. This non-monotonic behavior of σmax∗ versus temperature causes the nonmonotonic behavior of σmax∗ versus Ε eng. Variations in the internal dissipation change the characteristic strain rate at which the nonmonotonic behavior occurs. These results are general for a wide range of metallic glasses with different atomic interactions, damping coefficients, and chemical compositions. © 2022, CC BY.

关键词： Strain rate

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Manipulating Fano coupling in all-dielectric meta-molecules

Manipulating Fano coupling in all-dielectric meta-molecules

引用

Novel Optical materials and Applications, NOMA 2019

作者： Lin, Linhan Peng, Xiaolei Zheng, Yuebing Department of Mechanical Engineering University of Texas at Austin AustinTX78712 United States Materials Science and Engineering Program and Texas Materials Institute University of Texas at Austin AustinTX78712 United States

ISBN: (纸本)9781943580644

关键词： Beam scattering Electron beam lithography Fano resonance Laser beams Mie resonances Optical switching devices

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Bridging particle deformability and collective response in soft solids

引用

Physical Review materials 2021年第5期5卷 055605-055605页

作者： John D. Treado Dong Wang Arman Boromand Michael P. Murrell Mark D. Shattuck Corey S. O'Hern Department of Mechanical Engineering & Materials Science Yale University New Haven Connecticut 06520 USA Integrated Graduate Program in Physical and Engineering Biology Yale University New Haven Connecticut 06520 USA Department of Biomedical Engineering Yale University New Haven Connecticut 06520 USA Department of Physics Yale University New Haven Connecticut 06520 USA Systems Biology Institute Yale University West Haven Connecticut 06516 USA Benjamin Levich Institute and Physics Department The City College of New York New York New York 10031 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA

Soft, amorphous solids such as tissues, foams, and emulsions are composed of deformable particles. However, the effect of single-particle deformability on the collective behavior of soft solids is still poorly understood. We perform numerical simulations of two-dimensional jammed packings of explicitly deformable particles to study the mechanical response of model soft solids. We find that jammed packings of deformable particles with excess shape degrees of freedom possess low-frequency quartic vibrational modes that stabilize the packings even though they possess fewer interparticle contacts than the nominal isostatic value. Adding intraparticle constraints can rigidify the particles, but these particles undergo a buckling transition and gain an effective shape degree of freedom when their preferred perimeter is above a threshold value. We find that the mechanical response of jammed packings of deformable particles with shape degrees of freedom differs significantly from that of jammed packings of rigid-shape particles, which emphasizes the importance of particle deformability in modeling soft solids.

关键词： Collective behavior Jamming Emulsions Foams Tissues Molecular dynamics

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Effects of oxygen availability on Nb-Si multilayer processed by plasma transferred arc

Effects of oxygen availability on Nb-Si multilayer processed...

引用

materials science and Technology 2019, MS and T 2019

作者： Cardozo, Eloisa Pereira D'Oliveira, Ana Sofia C.M. Post Graduation Program on Materials Science and Engineering Universidade Federal do Paraná Curitiba Paraná Brazil Department of Mechanical Engineering Universidade Federal do Paraná Curitiba Paraná Brazil

ISBN: (纸本)0873397703

The need for higher propulsive and thermal efficiency in high temperature equipment has induced the search for materials that can withstand such harsh operating conditions. Within this group, the Nb-Si alloy system offers an attractive set of properties although they still present a challenge regarding the effects of oxygen. To address the role of processing environment on microstructure and oxidation performance of a Nb-Si multilayer, a powder mixture (Nb37wt%Si) were deposited under an argon atmosphere and in air. NbSi2 and Nb5Si3 were identified in multilayers processed with Nb37wt%Si mixture. The argon atmosphere accounts for changes in phase morphology and also for the enhanced oxidation resistance. This behavior can be accounted for by the high solubility of oxygen on silicides, that contributes to entrap oxygen in multilayers processed in air compromising oxidation performance. © 2019 MS&T19®

关键词： 3D printers

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