Information Preservation Methods for Modeling Micro-scale Gas Flows

Information Preservation Methods for Modeling Micro-scale Gas Flows PDF Author: Quanhua Sun
Publisher:
ISBN:
Category :
Languages : en
Pages : 350

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Information Preservation Methods for Modeling Micro-scale Gas Flows

Information Preservation Methods for Modeling Micro-scale Gas Flows PDF Author: Quanhua Sun
Publisher:
ISBN:
Category :
Languages : en
Pages : 350

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Book Description


Direct Modeling For Computational Fluid Dynamics: Construction And Application Of Unified Gas-kinetic Schemes

Direct Modeling For Computational Fluid Dynamics: Construction And Application Of Unified Gas-kinetic Schemes PDF Author: Kun Xu
Publisher: World Scientific
ISBN: 9814623733
Category : Technology & Engineering
Languages : en
Pages : 335

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Book Description
Computational fluid dynamics (CFD) studies the flow motion in a discretized space. Its basic scale resolved is the mesh size and time step. The CFD algorithm can be constructed through a direct modeling of flow motion in such a space. This book presents the principle of direct modeling for the CFD algorithm development, and the construction unified gas-kinetic scheme (UGKS). The UGKS accurately captures the gas evolution from rarefied to continuum flows. Numerically it provides a continuous spectrum of governing equation in the whole flow regimes.

Measurement Technology for Micro-Scale Aerodynamics

Measurement Technology for Micro-Scale Aerodynamics PDF Author: Michael James Martin
Publisher:
ISBN:
Category :
Languages : en
Pages : 354

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Parallel Computational Fluid Dynamics 2007

Parallel Computational Fluid Dynamics 2007 PDF Author: Ismail H. Tuncer
Publisher: Springer Science & Business Media
ISBN: 3540927441
Category : Mathematics
Languages : en
Pages : 489

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Book Description
At the 19th Annual Conference on Parallel Computational Fluid Dynamics held in Antalya, Turkey, in May 2007, the most recent developments and implementations of large-scale and grid computing were presented. This book, comprised of the invited and selected papers of this conference, details those advances, which are of particular interest to CFD and CFD-related communities. It also offers the results related to applications of various scientific and engineering problems involving flows and flow-related topics. Intended for CFD researchers and graduate students, this book is a state-of-the-art presentation of the relevant methodology and implementation techniques of large-scale computing.

Efficient Numerical Techniques for Multiscale Modeling of Thermally Driven Gas Flows with Application to Thermal Sensing Atomic Force Microscopy

Efficient Numerical Techniques for Multiscale Modeling of Thermally Driven Gas Flows with Application to Thermal Sensing Atomic Force Microscopy PDF Author: Nathan Daniel Masters
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages :

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Book Description
The modeling of Micro- and NanoElectroMechanical Systems (MEMS and NEMS) requires new computational techniques that can deal efficiently with geometric complexity and scale dependent effects that may arise. Reduced feature sizes increase the coupling of physical phenomena and noncontinuum behavior, often requiring models based on molecular descriptions and/or first principles. Furthermore, noncontinuum effects are often localized to small regions of (relatively) large systemsprecluding the global application of microscale models due to computational expense. Multiscale modeling couples efficient continuum solvers with detailed microscale models to providing accurate and efficient models of complete systems. This thesis presents the development of multiscale modeling techniques for nonequilibrium microscale gas phase phenomena, especially thermally driven microflows. Much of this focuses on improving the ability of the Information Preserving DSMC (IP-DSMC) to model thermally driven flows. The IP-DSMC is a recent technique that seeks to accelerate the solution of direct simulation Monte Carlo (DSMC) simulations by preserving and transporting certain macroscopic quantities within each simulation molecules. The primary contribution of this work is the development of the Octant Splitting IP-DSMC (OSIP-DSMC) which recovers previously unavailable information from the preserved quantities and the microscopic velocities. The OSIP-DSMC can efficiently simulate flow fields induced by nonequilibrium systems, including phenomena such as thermal transpiration. The OSIP-DSMC provides an efficient method to explore rarefied gas transport phenomena which may lead to a greater understanding of these phenomena and new concepts for how these may be utilized in practical engineering systems. Multiscale modeling is demonstrated utilizing the OSIP-DSMC and a 2D BEM solver for the continuum (heat transfer) model coupled with a modified Alternating Schwarz coupling scheme. An interesting application for this modeling technique is Thermal Sensing Atomic Force Microscopy (TSAFM). TSAFM relies on gas phase heat transfer between heated cantilever probes and the scanned surface to determine the scan height, and thus the surface topography. Accurate models of the heat transfer phenomena are required to correctly interpret scan data. This thesis presents results demonstrating the effect of subcontinuum heat transfer on TSAFM operation and explores the mechanical effects of the Knudsen Force on the heated cantilevers.

Single and Two-Phase Flows on Chemical and Biomedical Engineering

Single and Two-Phase Flows on Chemical and Biomedical Engineering PDF Author: Ricardo Dias
Publisher: Bentham Science Publishers
ISBN: 1608052958
Category : Science
Languages : en
Pages : 667

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Book Description
Single and two-phase flows are ubiquitous in most natural process and engineering systems. Examples of systems or process include, packed bed reactors, either single phase or multiphase, absorber and adsorber separation columns, filter beds, plate heat exchangers, flow of viscoelastic fluids in polymer systems, or the enhanced recovery of oil, among others. In each case the flow plays a central role in determining the system or process behavior and performance. A better understanding of the underlying physical phenomena and the ability to describe the phenomena properly are both crucial to improving design, operation and control processes involving the flow of fluids, ensuring that they will be more efficient and cost effective. Expanding disciplines such as microfluidics and the simulation of complex flow physical systems, such as blood flow in physiological networks, also rely heavily on accurate predictions of fluid flow. Recent advances either in computational and experimental techniques are improving the existing knowledge of single and multiphase flows in engineering and physical systems of interest. This ebook is a review on the state-of-the-art and recent advances in critical areas of fluid mechanics and transport phenomena with respect to chemical and biomedical engineering applications.

The MEMS Handbook

The MEMS Handbook PDF Author: Mohamed Gad-el-Hak
Publisher: CRC Press
ISBN: 9781420050905
Category : Technology & Engineering
Languages : en
Pages : 1386

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Book Description
The revolution is well underway. Our understanding and utilization of microelectromechanical systems (MEMS) are growing at an explosive rate with a worldwide market approaching billions of dollars. In time, microdevices will fill the niches of our lives as pervasively as electronics do right now. But if these miniature devices are to fulfill their mammoth potential, today's engineers need a thorough grounding in the underlying physics, modeling techniques, fabrication methods, and materials of MEMS. The MEMS Handbook delivers all of this and more. Its team of authors-unsurpassed in their experience and standing in the scientific community- explore various aspects of MEMS: their design, fabrication, and applications as well as the physical modeling of their operations. Designed for maximum readability without compromising rigor, it provides a current and essential overview of this fledgling discipline.

Slip Model Performance for Micro-scale Gas Flows

Slip Model Performance for Micro-scale Gas Flows PDF Author: Matthew J. McNenly
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Rarefied Gas Dynamics

Rarefied Gas Dynamics PDF Author: Timothy J. Bartel
Publisher: American Institute of Physics
ISBN:
Category : Medical
Languages : en
Pages : 1004

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Book Description
This volume is concerned with the properties and flows of rarefied gases and with the interactions of these gases with solid surfaces and force fields. Topics include: low density aerodynamics, jets, plumes, and propulsion clusters, aerosols, and internal flows and vacuum systems.

Rarefied Gas Dynamics

Rarefied Gas Dynamics PDF Author: Ching Shen
Publisher: Springer Science & Business Media
ISBN: 3540272305
Category : Science
Languages : en
Pages : 406

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Book Description
Aerodynamics is a science engaged in the investigation of the motion of air and other gases and their interaction with bodies, and is one of the most important bases of the aeronautic and astronautic techniques. The continuous improvement of the configurations of the airplanes and the space vehicles aid the constant enhancement of their performances are closely related with the development of the aerodynamics. In the design of new flying vehicles the aerodynamics will play more and more important role. The undertakings of aeronautics and astronautics in our country have gained achievements of world interest, the aerodynamics community has made outstanding contributions for the development of these undertakings and the science of aerodynamics. To promote further the development of the aerodynamics, meet the challenge in the new century, summary the experience, cultivate the professional personnel and to serve better the cause of aeronautics and astronautics and the national economy, the present Series of Modern Aerodynamics is organized and published.