检索结果-内蒙古大学图书馆

THE KRAMERS PROBLEM - VELOCITY SLIP AND DEFECT FOR A HARD-SPHERE GAS WITH ARBITRARY ACCOMMODATION

ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK 1990年第2期41卷 245-253页

作者： LOYALKA, SK HICKEY, KA 1. Nuclear Engineering Program and Particulate Systems Research Center University of Missouri-Columbia 65211 Columbia Missouri USA

The half-space problem of rarefied gas flow (the Kramers problem) is considered for the linearized Boltzmann equation and arbitrary gas-surface interaction. Accurate numerical results for the velocity slip coefficient and velocity defect are obtained for the rigid sphere interaction and Maxwellian boundary condition.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Removal of microorganisms/particulates from indoor air

引用

Studies in Surface Science and Catalysis 1999年 120 B卷 821-831页

作者： Ghosh, T.K. Hines, A.L. Particulate Systems Research Center Nuclear Engineering Program University of Missouri-Columbia Columbia MO 65211 United States

This chapter describes the removal of microorganisms and particulates from indoor air. Granular bed filters may be used for particulate removal from air. These systems have been developed mainly for use in industrial processes and are not suitable for use in indoor settings. However, if desiccant materials are used as the filtering media, these types of units may be used for cleaning indoor air. Desiccant-based air conditioning systems are used for cleaning indoor air. In desiccant based systems, moist air is passed through a bed containing desiccants, where moisture is removed from air by adsorption. The dry air from the bed is further conditioned to adjust its temperature and humidity. Silica gel, molecular sieves, and activated alumina are primarily used as desiccants because of their excellent water adsorption capacity. particulate removal systems work on the principle that as a gas stream containing particle flows through a filtration device the particles are acted on by various external forces that cause their separation from the gas stream. The mechanisms that cause the separation of the particles from the gas stream include sedimentation electrostatic precipitation, inertial deposition, and Brownian diffusion.

关键词：

来源：评论

学校读者我要写书评

暂无评论

POISEUILLE FLOW OF A RAREFIED-GAS IN A CYLINDRICAL TUBE - SOLUTION OF LINEARIZED BOLTZMANN-EQUATION

引用

PHYSICS OF FLUIDS A-FLUID DYNAMICS 1990年第11期2卷 2061-2065页

作者： LOYALKA, SK HAMOODI, SA Nuclear Engineering Program and Particulate Systems Research Center University of Missouri—Columbia Columbia Missouri 65211

The existence of a minimum in the cylindrical Poiseuille flow of a rarefied gas has been known since the experiments of Knudsen [Ann. Phys. 4, 75 (1.09)]. Previously, the phenomenon has been studied with models of the Boltzmann equation, but results for the Boltzmann equation itself have not been reported. In the present paper, proceeding from recent studies, first the SN numerical algorithm for solving the linearized Boltzmann equation for the cylindircal geometry is outlined. Then, explicit numerical results for a rigid sphere gas and the boundary condition of diffuse specular reflection are obtained. The results show a minimum of the flow rate, and generally, provide a good description of the experimental data.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Heat transfer in rarefied gases: Critical assessments of thermal conductance and accommodation of argon in the transition regime

引用

The Physics of Fluids 1988年第10期31卷 2854-2864页

作者： Lloyd B. Thomas C. L. Krueger S. K. Loyalka Physical Chemical Laboratory University of Missouri—Columbia Columbia Missouri 65211 Nuclear Engineering Program and Particulate Systems Research Center University of Missouri—Columbia Columbia Missouri 65211

Heat transfer measurements from thin filaments to argon gas in cells of cylindrical symmetry are made under extreme clean surface conditions so that known constant values of α, the thermal accommodation coefficient, on the filament pertain over the full range of pressures, 0.01.40 Torr. The results are used in an attempt to assess merit of principal theoretical treatments of heat transfer in the transition regime by extracting α according to each treatment and comparing results with the presumed known value. Before relative merit of the theories can be assigned with confidence, a wider differentiation in the α values obtained is needed. It is expected that this may result when similar experiments for the higher α gases, krypton and xenon, can be completed and critically examined.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Kinetic Theory of Planar Condensation and Evaporation

引用

Transport Theory and Statistical Physics 1991年第2-3期20卷 237-249页

作者： Loyalka, S.K. Nuclear Engineering Program and Particulate Systems Research Center University of Missouri - Columbia Columbia Missouri 65211 United States

The problem of planar condensation/evaporation of a monatomic vapor is solved based on the linearized Boltzmann equation. Accurate numerical results for the pressure and temperature jumps, and the macroscopic profiles for the density and temperature are reported for rigid sphere molecular interaction. Variational expressions for the jumps for several different molecular force laws are evaluated. For rigid spheres, these agree well with the numerical results but are otherwise found to be relatively insensitve to the intermolecular force laws. © 1.91. Taylor & Francis Group, LLC. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Erratum: ‘‘Poiseuille flow of a rarefied gas in a cylindrical tube: Solution of linearized Boltzmann equation’’ [Phys. Fluids A 2, 2061.(1.90)]

引用

Physics of Fluids A: Fluid Dynamics 1991年第11期3卷 2825-2825页

作者： S. K. Loyalka S. A. Hamoodi Nuclear Engineering Program and Particulate Systems Research Center University of Missouri−Columbia Columbia Missouri 65211

S. K. Loyalka, S. A. Hamoodi; Erratum: ‘‘Poiseuille flow of a rarefied gas in a cylindrical tube: Solution of linearized Boltzmann equation’’ [Phys. Fluids A 2,

关键词：

来源：评论

学校读者我要写书评

暂无评论

Navy's CFC & Halon elimination program

引用

NAVAL ENGINEERS JOURNAL 2000年第1期112卷 91-112页

作者： Toms, GS Breslin, DA Brunner, GP Thill, JC Gregory S. Toms RE:is the CFC & Halon Elimination Program Manager for the Naval Sea Systems Command (NAVSEA). He received a master of science degree in mechanical engineering from the University of Maryland and a B.S. degree in mechanical engineering from West Virginia University. From 1984 to 1997 he was employed at the Naval Surface Warfare Center Carderock Division Annapolis Detachment (formerly David Taylor Research Center) where he worked on the development of advanced centrifugal compressor air conditioning plants for shipboard applications. He received the Stratospheric Ozone Protection Award in 1998 from the U.S. Environmental Protection Agency in recognition of his exceptional leadership and technical achievements in eliminating ozone-depleting substances from Navy ships. He is licensed as a registered Professional Engineer in the state of Texas. David A. Breslin P.E.:is the Director of Technical Operations for the Naval Surface Warfare Center and is the Chairperson of the ASNE Committee on Environmental Engineering. He received a master of science in aerospace engineering from Virginia Tech in 1991 a master of engineering administration in industrial & systems engineering from Virginia Tech in 1991 and a bachelor of engineering in mechanical engineering from Stevens Institute of Technology in 1985. From 1993 to 1997 he was the program manager of the Naval Sea Systems Command's CFC & Halon Elimination Program. Because of his many efforts he received a Stratospheric Ozone Protection Award in 1995 from the U.S. Environmental Protection Agency in recognition of “exceptional contributions to global environmental protection”. Gregory P. Brunner:was employed by the Carderock Division of the Naval Surface Warfare Center and Naval Sea Systems Command (NAVSEA) from 1983 until 1997. From 1993 to 1997 he served as the R&D program manager for the NAVSEA CFC & Halon Elimination Program Office. Program efforts resulted in the development of new refrigerants for backfit into existing shipboard air-conditioning

The domestic production of the most powerful Ozone-Depleting Substances (ODSs) has permanently ceased and the abundant supplies of a number of inexpensive refrigerants, fire-fighting agents, and solvents, once taken for granted, are now a thing of the past. The Navy's original strategy of conserving ODSs, converting systems and processes where feasible, relying on strategic reserves where necessary, and developing "ozone-friendly" equip ment for new-design surface ships and submarines is succeeding. The purpose of this paper is to document the Navy's efforts to date relative to combating the threat to uninterrupted Fleet operations posed by the cessation of ODS production. Specifically, this paper addresses the Navy's shipboard conversion {1.s for air-conditioning and refrigeration (AC&R) systems, the development of next-generation AC&R systems, the selection of halon substitutes for new-construction fire-fighting systems, and the Navy's alternative to CFC-1.3 in the cleaning of critical oxygen systems.

关键词： conversion program Ozone depleting substances trichlorotrifluoroethane GRANTS fire fighting strategic reserves Solvents oxygen systems Submarine Halons

来源：评论

学校读者我要写书评

暂无评论

Development of Collaborative engineering Environments for Spacecraft Design

引用

AIP Conference Proceedings 2003年第1期654卷 907-916页

作者： Robert C. Singleterry, Jr Bradley D. Johns Kwok Y. Fan F. McNeil Cheatwood Garry D. Qualls Todd A. Wareing John McGhee Shawn Pautz Anil K. Prinja Frederick Gleicher Greg Failla Jaroslaw Sobieszczanski‐Sobieski John W. Wilson 1Structures and Materials Competency NASA Langley Research Center Hampton VA 23681 2Swales Aerospace NASA Langley Research Center Hampton VA 23681 3Space Access & Exploration Program Office NASA Langley Research Center Hampton VA 23681 4Systems Engineering Competency NASA Langley Research Center Hampton VA 23681 5Transport Methods Group CCS‐4 Los Alamos National Laboratory Los Alamos NM 87545 6University of New Mexico Chemical and Nuclear Engineering Albuquerque NM 87131 7ICEM CFD Engineering Berkeley CA 94705

The hazards of ionizing radiation in space continue to be a limiting factor in the design of missions, spacecraft, and habitats. Shielding against such hazards is an enabling technology in the human and robotic exploration and development of space. If the design of the radiation shielding is not optimal for the mission, then excess mass will be launched, mission costs will be higher than necessary, and useful payload will be reduced. This reduced mission capability scenario can be repeated for other technical design disciplines. These other disciplines can also effect each other’s requirements. A collaborative engineering environment can optimize ALL design parameters for cost (or another parameter) producing a spacecraft that will meet all mission requirements at the minimum cost. This paper describes two environments that include space radiation analyses and the inclusion within a larger optimization methodology.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Uniform National Discharge Standards - Overview and implications for future naval engineering

引用

NAVAL ENGINEERS JOURNAL 1999年第3期111卷 219-235页

作者： Kopack, D Smith, G Kim, D Erne, DL David F. Kopack:is a Program Manager in the Naval Sea Systems Command Office of Environmenta1 Protection Occupational Safety and Health SEA 00T. Mr. Kopack received his bachelor and master of science degrees in the physical sciences and management from the University of Maryland. Mr. Kopack has 20 years of experience in ship design and engineering industrial facility operations and program management. Gordon D. Smith:is a Chemical Engineer with the Carderock Division Naval Surface Warfare Center in Bethesda Maryland and is working in the Naval Sea Systems Command Environmental and Auxiliary Systems Group. SEA 03L. Mr. Smith received his bachelor of science degree in chemical engineering from The Ohio State University. He has over 13 years of ronmental issues. In addition to supporting the development of Uniform National Discharge Standards he has been involved in research design testing and development of pollution abatement technologies suitable for use aboard Navy Ships. Don K. Kim:is a Senior Mechanical Engineer with the naval architecture and marine engineering firm of M. Rosenblatt & Son Inc. in Arlington Virginia. Mr. Kim received his bachelor of science and master of engineering degrees in mechanical engineering from the University of Virginia. He is a registered Professional Engineer in the Commonwealth of Virgina. Mr. Kim has ten years of experience in the design installation maintenance and repair of shipboard mechanical systems equipment and components with specific expertise in compressor pump and fan design and operation. He is a member of the American Society of Naval Engineers and the American Society of Mechanical Engineer. David L. Erne:is an Associate with Booz Allen and Hamilton Inc. in Arlington Virginia. Mr. Erne received his bachelor of science degree in chemical engineering from the University of Idaho. He has over twelve years of experience in environmental program management and consulting. In addition to his support for the Uniform National Discharge Standards prog

In the Fiscal Year 1.96 National Defense Authorization Act, Congress amended the Clean Water Act to provide the Department of Defense and the Environmental Protection Agency authority to jointly establish standards for incidental discharges from Armed Forces' vessels. The uniform national standards would apply to discharges from vessels of the Navy, Military Sealift Command, Army, Marine Corps, Air Force, and Coast Guard to the navigable waters and contiguous zone of the U.S. and its territories. Uniform National Discharge Standards (UNDS) will require control of discharges, by either a technology or management practice. UNDS will facilitate the Armed Forces' ability to better design and build future vessels to be environmentally sound and to maintain the operational flexibility of Armed Forces' vessels both domestically and internationally. The development of standards for Armed Forces' vessel discharges may have greater impact on naval engineering requirements for future vessels than any other single environmental issue, These standards are expected to stimulate the development of innovative vessel pollution control technologies, which on be used for both Armed Forces' vessels and commercial shipping vessels. This paper provides an overview of UNDS development, summarizes the results of UNDS Phase I, provides a summary overview of the preliminary approach for accomplishing UNDS Phase Il, and discusses implications for future naval engineering efforts.

关键词： Replenishment at sea homeland defense shipbuilding Military Personnel Uniform home range Treated water Naval engineering Uniforms Implication Clean Water Act Coastguards

来源：评论

学校读者我要写书评

暂无评论

Doe's effort to reduce truck aerodynamic drag - joint experiments and computations lead to smart design

Doe's effort to reduce truck aerodynamic drag - joint experi...

引用

34th AIAA Fluid Dynamics Conference and Exhibit 2004

作者： McCallen, Rose C. Salari, Kambiz Ortega, Jason M. DeChant, Larry J. Hassan, Basil Roy, Christopher J. Pointer, W. David Browand, Fred Hammache, Mustapha Hsu, Tsun-Ya Leonard, Anthony Rubel, Mike Chatalain, Philippe Englar, Robert Ross, James Satran, D. Heineck, James T. Walker, Stephen Yaste, D. Storms, B. Lawrence Livermore National Laboratory Livermore CA 94551 United States Sandia National Laboratories Albuquerque NM 87185-0825 United States Auburn University Auburn AL 36849 United States Argonne National Laboratory Argonne IL 60439 United States University of Southern California LosAngeles CA 90089-1191 United States Georgia Tech Research Institute Atlanta GA 30332 United States NASA Ames Research Center Moffet Field CA 94035 United States Center for Applied Scientific Computing P.O. Box 808 L-98 United States New Technologies Engineering Division P.O. Box 808 L-644 United States Aerosciences and Compressible Fluid Mechanics Dept. PO Box 5800 MS 0825 United States Aerospace Engineering Dept. 211 Aerospace Engineering Bldg United States Nuclear Engineering Division NE-208 United States Aerospace and Mechanical Engineering MS 1191 United States Engineering and Applied Science 1200 East California Blvd. MC 301-46 United States Graduate Aeronautical Laboratories 1200 East California Blvd. MC 205-45 United States Aerospace Transportation and Advanced Systems Code 0844 United States Systems Analysis Branch MS 260-1 United States Aeronautical Projects and Program Office MS 260-1 United States

ISBN: (纸本)9781624100314

At 70 miles per hour, overcoming aerodynamic drag represents about 65% of the total energy expenditure for a typical heavy truck vehicle. The goal of this US Department of Energy supported consortium is to establish a clear understanding of the drag producing flow phenomena. This is being accomplished through joint experiments and computations, leading to the 'smart' design of drag reducing devices. This paper will describe our objective and approach, provide an overview of our efforts and accomplishments, and discuss our future direction. © 2004 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Aerodynamic drag

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：