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  • 1
    Series available for loan
    Series available for loan
    Transport of water in frozen soil : I. Experimental determination of soil-water diffusivity under isothermal conditions (1983)
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
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    Call number: ZSP-201-83/22
    In: CRREL Report, 83-22
    Description / Table of Contents: A new experimental method for measuring the soil-water diffusivity of frozen soil under isothermal conditions is introduced. The theoretical justification of the method is presented and the feasibility of the method is demonstrated by experiments conducted using marine-deposited clay. The measured values of the soil-water diffusivity are found comparable to reported experimental data.
    Type of Medium: Series available for loan
    Pages: 13 Seiten , Illustrationen
    Series Statement: CRREL Report 83-22
    URL: https://apps.dtic.mil/docs/citations/ADA135419
    URL: https://hdl.handle.net/11681/9297
    Language: English
    Location: AWI Archive
    Branch Library: AWI Library
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  • 2
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    Series available for loan
    Numerical computation of the shock wave diffracted by a circular cylindrical cavity in elastic-plastic media (1970)
    Hanover, NH : Corps of Engineers, U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
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    Call number: ZSP-202-279
    In: Research report
    Description / Table of Contents: CONTENTS: Preface. - Nomenclature. - Introduction. - Basic equations. - Equation of motion. - Equation of continuity. - Artificial viscosity. - Equation of state. - Equation of motion. - Equation of continuity. - Artificial viscosity. - Equation of state. - Finite difference approximation. - Equation of motion. - Equation of continuity. - Artificial viscosity. - Equation of state. - Boundary conditions. - Results and discussion. - Literature cited. - Abstract.
    Description / Table of Contents: A finite difference method for predicting the effect of shock waves on a circular cylindrical cavity in elastic-plastic media was studied. A two-dimensional Lagrangean code was found quite satisfactory. Attenuation of the shock waves through the cavity and the deformation of the cavity wall were discussed.
    Type of Medium: Series available for loan
    Pages: v, 23 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 279
    URL: http://www.worldcat.org/oclc/5973985
    Language: English
    Branch Library: AWI Library
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  • 3
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    Stability of difference approximation to shock wave propagation in inhomogeneous elastic-plastic media (1969)
    Hanover, NH : Corps of Engineers, U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
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    Call number: ZSP-202-277
    In: Research report
    Description / Table of Contents: CONTENTS: Preface. - Nomenclature. - Introduction. - Basic equations. - Constitutive relations. - Elastic region. - Plastic region. - Stability of the differential equation. - Stability of the difference equation. - Literature cited.
    Description / Table of Contents: An analysis is made of the stability of difference approximation to one-dimensional shock wave propagation in elastic-plastic media. The necessary condition for stability is obtained.
    Type of Medium: Series available for loan
    Pages: iv, 9 Seiten
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 277
    URL: http://www.worldcat.org/oclc/5974046
    Language: English
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  • 4
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    Model analysis of vehicle trafficability with application to surface effect vehicles on sea ice fields (1972)
    Hanover, NH : Corps of Engineers, U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
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    Call number: ZSP-202-298
    In: Research report
    Description / Table of Contents: CONTENTS: Preface. - Abstract. - I. Introduction. - II. A statistical theory of trafficability. - Statistical descriptions of trafficability. - Statistical modeling of trafficability. - Trafficability in a variable space with comparison to a fixed space. - III. Statistical description of sea ice. - Homogeneous, isotropic, and normal random function. - Upper bound of probability for finding an obstacle derived from two-point probability density function. - IV. Design criteria of a SEV derived from sea ice surface roughness. - Literature cited. - Appendix: Statistics of a variable space.
    Description / Table of Contents: Efforts were made to derive the design criteria of surface effect vehicles operated on arctic sea ice. Statistical theories were developed to describe trafficability of the vehicles and topography of the sea ice. By the use of actual sea ice surface profiles obtained by an aerial laser profiler, the usefulness of the present statistical method was demonstrated.
    Type of Medium: Series available for loan
    Pages: iii, 19 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 298
    URL: http://www.worldcat.org/oclc/5974570
    Language: English
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  • 5
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    Effect of Thermal Gradient on Ionic Diffusion in Frozen Earth Materials : II: Theoretical; 2.
    Associated volumes
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    Call number: ZSP-202-285
    In: Effect of thermal gradient on ionic diffusion in frozen earth materials
    Description / Table of Contents: CONTENTS: Introduction. - Part I. - Formulation of problem. - Solution of the Laplace transform equation. - Inverse transformation. - Computation of concentration distribution. - Results of computation. - Part II. - Introduction. - Numerical solution of initial-value problems for linear parabolic partial differential equations. - Application. - Computation of the diffusion process [Xi]t. - Results of computation. - Literature cited. - Abstract.
    Description / Table of Contents: The influence of a temperature gradient on the redistribution of chemicals by diffusion through thin films of interfacial water in frozen sedl was predicted by two different methods. In one case, an exact solution of the diffusion equation with a distance-dependent diffusion coefficient was obtained. Secondly, a new approach based on the Monte Carlo method was developed. The advantage of the Monte Carlo method is that the dependence of the diffusion coefficient on distance may assume any functionality where one exponential form was used in obtaining the exact solution. The ionic concentration distributions computed using both approaches were in excellent agreement with experimental results. In all cases, the concentration distribution was virtually the same as that obtained in the absence of a thermal gradient, indicating that thermal gradients have little influence on the diffusion of ions in frozen soil.
    Type of Medium: Series available for loan
    Pages: iii, 35 Seiten , Illustrationen
    Series Statement: 285
    URL: http://www.worldcat.org/oclc/5976449
    Language: English
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  • 6
    Electronic Resource
    Electronic Resource
    Application of Branching Process for Liquid Atomixation (1970)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 9 (1970), S. 98-100 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i160033a016
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  • 7
    Electronic Resource
    Electronic Resource
    Nonlinear convective diffusion: A hyperfiltration application (1967)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 13 (1967), S. 1092-1098 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A nonlinear unsteady state convective diffusion problem that describes the performance of a constant pressure cell is studied. The cell can be used to either determine membrane constants or to carry out batch filtration operations. It consists of a cylinder closed by a semipermeable membrane at one end and a piston at the other.The nonlinear partial differential equation governing the system was solved by both integral methods and the use of a similarity transformation. The similarity approach formulates the solution in the form of an infinite series and reduces the problem to finding the solution of an infinite system of ordinary differential equations. The series solution can be considered to be exact but its convergence is questionable for large values of time in the event B ≠ 0; when B = 0, the convergence is substantially better.Approximate solutions obtained by integral methods were examined in detail. It was found that the results obtained by these methods can involve serious errors, under certain circumstances, and these errors seem unpredictable a priori. Consequently, it is concluded that considerable care should be taken in the use of integral methods for solving mass transfer problems in which the velocity field is coupled with the convective diffusion equation and its boundary conditions.The numerical results obtained in this work are sufficiently comprehensive to be used, in conjunction with experimental data, to determine membrane constants which are required for the design of both continuous and batch membrane separation systems.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690130611
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  • 8
    Electronic Resource
    Electronic Resource
    Creeping flow of power-law fluid over newtonian fluid sphere (1968)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 14 (1968), S. 145-151 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A technique which is a combination of Galerkin's method and variational principle was developed and used for the approximate solution of creeping flow of power-law fluid over a Newtonian fluid sphere. The stream functions (both internal and external) and drag coefficient are expressed in terms of three parameters: the flow behavior index of the power law fluid, the external Reynolds number, and a viscosity ratio parameter \documentclass{article}\pagestyle{empty}\begin{document}$${\rm X} = \frac{{\mu ia^{n - 1} }}{{KV_{\alpha ^{n - 1} } }}$$\end{document}. Comparisons with existing experimental data are also given.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690140125
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  • 9
    Electronic Resource
    Electronic Resource
    Viscous incompressible non-Newtonian flow around fluid sphere at intermediate Reynolds number (1970)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 16 (1970), S. 569-574 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Approximate expressions of velocity profile and drag coefficients have been obtained for viscous incompressible non-Newtonian flow over a fluid sphere in the intermediate Reynolds number range.The equations of motion of both external and internal fluids are satisfied by using Galerkin's method. The internal fluid is assumed to be Newtonian, while the external is assumed to be non-Newtonian and can be described by the power law model. Furthermore, the condition that the tangential stress is transmitted across the fluid-fluid interface without diminution is also satisfied with Galerkin's condition.Comparisons are also made between the predicted results and the experimental data available in the literature. The possible reasons for the discrepancy are also discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690160411
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  • 10
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    Mathematical Modeling and Validation of the Thermal Regimes in Tundra Soils, Barrow, Alaska (1972)
    Taylor & Francis
    Details
    Publication Date: 1972-01-01
    Print ISSN: 0004-0851
    Topics: Geography , Geosciences
    Published by Taylor & Francis
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