Download or read book Two Dimensional Heat Transfer During Steady State Water Flow Through Soil Columns written by Koon-tee Erh and published by . This book was released on 1969 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Investigation of Transient Two dimensional Coupled Heat and Moisture Flow in Soils written by Lester Sheng-wei Shen and published by . This book was released on 1986 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1989 with total page 1296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling Heat Transfer in Saturated Soil written by Chu Wang and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat transfer through porous media occurs for a variety of important engineering applications, including geothermal energy extraction, packed beds, waste disposal, and buried high voltage power cables. Associated models have been developed with various capabilities, and often assume a condition of local thermal equilibrium (LTE), in which adjacent solid and fluid temperatures are equal. This considerably simplifies the modeling process (i.e., one energy equation) and allows for the development of analytical solutions that otherwise would be intractable. However, the LTE assumption represents a significant compromise for certain conditions, including soils with large particles, high fluid flow velocity, and small thermal conductivities for solid and fluid. Such conditions can invalidate the LTE assumption, giving rise to local thermal non-equilibrium (LTNE) in which adjacent solid and fluid phases have different temperatures. For LTNE conditions, the heat transfer process for each phase must be analyzed separately and heat transfer occurs between the phases based on the local temperature difference. Closed-form analytical solutions are first derived for one-dimensional heat transfer saturated soil with steady fluid flow and effective porosity (i.e., the fraction of total porosity that contributes to fluid flow). The solutions yield distributions of temperature and total heat flux for both transient and steady-state conditions within an incompressible soil layer having constant temperature boundaries. A numerical model, called HT1, is then developed for LTE heat transfer in saturated incompressible layered soil with steady fluid flow and effective porosity. The key to HT1 is the definition of separate columns for the solid matrix and mobile pore fluid. The solid matrix column includes the solid phase and immobile pore fluid and consists of fixed elements. The mobile pore fluid column uses Lagrangian element-tracking to follow the fluid motion, which reduces numerical dispersion and simplifies heat transfer to that of dispersive flux between contiguous elements. The HT2 numerical model is further developed using HT1 as a point of departure. Following HT1, HT2 uses a series-parallel approach for heat transfer and accounts for advection, conduction, thermal mechanical dispersion, and interstitial heat transfer mechanisms. The key to HT2 is the definition of separate columns within the soil that represent immobile and mobile components under fluid flow conditions. This approach is well suited for LTNE analysis because heat transfer in each column is treated separately, and local temperature differences allow for the calculation of kinetic heat transfer between the columns. Finally, this study numerically assesses the conditions under which the conventional LTE model is inapplicable and the LTNE condition must be considered, with solution charts presented for the threshold between LTE and LTNE conditions. Validation of the developed models has been performed with existing analytical solutions, numerical solutions, and experimental data. Comprehensive parametric studies are also presented.

Download or read book Abstracts of North American Geology written by Geological Survey (U.S.) and published by . This book was released on 1971-07 with total page 1178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book CRREL Report written by and published by . This book was released on 1993 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1974 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Treatise on Water Science written by and published by Newnes. This book was released on 2010-09-01 with total page 2131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water quality and management are of great significance globally, as the demand for clean, potable water far exceeds the availability. Water science research brings together the natural and applied sciences, engineering, chemistry, law and policy, and economics, and the Treatise on Water Science seeks to unite these areas through contributions from a global team of author-experts. The 4-volume set examines topics in depth, with an emphasis on innovative research and technologies for those working in applied areas. Published in partnership with and endorsed by the International Water Association (IWA), demonstrating the authority of the content Editor-in-Chief Peter Wilderer, a Stockholm Water Prize recipient, has assembled a world-class team of volume editors and contributing authors Topics related to water resource management, water quality and supply, and handling of wastewater are treated in depth

Download or read book Recharge of Phreatic Aquifers in Semi Arid Areas written by Ian Simmers and published by Routledge. This book was released on 2017-10-19 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater use is of fundamental importance to meet the rapidly expanding urban, industrial and agricultural water requirements in (semi) arid areas. Quantifying the current rate of groundwater recharge and define its variability in space and time are thus prerequesites for efficient groundwater resource managment in these regions, where such resources are often the key to economic development. Attention focuses on recharge of phreatic aquifers, often the most readily-available and affordable source of water in (semi) arid regions. These aquifers are also the most susceptible to contamination, with the recharge rate determining their level of vulnerability. (Semi) arid zone recharge can be highly variable, the greater the aridity, the smaller and potentially more variable the natural flux. Its determination is an iterative process, involving progressive data collection and resource evaluation; there is also a need to use more than one technique to verify results. Direct, localised and indirect recharge mechanisms from a spectrum of known sources are addressed in the framework of recharge from precipitation, intermittant flow and permanent water bodies. The approach taken for each of these reflects the nature and current understanding of the processes involved. The volume also reviews current recharge estimation challenges, outlines recent developments and offers guidance for potential solutions.

Download or read book Agronomy Abstracts written by and published by . This book was released on 1987 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes abstracts of the annual meetings of the American Society of Agronomy; Soil Science Society of America; Crop Science Society of America ( - of its Agronomic Education Division).

Download or read book Solute Movement in the Soil root System written by Peter Hague Nye and published by Univ of California Press. This book was released on 1977 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The National Union Catalogs 1963 written by and published by . This book was released on 1964 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings written by Soil Science Society of America and published by . This book was released on 1967 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biological Agricultural Index written by and published by . This book was released on 1971 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Federal Software Exchange Catalog written by and published by . This book was released on 1986 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Soil Sciences Two Volume Set written by Pan Ming Huang and published by CRC Press. This book was released on 2018-10-03 with total page 2272 pages. Available in PDF, EPUB and Kindle. Book excerpt: An evolving, living organic/inorganic covering, soil is in dynamic equilibrium with the atmosphere above, the biosphere within, and the geology below. It acts as an anchor for roots, a purveyor of water and nutrients, a residence for a vast community of microorganisms and animals, a sanitizer of the environment, and a source of raw materials for co