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首頁(yè)> 外文學(xué)位 >A finite difference approach for mathematical simulation of soil vapor extraction from unsaturated zone.
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A finite difference approach for mathematical simulation of soil vapor extraction from unsaturated zone.

機(jī)譯：數(shù)學(xué)模擬從非飽和帶中抽出土壤的有限差分方法。

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摘要

The soil vapor extraction technique is a very cost-effective technique for in-situ subsurface remediation. The soil vapor extraction process involves volatilization, gas advection, gas diffusion, liquid diffusion, residual saturation, vapor-liquid equilibrium, and mass transfer. The variable mass transfer coefficient is governed by the diffusion process. Currently available models can be classified in two broad categories of equilibrium models and non-equilibrium models.;This dissertation proposes a non-equilibrium model that solves a set of partial differential equations for two-dimensional gas flow and advective-dispersive vapor transport in variably saturated porous media with a finite difference approach. The initial-boundary value problem is solved by using Crank-Nicolson scheme and Successive Over Relaxation method. The unique features of model include calculation of changes in the air permeability of the porous media and the amount of residual liquid after every time step. The model is intended for field-scale application to aid in design, development, and operation of high-efficiency soil vapor extraction systems.
機(jī)譯：土壤蒸氣提取技術(shù)是用于現(xiàn)場(chǎng)地下修復(fù)的非常經(jīng)濟(jì)有效的技術(shù)。土壤蒸汽提取過(guò)程涉及揮發(fā)，氣體對(duì)流，氣體擴(kuò)散，液體擴(kuò)散，殘留飽和度，氣液平衡和傳質(zhì)。可變的傳質(zhì)系數(shù)由擴(kuò)散過(guò)程控制。目前可用的模型可分為兩大類：平衡模型和非平衡模型。本文提出了一種非平衡模型，該模型求解了二維偏流方程組，該變量方程分別用于二維氣體流動(dòng)和對(duì)流-彌散蒸氣輸運(yùn)。飽和多孔介質(zhì)的有限差分法。通過(guò)使用Crank-Nicolson方案和逐次超松弛法解決了初邊值問(wèn)題。該模型的獨(dú)特功能包括計(jì)算每個(gè)時(shí)間步驟后多孔介質(zhì)的透氣性和殘留液體量的變化。該模型旨在用于現(xiàn)場(chǎng)規(guī)模的應(yīng)用，以幫助設(shè)計(jì)，開(kāi)發(fā)和操作高效的土壤蒸汽提取系統(tǒng)。

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  • 作者

    Armstrong, Amit.;

  • 作者單位

    Texas Tech University.;

  • 授予單位 Texas Tech University.;
  • 學(xué)科 Engineering Environmental.;Hydrology.;Engineering Civil.
  • 學(xué)位 Ph.D.
  • 年度 1998
  • 頁(yè)碼 124 p.
  • 總頁(yè)數(shù) 124
  • 原文格式 PDF
  • 正文語(yǔ)種 eng
  • 中圖分類
  • 關(guān)鍵詞

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