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題 名 | 近飽和均質土壤之熱量傳遞=Heat Transfer in Nearly Saturated and Homogeneous Soils |
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作 者 | 方文村; | 書刊名 | 農業工程學報 |
卷 期 | 50:2 2004.06[民93.06] |
頁 次 | 頁85-96 |
分類號 | 434.222 |
關鍵詞 | 熱量傳遞; 散射; 氣泡; Heat transfer; Scattering; Air bubbles; |
語 文 | 中文(Chinese) |
中文摘要 | 土壤基本上包含了固體顆粒、水分、空氣的三相系統,土壤因之在微觀上是非均勻的介質。勢量波動模式可以發展來用以研究在非均一性之土壤內的熱量傳導(Karam,2000)。本研究基於土壤內周期性熱流的似波特性,將土壤內因含水量遞減形成氣泡現象加以考慮,勢量傳遞之傳播常數因氣泡的存在而有所不同,從而導致熱量的散射。採用Twersky (1952)及Qian(1993)的方法,由對單一氣泡存在土壤中所造成之熱波散射現象作分析,使用在氣泡表面上之兩個邊界條件:溫度變化及熱通量為連續,擴展單一氣泡之分析結果,以均一大小的球形氣泡散佈在原土壤之區域內為假設之理想狀況,視為近飽和狀態之土壤,本研究得到熱波於近飽和土壤中傳播的解析解。由解析解可以了解:同樣週期熱源下,在同一位置之近飽和土壤的溫度變化振幅較之飽和土壤為大,而差異之大小決定於土壤的飽和程度。 |
英文摘要 | Soils basically are three-phase systems consisting of solid particles, water, and air. Soils are therefore microscopically nonuniform media. Thermal wave models could be developed to study heat transfer in nonuniform soils (Karam, 2000). This study, which is based on the wave-like characteristics of periodic heat flow in soils, takes into account of the phenomena of air bubbles presence in soils due to decreasing water contents. With air bubbles present, the propagation constants of thermal waves become different and result in thermal scattering. The method by Twersky (1952) and Qian (1993) is adopted for the problem. The thermal wave scattering due to single air bubble in the soil is analyzed. Two boundary conditions on the bubble surface, which are continuous soil temperature change and continuous heat flux, are applied to solve the problem. The analysis results for single air bubble are then extended. It is assumed as an ideal situation that spherical air bubbles of uniform size are scattered in the soil domain. The soil under the assumption is considered as nearly saturated situation. This study obtains the analytical solution for thermal wave propagating in nearly saturated soils. According to the analytical solution, it can be understood that temperature change amplitude for nearly saturated soils is larger than for saturated soil at the same location in case of same periodic heat sources. The amount of the difference depends on the degree of saturation for the soils. |
本系統中英文摘要資訊取自各篇刊載內容。