粉體在不同含水量及乾單位重下之熱傳導係數

林俊宏(Jin-Hung Lin)

指導教授 ： 田永銘

國立中央大學/工學院/土木工程學系/碩士(2006年)

摘要

本文進行多種粉體、渥太華砂-B.H. Bentonite與花崗岩碎石-日興土兩種複合土體熱傳導係數的量測。在粉體部分，以乾單位重與含水量為控制變數；在複合土體部分，以顆粒材料重量比為控制變數。量測方法乃採用張大猶(2004)所提出之熱探針連續量測法，此方法可消除熱探針與試體間接觸界面不均勻、減少試驗材料與時間、降低材料變異性等優點。另外，本文提出一套系統性方法，以決定各種粉體之McInnes’ model參數值，並將McInnes’ model參數與土壤物理性質建立關係，得到Modified McInnes’ model。在複合土體部分，以微觀力學模式進行其熱傳導係數的預測，並與實驗值作比較，以了解各預測模式之優劣情況。

關鍵字

粉體 ； 微觀力學模式 ； 熱傳導係數 ； 熱探針連續量測法

並列摘要

This study carries on the measurement of thermal conductivity of several kinds of powders, sand-B.H. Bentonite composite and Crushed granite-Z.H. Bentonite composite. On measuring powders, dry unit weight and water content are the controlled variables. For the composites, the controlled variable is the weight ratio of inclusions. And measurement method adopts continuous heat probe method proposed by Chang(2004). It avoids the surface contact problems inhibited in ASTM D5334 method and the individual differences of measurement from different specimens. In addition, this study proposes a set of systematical methods in order to determine various kinds of powder for McInnes’ model parameters. The McInnes’ model parameters are investigated to set up the relationship with physical properties of soils and transferred into Modified McInnes’ model. For the composites, the thermal conductivities are predicted by micromechanics models, and results are compared with experimental values to know the differences of each model.

並列關鍵字

Powder ； Continuous heat probe method ； Thermal conductivity ； Micromechanics models

參考文獻

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