石炭・水スラリーの輸送物性と円管内熱伝達係数

概要

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Measurements of transport properties of highly loaded coal-water mixture (CWM), such as specific heat, thermal conductivity, and flow curve, are performed to investigate the characteristics of heat transfer in pipe flow. The specific heat of CWM depends on both the specific heat values of coal and water, and correlates well with the mass fraction of coal. The thermal conductivity, on the other hand, correlates well with the volume fraction of coal and is shown to be expressed well by Maxwell's equation. Heat transfer experiments are also performed for CWM flowing through a vertical circular pipe to obtain the average heat transfer coefficients. The data are shown in laminar flow and for uniform wall temperature conditions. Through the experiments, pressure drop data are also measured to determine the flow characteristics, i.e., the flow curves. It is shown that the flow behavior of CWM is able to be approximated well by a Bingham plastic fluid model. Using the above mentioned transport properties, correlation of the average heat transfer coefficients is attempted and the applicability of a previously proposed correlation equation is discussed.
山形大学の論文
2000-02-15