circulation medium meaning in English

流通货币

The paper introduces the fundamentals of the temperature distribution in the borehole drilled in the frozen formation , and discusses the ascertainment of these parameters , including the mass quantity of circulation medium , the coefficient of thermal conductivity of drilling rods , the coefficient of the intensity of heat exchange and the coefficient of unstable heat exchange between the rock and the circulation medium , and the rising of the temperature of the circulation medium in the bottom of the bore
摘要介绍了冻土钻孔内温度分布研究的理论基础，其中主要讨论了冲洗介质的质量流量、钻杆杆壁的导热系数、岩石同冲洗介质的热交换强度系数与不稳定热交换系数，以及孔底冲洗介质温度升高值的确定。