A Null-Buoyancy Thermal Flow Meter With Potential Application to the Measurement of the Hydraulic Conductivity of Soils

[摘要]：A null-buoyancy thermal flow sensor is described; it is designed specifically for the measurement of very slow downward fluid flows in a vertical pipe in which a glass-rod thermistor is concentrically located. Sensor power dissipation in this thermistor i

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