Abstract
The flow rate of insulin from insulin pumps for diabetic patients is less than 3.0 μl/min, and the average flow velocity in a tube with a diameter of 0.4 mm becomes less than 0.4 mm/s resulting in the maximum Reynolds number of about 0.2. A thermo-trace type flow meter is employed for a low meter in this very small range of flow rate and velocity. A theoretical analysis and preliminary experiment were conducted for the flow meter. It was found that the influence of heat conduction in the direction of the tube axis must be included which is usually ignored in the boundary flow analyses.
