| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic flow meter and an ultrasonic calorimeter without limitation of a using temperature range.SOLUTION: In addition to ultrasonic transmission/reception devices 2 and 3 disposed on an upstream side and a downstream side of a measurement pipe 1, a temperature sensor 4 for detecting a temperature of a fluid flowing through the measurement pipe 1 is provided. For instance, when the fluid is water, in a kinetic viscosity calculation part 506, kinetic viscosity &ngr; is obtained from a water temperature T obtained from a sound velocity c in a temperature range of 0-55°C, and the kinetic viscosity &ngr; is obtained by a water temperature TR detected by the temperature sensor 4 in the temperature range of 55-100°C. A Reynolds number Re is calculated from the kinetic viscosity &ngr; obtained by the kinetic viscosity calculation part 506 and a flow velocity V' obtained by a flow velocity calculation part 502, a flow rate correction coefficient k is obtained from the Reynolds number Re, and a measurement flow rate Q' is corrected by the obtained flow rate correction coefficient k. |
