Thermowell Wake Frequency Calculation [updated] -

Suppose we have a thermowell with a diameter of 1 inch (25 mm) and a fluid flow velocity of 10 ft/s (3.05 m/s). The fluid density is 62.4 lb/ft³ (1000 kg/m³), and the dynamic viscosity is 0.018 lb/ft·s (0.0267 Pa·s). The Strouhal number is assumed to be 0.25.

A thermowell is a pressure-tight receptacle inserted into a process pipe or vessel to protect a temperature sensor (e.g., RTD, thermocouple) from corrosive, high-pressure, or high-velocity fluids. When fluid flows past a thermowell, alternating vortices shed from its downstream side—a phenomenon known as or a Kármán vortex street . thermowell wake frequency calculation

The industry standard for these evaluations is ASME PTC 19.3 TW-2016, which provides the mathematical framework to ensure a thermowell can withstand the static and dynamic stresses of a process. The Science of Wake Frequency: Vortex Shedding Suppose we have a thermowell with a diameter