![]() ![]() ![]() The vortex shedding frequency (or Wake frequency) is linear with flow velocity and inversely proportional to thermowell tip diameter. Vortices form in this wake, and shed from alternate sides of the well. When fluid flows past a thermowell, the change in fluid momentum creates a turbulent wake behind the well. Safe working pressures depend on the well material, operating temperature and the velocity of the flowing medium. Thermowells are machined from solid barstock. They are also used for isolation, so a sensor can be replaced without having to shut down the process. ![]() Thermowells are principally used with Thermocouples, RTDs (Resistance Temperature Detectors) and Bimetal Thermometers in applications where it is necessary to measure temperature at high pressure (above 75 psig) or in hostile environments. If the wake frequency coincides with the natural frequency of the thermowell, the well will vibrate and it leads to destruction. The wake has a specific frequency, which is a function of the diameter of the thermowell and the fluid velocity. The fluid will form a wake, known as a “Von Karman Trail”. What is a Thermowell Wake Frequency Calculation?Ī Wake Frequency Calculation is used to determine or prove the required dimensions and suitability of a Thermowell based on the process conditions. ![]()
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