The dynamic response of the conicalhyphen;tip thinhyphen;film thermometer has been investigated through both experiments and numerical simulation. The numerical model extends the theoretical basis for the response from the simplified stagnationhyphen;region analysis to the cone geometry within the laminar flow regime, while taking into account the coupled thermal response of the fluid and the solid body. The experimental measurements, particularly the velocity scaling behavior, present useful information in their own right in addition to providing a check on the behavior of the model. This work confirms the shape of the dynamic response function and a velocityhyphen;independent spatial frequency response, a characteristic of the stagnationhyphen;region theory and an observed feature of hemisphericalhyphen;tip probes. Previous authors have reported an empirically derived velocity dependence for the conicalhyphen;tip sensor. In light of the work reported here, the validity of such empirical relationships must be seriously questioned.
展开▼
