PPT Slide
- Empirical relationship – to relate convective heat transfer to the induced shear stress
- Uses boundary layer approximation
- Assumes that the thermal BL lies within the linear region of velocity BL
- Sensing element lies on a semi-infinite substrate
- Thermal inertia - limits the usable bandwidth of the sensor
- Frequency dependent heat conduction into the substrate causes a low frequency roll- off in the gain factor of the FRF & phase lag
- Multiple input / single output system
Response of a shear-stress sensor is a function of temperature, shear stress, heat-conduction into the supporting substrate, thermal overheat ratio and maybe pressure