Skip to Main content Skip to Navigation
Journal articles

Response of wall hot-film gages with longitudinal diffusion and conduction to the substrate

Abstract : The effects of heat transfer into a substrate and axial diffusion are analyzed through numerical simulations in order to elucidate the frequency response of wall hot-film gages. The ratio of the conductivities of the substrate and fluid plays an important role in steady flows when it is larger than 5 and the Péclet number is smaller than 50. The equivalent film length increases considerably with the conductivity ratio, and it decreases when a thin film of low conductivity is sandwiched between the hot-film gage and the substrate, showing a net improvement of the heat transfer conditions. The frequency response in unsteady flows is highly attenuated in the presence of heat transfer into the substrate. The cutoff frequency is strongly dependent on the conductivity ratio. Improved response is obtained with the two-layer substrate configuration. It is further shown that axial diffusion considerably affects the frequency response when the shear and/or the streamwise length of the film are small.
Complete list of metadatas

Cited literature [19 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00262010
Contributor : Legi Correspondant Hal 2 <>
Submitted on : Tuesday, February 25, 2020 - 12:17:21 AM
Last modification on : Thursday, February 27, 2020 - 1:30:56 AM

File

Tardu2005.pdf
Files produced by the author(s)

Identifiers

Collections

UGA | CNRS | LEGI

Citation

Sedat F. Tardu, C.Thanh Pham. Response of wall hot-film gages with longitudinal diffusion and conduction to the substrate. Journal of Heat Transfer, American Society of Mechanical Engineers, 2005, 127, pp.812-819. ⟨10.1115/1.1928907⟩. ⟨hal-00262010⟩

Share

Metrics

Record views

144

Files downloads

46