{"title":"Assessment of the wall shear stress measurement with arrayed micro hot-film sensors in a turbulent channel flow","authors":"T. Yoshino, Yuji Suzuki, N. Kasagi, S. Kamiunten","doi":"10.1615/tsfp2.990","DOIUrl":null,"url":null,"abstract":"Arrayed micro hot-film sensors for the measurement of the streamwise and spanwise wall shear stresses were developed and evaluated in a turbulent channel flow. The bandwidth of the sensor is found to be much narrower than previous estimates in the literature. A numerical analysis of the unsteady thermal field around the sensor chip is made in order to obtain a clue to design a hot-film shear stress sensor having higher frequency response. It is found that the phase lag of the thermal boundary layer above the hot-film and the indirect convective heat transfer through the diaphragm are responsible for the deteriorated sensor response.","PeriodicalId":438618,"journal":{"name":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","volume":"49 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"14","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceeding of Second Symposium on Turbulence and Shear Flow Phenomena","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1615/tsfp2.990","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 14
Abstract
Arrayed micro hot-film sensors for the measurement of the streamwise and spanwise wall shear stresses were developed and evaluated in a turbulent channel flow. The bandwidth of the sensor is found to be much narrower than previous estimates in the literature. A numerical analysis of the unsteady thermal field around the sensor chip is made in order to obtain a clue to design a hot-film shear stress sensor having higher frequency response. It is found that the phase lag of the thermal boundary layer above the hot-film and the indirect convective heat transfer through the diaphragm are responsible for the deteriorated sensor response.
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