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Study of Transition from Laminar to Turbulent Boundary Layer on a Tilted Flat Plate Using Heat Transfer Measurements

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Journal of Thermal Science 2007年第2期16卷 186-191页

作者： E.Sanz C.Nicot R.Point F.Plaza Laboratoire de Mécanique des Fluides et Acoustique LMFA(ECL-UCB-INSA Lyon-CNRS)36Avenue Guy de Collongue69134 Ecully.France.

The boundary layer transition over a flat tilted plate has been studied by means of heat transfer measurements. A heat flux sensor has been developed, in order to measure the efficiency of convective heat transfer for various types of surfaces or flows. Its operation at constant temperature allows direct and fast measurements of heat flux. The present paper reports the development of the sensor and presents its application to the study of transition in a boundary layer depending on the angle of incidence of the external flow. An exponential relationship between critical Reynolds number and pressure gradient.parameter has been found.

关键词： convective heat flux boundary layer transition pressure gradient.

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Preliminary Statistics of Temperatures and pressures for Formation of Eclogites,Granulites and Peridotites in China

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Journal of China University of Geosciences 2004年第2期15卷 183-192页

作者： HuBaoqun WangFangzheng SunZhanxue LiuChengdong BaiLihong DepartmentofGeosciences EastChinaInstituteofTechnologyFuzhou344000China FacultyofEarthSciences ChinaUniversityofGeosciencesWuhan430074China

The rock forming temperatures and pressures represent the p T points of the local regions in the lithosphere at a certain age, providing some important information on rock formation. Based on the preliminary statistics on the temperatures and pressures for the formation of eclogites, granulites and peridotites in China, the variant ranges are given, in this paper, of temperatures, pressures and linear geothermal gradient. of eclogites, granulites and peridotites. In addition, since the eclogite is different from granulite and peridotite in the p T diagram, these three rocks can be classified into two groups: the first group includes eclogites and the second group granulites and peridotites. Then, the p T correlation functions of these two groups of rocks are provided. Finally, the two groups of rocks have different geothermal gradient. at the same pressure gradient.or have different pressure gradient. at the same geothermal gradient. The temperatures and pressures for the formation of the rocks can be calculated from the mineral chemical compositions, but the depths ( H ) for the rock formation can be calculated only under the hypotheses of given p H (or T H ) correlation functions. The explanations for the ultrahigh pressure metamorphism vary obviously with different hypotheses.

关键词： eclogite granulite peridotite temperature and pressure geothermal gradient pressure gradient.

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