Abstract
Turbulent structure measurements made in fully-developed mercury ( Pr = 0.024) pipe flow at Re = 100000 in isothermal and in nonisothermal flow subject to a constant wall heat flux of 23.3 kW m −2 are reported. An especially-built three-sensor hot-film probe was used to simultaneously measure the axial and radial velocity fluctuations and temperature fluctuations. Auto- and cross-spectral densities were measured to investigate differences in heat and momentum transport in low-Prandtl number flows. Microscales were calculated. The microscale ratio of temperature to that of velocity in the axial and radial directions was found to increase significantly near the wall whereas the lateral ratio tended to decrease slightly. In all cases the temperature microscale was larger than the corresponding velocity scale. The microscale results are related to the k- ε level of turbulence modeling.
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