Assessment of uncertainties in hot-wire anemometry and oil-film interferometry measurements for wall-bounded turbulent flows
نویسندگان
چکیده
منابع مشابه
Hot-wire anemometry for superfluid turbulent coflows.
We report the first evidence of an enhancement of the heat transfer from a heated wire to an external turbulent coflow of superfluid helium. We used a standard Pt-Rh hot-wire anemometer and overheat it up to 21 K in a pressurized liquid helium turbulent round jet at temperatures between 1.9 K and 2.12 K. The null-velocity response of the sensor can be satisfactorily modeled by the counterflow m...
متن کاملSpatial resolution correction for hot-wire anemometry in wall turbulence
We investigate spatial resolution issues in hot-wire anemometry measurements of turbulence intensity and energy spectra. Single normal hot-wire measurements are simulated by means of filtering direct numerical simulation (DNS) of turbulent channel flow at Res 1⁄4 934. Through analysis of the two-dimensional energy spectra from the DNS, the attenuation of the small-scale energy levels is documen...
متن کاملThe Influence of Spatial Resolution due to Hot-Wire Sensors on Measurements in Wall-Bounded Turbulence
Reassessment of compiled data reveal that recorded scatter in the hot-wire measured near-wall peak in viscous-scaled streamwise turbulence intensity is due in large part to the simultaneous competing effects of Reynolds number and viscous-scaled wire-length l ( lUτ ν, where l is the wirelength, Uτ is friction velocity and ν is kinematic viscosity). These competing factors can explain much of th...
متن کاملHot-wire spatial resolution issues in wall-bounded turbulence
N. HUTCHINS, T. B. NICKELS, I. MARUSIC and M. S. CHONG Journal of Fluid Mechanics / Volume 635 / September 2009, pp 103 136 DOI: 10.1017/S0022112009007721, Published online: 10 September 2009 Link to this article: http://journals.cambridge.org/abstract_S0022112009007721 How to cite this article: N. HUTCHINS, T. B. NICKELS, I. MARUSIC and M. S. CHONG (2009). Hotwire spatial resolution issues ...
متن کاملWeak Dirichlet Boundary Conditions for Wall-Bounded Turbulent Flows
In turbulence applications, strongly imposed no-slip conditions often lead to inaccurate mean flow quantities for coarse boundary-layer meshes. To circumvent this shortcoming, weakly imposed Dirichlet boundary conditions for fluid dynamics were recently introduced in [4]. In the present work, we propose a modification of the original weak boundary condition formulation that consistently incorpo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: European Journal of Mechanics - B/Fluids
سال: 2018
ISSN: 0997-7546
DOI: 10.1016/j.euromechflu.2018.04.012