A numerical study of temperature effects on hot wire measurements inside turbulent channel flows

Malizia, Fabio (2013) A numerical study of temperature effects on hot wire measurements inside turbulent channel flows. [Laurea magistrale], Università di Bologna, Corso di Studio in Ingegneria aerospaziale [LM-DM270] - Forli'
Documenti full-text disponibili:
Documento PDF
Download (1MB) | Anteprima


A way to investigate turbulence is through experiments where hot wire measurements are performed. Analysis of the in turbulence of a temperature gradient on hot wire measurements is the aim of this thesis work. Actually - to author's knowledge - this investigation is the first attempt to document, understand and ultimately correct the effect of temperature gradients on turbulence statistics. However a numerical approach is used since instantaneous temperature and streamwise velocity fields are required to evaluate this effect. A channel flow simulation at Re_tau = 180 is analyzed to make a first evaluation of the amount of error introduced by temperature gradient inside the domain. Hot wire data field is obtained processing the numerical flow field through the application of a proper version of the King's law, which connect voltage, velocity and temperature. A drift in mean streamwise velocity profile and rms is observed when temperature correction is performed by means of centerline temperature. A correct mean velocity pro�le is achieved correcting temperature through its mean value at each wall normal position, but a not negligible error is still present into rms. The key point to correct properly the sensed velocity from the hot wire is the knowledge of the instantaneous temperature field. For this purpose three correction methods are proposed. At the end a numerical simulation at Re_tau =590 is also evaluated in order to confirm the results discussed earlier.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Malizia, Fabio
Relatore della tesi
Correlatore della tesi
Corso di studio
Ordinamento Cds
Parole chiave
Turbulence, Channel flow, Hot wire, Correction, Temperature, Simulation
Data di discussione della Tesi
21 Marzo 2013

Altri metadati

Statistica sui download

Gestione del documento: Visualizza il documento