Thermofluiddynamic experiments with a heated and rotating circular cylinder in crossflow |
| |
Authors: | H Peller D Straub |
| |
Institution: | (1) Universität der Bundeswehr München, Fakultät für Luft- und Raumfahrttechnik, Werner-Heisenberg-Weg 39, D-8014 Neubiberg, F.R. Germany |
| |
Abstract: | Two-dimensional flow fields and temperature boundary layer profiles around a heated and rotating circular cylinder in crossflow were experimentally investigated for a subcritical freestream-Reynolds-number 5.6 · 104 corresponding to a flow velocity of 7 m/s. Test parameter was the ratio of free stream velocity to peripheral speed, which encompasses the range between zero and 2.5. An electronically-controlled hot wire measurement technique, practicable for the requirements of 1–2 mm boundary layer thickness, was used. The numerous reliable test results confirm previous reported experiments. Characteristic features in heat transfer are discussed.List of symbols
C
b
correction factor for blockage
-
n
rotation rate in rpm
-
r
radial coordinate
-
R
cylinder radius
-
Re
Reynolds-number = U
2R/v
-
Re
R
circumferential Reynolds-number = U
R 2R/v
-
T
local temperature
-
U
velocity
-
= U
· C
b/U
R
velocity ratio of air flow and cylinder surface, corrected for blockage
-
v
kinematic viscosity
-
= T — T
/T
w — T
non-dimensional temperature
Indices
undisturbed flow conditions
-
w
wall
-
R
circumferential
-
c
critical
Dedicated to Alfred Walz on the occasion of his 80th birthday |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|