RT Journal Article
SR Electronic
A1 Čarnogurská, Mária
A1 Příhoda, Miroslav
A1 Lázár, Marián
T1 Theoretical and Experimental Determination of a Velocity Profile under Turbulent Air Flow in Pipework
JF Manufacturing Technology Journal
YR 2015
VO 15
IS 5
SP 777
OP 781
DO 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/777
UL https://journalmt.com/artkey/mft-201505-0005.php
AB The paper experimentally and theoretically analyses the velocity profile of air in laboratory stand pipework. Flow velocities measured using a hot-wire anemometer and a vane anemometer were compared with the results of numerical simulation. The k-ε turbulence model was used in the numerical solution of flow rates and for determining the velocity profile using the ANSYS_CFX program. Using power law, this profile was described via an analytical function. Velocities determined by measuring with both instruments in the investigated place in the pipework showed lower values in comparison with the numerical solution. The cause of the difference in velocities was probably inaccurate stating of the volume flow of air through the ultrasonic anemometer. Measurements and simulation showed slight asymmetry in velocity which is related to an insufficiently large volume of the equalisation chamber and the mutual position of the input and output openings.