THE EFFECT OF FRESHWATER BIOFILMS ON SKIN FRICTION DRAG
A study is underway at the University of Tasmania, in partnership with Hydro Tasmania, to investigate the skin friction drag generated by different surfaces, including smooth, rough and biologically fouled surfaces. A purpose built recirculating water tunnel has been developed to allow the detailed measurement of boundary layer flow over a variety of surfaces. Mean velocity boundary layer profiles and turbulence intensity profiles are measured using Laser Doppler Velocimetry (LDV) to determine local skin friction coefficients and boundary layer parameters in an attempt to better understand the mechanisms of drag production. An artificial biofilm was developed consisting of wool strands glued to a smooth surface in a regular 100 mm grid with the aim to mimic filamentous algae streamers observed in hydroelectric power system canals. Results were compared with a smooth painted reference plate. Measurements directly downstream of a streamer showed elevated streamwise turbulence intensity in the vicinity of the streamer motion path. No significant difference in local skin friction coefficient was measured between the artificial biofiim and the smooth plate.
biofilm boundary layer drag streamer turbulence
Jessica Andrewartha Jane Sargison Alan Henderson Kate Perkins Greg Walker
School of Engineering, University of Tasmania, Australia School of Plant Science, University of Tasmania, Australia
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
1940-1945
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）