• Original Article • 下一篇
毛卓雄1; THOMAS J. HANRATTY2
1 Institute of Chemical Metallurgy, Academia Sinica, Beijing
2 Dept. of Chemical Engineering, University of Illinois, U.S.A.
MAO Zhuoxiong1; THOMAS J. HANRATTY2
1 Institute of Chemical Metallurgy, Academia Sinica, Beijing
2 Dept. of Chemical Engineering, University of Illinois, U.S.A.
摘要: Measurement of turbulent fluctuations of vclocity gradient on the wall is important for thorough understanding of turbulence structure, mass transfer and heat transfer in the vicinity of the wall. This paper describes the principle of electrochemical technique as well as the measurement of two-dirnensional fluctuations of velocity gradient with a pair of semicircular electrodes. In a fully developed turbulent pipe flow with pipe diameter of 0.194 m and with a solution of iodine and potassium iodide as flow medium, the measured axial and transversal turbulent intensities of velocity gradient at the wall arc 0.3-0.33 and 0.11 0.12 respectively.