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INSTANTANEOUS MASS TRANSFER MEASUREMENT AND ITS RELATION TO TURBULENCE STRUCTURES IN PIPE FLOW

Tong Tong
Department of Energy Engineering and Science Graduate School of Engineering Nagoya University Furo-cho, Chikusa-ku, Nagoya, Japan 464-8601

Hironori Ito
Department of Energy Engineering and Science Graduate School of Engineering Nagoya University Furo-cho, Chikusa-ku, Nagoya, Japan 464-8601

Takahiro Ito
Department of Energy Engineering and Science Graduate School of Engineering Nagoya University Furo-cho, Chikusa-ku, Nagoya, Japan 464-8601

Yoshiyuki Tsuji
KTH Mechanics, Royal Institute of Technology, 100 44 Stockholm, Sweden; Department of Energy Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8503, Japan

Abstract

In turbulent pipe flow, large-scale structures occur over a wide range of length and time scales, whose length is estimated to be of the order of 20R, where R is the pipe radius (Hutchins and Marusic, 2007) and may persist over long periods of time. Due to such largescale events maintain a footprint in the near-wall region, some studies have revealed the relation between large-scale structure and shear stress (Hutchins and Marusic, 2007). However, since the mass transfer can be correlated with momentum by the analogy between both transport phenomena, we believe the large-scale events will also affect the mass transfer rate. In this study, we will focus on effects from large-scale structures on the mass transfer rate through a simultaneous measurement of mass transfer rate and velocity field.