Experimental investigation demonstrates disturbance waves in shear-driven liquid flow, suggesting implications for interfacial dynamics.
This study investigated the behavior of disturbance waves in shear-driven liquid film flow under non-heated conditions in a rectangular channel. Experiments were conducted to evaluate the liquid film thickness of the shear-driven liquid film flow at different gas Reynolds number using a laser displacement sensor. Simultaneously, the liquid film behavior from the top view was observed using a high-speed video camera. The time series data of the film thickness were analyzed using Fast Fourier Transform (FFT) to evaluate the frequency characteristics of the gas-liquid interfacial behavior. The results showed that disturbance waves appeared when the gas Reynolds number exceeded 6161, at which point annular flow was observed. Furthermore, with increasing gas Reynolds number, the fluctuation of the gas-liquid interface increased, and the dominant frequency shifted toward higher values. These findings demonstrate the effectiveness of FFT analysis in capturing the dynamic characteristics of disturbance waves in shear-driven liquid film flow, contributing to a deeper understanding of interfacial wave behavior under non-heated conditions.
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NISHI et al. (2025) studied this question.
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