Numerical investigation into the effect of viscosity on bubble dynamics in a narrow channel

In this paper, dynamic behavior of a vapor bubble inside a narrow channel filled with a viscous liquid is numerically studied. The boundary integral equation method and the procedure of Viscous Correction of Viscous Potential Flow (VCVPF) were employed to obtain the vapor bubble profiles during pulsations inside a narrow channel filled with a viscous liquid. A new method was adopted to consider the effects of viscosity in a viscous liquid flow within the framework of the Green's integral formula together with the modified form of unsteady Bernoulli equation. The reported experimental and numerical results for the problem under investigation were used in the verification of the results of the present work. Numerical results showed that by increasing the viscosity of liquid around the vapor bubble, bubble lifetime increased. They also indicated that for Reynolds numbers with the order of O(10(3)), the viscosity effects were extremely reduced. Furthermore, dynamic behavior of bubble in water and oil was investigated at different Reynolds numbers and at different so-called dimensionless channel radii. (C) 2020 Sharif University of Technology. All rights reserved.