Vibrational Heat Transfer Intensification in an Annulus with a Deformable Boundary

Abstract

An experimental study is carried out on heat transfer in a horizontal liquid annulus at boundary oscillations. The inner boundary is formed by a copper rod that is heated using electric current. The outer boundary is made of an elastic silicone tube brought to oscillations by two electrodynamic vibrators situated symmetrically on the opposite sides. In the absence of vibrations, a classic natural convection is observed. Vibrations excite steady time-average flows in the fluid. The steady flows make the gravity-induced flow structure transform, and the heat transfer is intensified. In the analysis, it is shown that the heat transfer in the studied system is determined by a competition between the natural convection and steady streaming. A domain of parameters is found where the latter dominates.

Vibroconvective heat transfer in cylindrical container with oscillating elastic boundaries

“…In recent works [4,5,6], it was shown that flows in a drop can be modeled in a relatively large cylindrical container. In [5,6], a study of heat transfer in a horizontal annular region filled with a viscous fluid was carried out.…”

“…In recent works [4,5,6], it was shown that flows in a drop can be modeled in a relatively large cylindrical container. In [5,6], a study of heat transfer in a horizontal annular region filled with a viscous fluid was carried out. In this case, the inner boundary was a heater, and the outer elastic boundary was set in oscillations and maintained at a constant temperature.…”

“…. In [6], the mechanisms of heat transfer were considered: convection induced by oscillations, thermal vibrational convection, and free gravitational convection. The dependencies ( ), are analyzed.…”

“…In this work, which is a continuation of [6], the vibroconvective heat transfer in the horizontal annular region is experimentally studied at a low heating power (0.9 W) at different intensities of vibrations.…”