Simulation analysis of bubble motion under ultrasonic assisted Electrical Discharge Machining

Abstract

Abstract. In order to reveal the machining mechanism of the inter electrode gap during ultrasonic assisted electrical discharge machining, the relationship between the distribution of the flow field and bubble motion was studied. The three-dimensional model of deep hole machining was established firstly using the GAMBIT software. On the basis of theoretical analysis on the gap of the flow field working liquid, the bubble motion in the process of multiple pulse discharge was simulated using the FLUENT software. The motion of a single bubble and bubbles under with and without ultrasound was simulated respectively. Compared with the simulation results without considering ultrasound, it can be obtained that ultrasonic vibration is helpful for the generation of bubbles and improvement in the machining efficiency. It is provided a simulation basis for the actual analysis of electrical discharge machining process and the optimization of machining parameters.

Comparative Experimental and Numerical Investigation on Electrical Discharge Drilling of AISI 304 using Circular and Elliptical Electrodes

“…Wang and Han [17] and [18] proposed a 3D model of flow field with liquid, gas, and solid phases to analyse the machining gap during electrode jump in EDM. The variations in bubble volume at the interelectrode gap in ultrasonically assisted EDM were studied by Kong et al [19]. The 3D geometrical modelling of the flow field at interelectrode gap was established using FLUENT software.…”

“…water as liquid phase, bubbles as gas phase, and debris as solid phase) in ANSYS FLUENT. The interaction between bubbles and water was simulated with a Euler-Euler VOF model [16] to [18] by solving the volume continuity equation as follows [19]:…”

Comparative experimental investigation and gap flow simulation in electrical discharge drilling using new electrode geometry

“…water as liquid phase, bubbles as gas phase, and debris as solid phase) in ANSYS FLUENT software. The interaction between bubbles and water was simulated with Euler-Euler VOF model (Xie et al, 2015a;Wang and Han, 2014a, b) by solving the volume continuity equation as follows (Kong et al, 2015):…”

“…When discharge occurs, the water starts being transferred into bubbles. Processing of the water volume fraction (α L ) was computed by the following equation (Kong et al, 2015):…”

“…Kong et al (2015). 3-D geometrical modeling of flow field at interelectrode gap was established using FLUENT software.…”