A computational study on the flow characteristics of a self-compensating liquid balancer

• Published in: Journal of mechanical science and technology Vol. 25; no. 6; pp. 1465 - 1474
• Main Authors: Jung, Chung-Hyo, Kim, Jin-Tak, Choi, Yun-Ho
• Format: Journal Article
• Language: English
• Published: Heidelberg Korean Society of Mechanical Engineers 01.06.2011; Springer Nature B.V; 대한기계학회
• Subjects: Balancing; Computational fluid dynamics; Control; Dynamical Systems; Electric appliances; Engineering; Flow characteristics; Industrial and Production Engineering; Liquids; Mathematical models; Mechanical Engineering; Rigid-body dynamics; Vibration; Washing machines; 기계공학; CFD; Eccentricity; Automatic washing machine; Restoration force; Liquid balancer; Centrifugal force; Free surface; Dynamic model; VOF; Baffle
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-011-0407-y

An automatic washing machine undergoes rotational unbalance due to unbalanced mass during the spinning process. A liquid balancer is an assembly that plays a role in controlling this unbalance. In recent years, washing machines (drum and automatic types) are becoming larger to handle large laundry items such as comforters. A large-sized washing machine generates a huge centrifugal force in its high speed rotating drum. Thus, a specific vibration reduction technique is required. The design of a liquid balancer has, to date, depended on conventional methods such as experiments and dynamic models. A dynamic model classifies the behavior of liquid inside the balancer into three different patterns, and solutions can be obtained by approximating these patterns as rigid bodies. This method, however, is limited to two-dimensional (2-D) analysis for simple geometry. In the present study, a three dimensional (3-D) computational fluid dynamics (CFD) method is used to analyze flow characteristics inside the liquid balancer for various design parameters. The main parameters include rotational speed, eccentricities of the center of rotation, viscosity of the liquid, gravity orientation, surface tension, and the number of baffles. In particular, the effects of these parameters on the hydraulic force (restoration force) of the liquid balancer are studied.