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Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

Institutional price:	$586.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2007, Volume14

93 pages

DOI: 10.1615/JFlowVisImageProc.v14.i3

Issue price - $163.00

NUMERICAL ANALYSIS ON THE MIXING PERFORMANCE OF A NOVEL EFFUSION-TYPE MICROMIXER

Fuh-Lin Lih
School of Defense Science Studies, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan 335, R.O.C

Tsung-Sheng Sheu
Department of Mechanical Engineering, Chinese Military Academy, Kaohsiung, Taiwan 830, R.O.C.

Jr-Ming Miao
Department of Mechatronic, Energy and Aerospace Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan 335, R.O.C.

ABSTRACT

A numerical approach to the mixing characteristics of a novel effusion-type micromixer was performed in the present study. The investigations of the effects of effusion tube's height, shape of the effusion hole as well as the arrangement of effusion tubes on the mixing efficiency within microchannels were systematically conducted using the CFD technique. Five different types of the effusion hole — a straight circular shape, square shape, diamond shape, and two different aspect ratios of an ellipse shape — were considered to evaluate the maximum mixing performance for triple divisions of a micromixer under flow conditions of the Peclet number (Pe) as 100, 200, and 400. The results showed that nearly complete mixing of two miscible liquids can be achieved by including effusion-tube structures in the middle part of the sandwich microchannels of the micromixer. Results revealed an improvement in mixing efficiency when the interfacial surface between two working fluids is obviously widened by the present effusion hole design, and suitable arrangement of the effusion tubes is important for improving the mixing efficiency. The results also showed the excellent mixing efficiency of over 80% after the solutions passed through a 2-mm-long micro-channel at Pe = 100. The proposed novel design of a passive effusion-type micromixer can be applied in μ-TAS.