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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

2001, Volume8

110 pages

Issue price - $280.00

FLUCTUATING COMPONENT DECOMPOSITION OF CONDENSATION JET IMAGE USING WAVELETS

Kiyoshi Horii
Shirayuri College, 1-25 Midorigaoka, Chofu-shi, Tokyo 182-8525, JAPAN

Yoshifuru Saito
Department of Electrical and Electronic Engineering, College of Technology, Hosei University, Tokyo, Japan

Motoaki Kimura
Department of Mechanical Engineering, College of Science and Technology, Nihon University, 1-8, Kanda Surugadai, Chiyodaku, Tokyo 101-8308, Japan

Masahiro Takei
Department of Mechanical Engineering, College of Science and Technology, Nihon University, 1-8, Kanda Surugadai, Chiyodaku, Tokyo 101-8308, Japan

Atushi Saima
Department of Mechanical Engineering, College of Science and Technology, Nihon University, 1-8, Kanda Surugadai, Chiyodaku, Tokyo 101-8308, Japan

Karen Vierow
School of Nuclear Engineering, Purdue University, West Lafayette, Indiana, United States

ABSTRACT

This paper describes the application of discrete wavelet transforms to the analysis of condensation jets in order to clarify the associated fluid and heat transfer phenomena. An experimentally obtained, two-dimensional image of the condensation particle density around the jet was decomposed into seven levels of resolution with their respective wavelengths. Based on the known physical characteristics of turbulent flow around the jet, levels 0 and 1 were shown to represent the steady components of the condensation particle density, and the higher levels represent the fluctuating components. From the analysis images, the width of the condensation zone was obtained and this compared well with the width inferred from temperature measurements. Thus, the method was verified and also provided data not available experimentally.