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International Heat Transfer Conference 7

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

HEAT TRANSFER IN TWO-COMPONENT MIST FLOW : BOUNDARY LAYER STRUCTURE ON AN ISOTHERMAL PLATE

Koichi Hishida
Department of System Design Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522

Masanobu Maeda
Dept. of System Design Engineering, Keio University, 3-14-1 Hiyoshi Kohoku-ku, Yokohama, 223-8522

Shigeru Ikai
Keio University, Kohoku, Yokohama, Japan

DOI: 10.1615/IHTC7.4570
pages 301-306

Abstract

The boundary layer structure of a two-component (water-air) mist flow on a dry isothermal plate has been experimentally investigated for lower water-air mass flow ratios. The distributions of gas and droplets velocities, droplet sizes and number densities of droplets in the boundary layer are simultaneously measured by a modified laser Doppler anemometer. The optical measurements indicate that the gas velocity in the boundary layer of a mist flow is unchanged even in the presence of droplets in a dilute concentration, and that the relative velocity between droplets and gas phase near the wall in the boundary layer increases with an increasing attack angle over the leading parts of the plate. The mean diameter of droplets increases near the wall in the boundary layer at higher wall temperatures, smaller attack angles and/or lower free stream velocities. The characteristics of the enhancement of heat transfer coefficients with an increase in the attack angle and the free stream velocity can be related to the dispersed phase behaviours in the boundary layer.

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