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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

DROPLET STREAM INTERFERENCE EFFECTS IN THE THERMAL AND HYDRODYNAMIC ENTRANCE REGION OF CIRCULAR DUCTS

Get access (open in a dialog) DOI: 10.1615/IHTC13.p12.220
12 pages

Abstract

Liquid spray atomization and vaporization is used in a wide variety of applications with industrial interest. The present paper studies the vaporization of isolated fuel droplets and linear arrays of fuel droplets in convective regimes inside cylindrical ducts under assumptions that allow comparisons with analytical solutions. The fuel droplets are positioned along the tube centerline allowing an axisymmetric analysis of the physical problem. For the gaseous phase, momentum, energy and species conservation equations are discretized using the Finite Difference Method. An implicit scheme is applied and the resulting system of algebraic equations is solved through iterative techniques with local error control. The discrete phase treatment makes use of vaporization models, avoiding numerical treatment of a non-regular domain. Results are obtained for laminar flow with different tube entrance conditions and number of droplets in the linear array. Limiting cases of isolated droplets and single-phase flows are used to validate and calibrate the developed numerical code. The analysis of the numerical results is focused on individual droplet vaporization rates, the fuel-air mixture at tube exit and on heat transfer parameters along the solid contours.