Author(s)

W. Schreiber

Abstract

A mathematical model that uses an adaptive mesh for predicting scalar transport in a transient incompressible jet W. Schreiber Department of Mechanical Engineering, University of Alabama, USA Abstract This paper describes a mathematical model for fluid flow and scalar transport in the impulsively started jet. The motivation of the work is the goal of developing a model for a diffusion flame found in the compression-ignited, direct injection (CIDI) engine. The mathematical model in this paper describes the transient jet's hydraulic structure using a combination of closed-form equations for two flow structures, a quasi steady state jet and a steady state spherical vortex. Numerical methods are employed to couple the two flow structures as well as to extend them to transient. The resulting hydrodynamic model is used in a numerically-based model for predicting the entrainment and transport of a scalar (either mass or heat) in the transient jet. Fluid flow in the jet is assumed quasisteady and take

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