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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

An Improved Convective Heat Transfer Model for Multidimensional Engine Flow Calculations

Get access (open in a dialog) DOI: 10.1615/IHTC12.3460
6 pages

Abstract

In-cylinder heat transfer plays an important role in the development of optimum design configurations for all types of internal combustion engines. It interacts strongly with most of the fundamental in-cylinder processes and directly affects the power output and thermal efficiency of the engine.
The new model presented in this paper includes both the effects of the turbulent flow field and heat radiation physics on the instantaneous heat transfer. It calculates model the convective heat transfer coefficient by using the empirical correlation for flow over a flat, isothermal plate [Cebeci and Bradshaw, 1988].
The law of the wall has been widely used as a standard model for the wall boundary conditions in CFD codes, though it has been designed for steady turbulent boundary layers without exothermic reactions. Therefore, the present study aims at developing a heat transfer model which uses the one-dimensional energy equation instead.
The heat transfer model has been successfully verified by the comparison to measured wall heat fluxes in a single-cylinder direct injection diesel engine.