This paper presents the visualization of periodic reverse flow in tubes of an automobile microchannel evaporator. Two microchannel tubes in an off-the-shelf evaporator are modified so that the leading edges are transparent and the rest of the area remains unchanged, providing realistic air heating. Flow visualizations in air heated aluminum tubes and electric heating glass tube are compared and similar flow physics is identified. A mechanistic model of flow reversal is developed. The model is capable of simulating bubble generation, growth coalescence and reverse. The validation against experimental visualization is on the way.
Visualization and Analysis of Periodic Reverse Flow in an Automobile Microchannel Evaporator
Sae Technical Papers
SAE 2016 World Congress and Exhibition ; 2016
2016-04-05
Conference paper
English
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