Abstract
In this study, the theoretical and experimental study of a cross-flow heat exchanger is carried out based on the theory of porous media under low Reynolds number. The accuracy of the mathematical calculation model is verified by experiments. Pressure drop in air side and efficiency of heat exchanger are analyzed with mathematical models of various non-uniform air flows under low Reynolds number. The responses are found influences of air flow non-uniformity on pressure drop and efficiency of heat exchanger have certain rules. The difference in pressure drops between non-uniform air flows and evenly distributed air flows is linearly related to variance [Formula: see text] of non-uniformity. And the increasing rate of resistance energy consumption difference between non-uniform air flows and evenly distributed air flows is approximately linearly related to the relatively non-uniform coefficient squared [Formula: see text] of non-uniformity. The descent range of heat transfer efficiency has exponential relation to the relatively non-uniform coefficient [Formula: see text].
Highlights
With the increasingly stringent vehicle-emission regulations and miniaturization and module of new engine design, the power density and energy efficiency of engines have changed
For improving the efficiency of heat exchanging, various different fin structures have been applied to heat exchangers
Many studies suggest that air-side resistance and heat transfer performance of heat exchanger are strongly influenced by fin structure, fin pitch, and number of tube rows
Summary
With the increasingly stringent vehicle-emission regulations and miniaturization and module of new engine design, the power density and energy efficiency of engines have changed. Cross-flow heat exchangers, as the key components in cooling systems, are widely used in vehicles, such as radiator, intercooler, and condenser, owing to their traditional advantages, which contain compactness, lightness, high efficiency, and so on.[1]. As the demand for reducing the size and weight of vehicles continues to grow, smaller and lighter crossflow heat exchangers have been studied. For improving the efficiency of heat exchanging, various different fin structures have been applied to heat exchangers. Many studies suggest that air-side resistance and heat transfer performance of heat exchanger are strongly influenced by fin structure, fin pitch, and number of tube rows. Dong[2] and Dong and Chen[3] studied in detail various types and sizes of cross-flow
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