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Many years since ,the enhancement of the thermal heat transfer in different systems, where the air is used , had drawn the attention of many searchers .The air with its unfavorable thermo physical properties presents a low heat transfer coefficient . In spite of these mediocre characteristics . the air is widely used as fluid of heat transfer because other factors have been taken into account . These factors have the advantage of more large consideration than the thermal performances , which and oneself relegated to the background .When the air systems are employed for the needs of heating or drying, inexpensive materials are used and one does not fear the inopportune leaks of circuit like that encountered by using the water.
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