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A lot of experimental research has been done to two kinds of new oil coolers using the pin-fin tube as the heat transfer elements, of which one form is longitudinal flow and the other one is crosswise flow . It was found that the heat transfer coefficient of the former one is 2.2 times as big as that of the latter one when the flow rate is (0.5kg/s) and the number of tubes is the same. The results...
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