TUBE FOR A HEAT EXCHANGER AND METHOD OF MAKING THE TUBE
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United States of America Patent
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Issued Date -
Jun 25, 2020
app pub date -
Dec 19, 2018
filing date -
Dec 19, 2018
priority date (Note) -
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Abstract
A tube for a heat exchanger core bears a micro texture imprinted on an outer surface of the tube. The micro texture having depth of 0.01 mm to 0.03 mm and is thus hardly visible by a naked eye. When the tube is made of cladded metal strip material, the micro texture may have a depth that may be slightly greater than the thickness of the cladding. For folded tubes, an entire strip surface may be covered with the micro texture so that micro texture is present on the outer surface of tube and inside tube. Alternatively, the micro texture may be imprinted after forming the tube so that the micro texture is only present on the outer surface of the tube.
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