Oblique fine-rib and flat heat-transfer pipe
A technology of heat transfer tubes and flat tubes, which is applied in the field of heat exchange elements, can solve problems such as increased resistance loss, and achieve the effects of improved heat transfer coefficient, enhanced heat transfer, and stable heat transfer performance
Inactive Publication Date: 2009-03-11
HARBIN ENG UNIV
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Problems solved by technology
These two heat transfer tubes can significantly increase the heat transfer coefficient in the tube, but at the same time, it will also be accompanied by a large increase in resistance loss.
Method used
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[0019] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0020] Such as figure 1 and figure 2 , The oblique micro-rib flat heat transfer tube consists of a flat tube body 1 and dense oblique micro-ribs 2 . Wherein, the flat tube main body is composed of two opposite straight surfaces 3, 4 and two opposite semi-arc surfaces 5, 6, and the flat surfaces 3, 4 and semi-arc surfaces 5, 6 are connected tangentially. The straight surfaces 3 and 4 are the main heat exchange surfaces of the heat transfer tubes, and the included angles between the micro-ribs 7 and 8 on the two opposite planes and the axis of the heat transfer tubes are equal in size and opposite in direction, forming a "V" cross. The inclination angle between the micro-rib on the plane inner wall where the straight long side is located and the axis of the flat tube is θ=18-45 degrees. The height of the micro-ribs is 0.2-0.5 mm, and the pitch is 0.6-2.4 mm. Th...
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Abstract
The invention provides an inclined micro-rib flat heat exchanger tube, comprising a flat tube; the section of the flat tube is composed of two opposite flat, straight long edges and two opposite semicircular arc short edges; the inner wall of the plane of the flat, straight long edges is provided with dense micro ribs which have a certain inclined angle with the axial line of the flat tube; and the angles of the micro ribs of the two opposite flat, straight long edges and the axial line of the flat pipe have equal degree and opposite direction and are crossed with the shape of V. Compared with the prior art, the invention improves 200 percent to 260 percent than a common circular tube, 15 percent to 30 percent than a circular micro rib tube and 25 percent to 60 percent than a smooth and flat tube. The increased amplitude of the flow resistance is lower than the increased amplitude of heat exchange; the reinforcing heat exchange performance in a turbulent region is very stable, and the reduced amplitude of the reinforcement ratio is small with the increase of reynolds number, therefore, the inclined micro-rib flat heat exchanger tube is particularly applicable to the reinforcing heat exchange in high reynolds number regions.
Description
(1) Technical field [0001] The invention relates to a heat exchange element, in particular to an enhanced heat exchange tube. (2) Background technology [0002] Since the global energy crisis in the early 1970s, enhanced heat transfer technology has achieved rapid development. For decades, people have conducted a lot of theoretical and experimental research, developed various forms of enhanced heat transfer technology, and applied in many fields be widely used. For example, the flat tube makes use of its large cross-sectional aspect ratio to greatly increase the velocity gradient of the fluid in the tube near the wall, thereby significantly increasing the convective heat transfer coefficient in the tube. The processing technology of the flat tube is very simple, and the heat exchanger made of this tube has a much larger volume heat exchange area than the ordinary shell-and-tube heat exchanger, thus further improving the compactness and volume heat transfer rate of the heat ...
Claims
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Inventor 孙中宁阎昌琪范广铭
Owner HARBIN ENG UNIV