Discontinuous double oblique crossing rib strengthened heat exchange method between flat-plates

A technology of strengthening heat exchange and plate heat exchanger, which is applied in indirect heat exchangers, heat exchanger types, fixed plate conduit components, etc., can solve the problems of strengthening heat exchange and increasing flow resistance at the same time, and achieve good anti-fouling effect. , The effect of strengthening heat transfer is remarkable, and the molding is simple.

Inactive Publication Date: 2009-05-06
TSINGHUA UNIV
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Problems solved by technology

[0005] In view of the current process of enhanced convective heat transfer between flat plates, the flow resistance increases too much while heat transfer is enhanced, based on the "field synergy principle", this invention proposes a method f

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  • Discontinuous double oblique crossing rib strengthened heat exchange method between flat-plates
  • Discontinuous double oblique crossing rib strengthened heat exchange method between flat-plates
  • Discontinuous double oblique crossing rib strengthened heat exchange method between flat-plates

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Embodiment Construction

[0024] According to the field synergy theory of convective heat transfer, the multi-longitudinal vortex has excellent flow characteristics and enhanced heat transfer, especially in laminar flow and low Reynolds number of Re≤10000, its comprehensive enhanced heat transfer performance is more prominent. The fin spacing of finned tubes is generally relatively small, and the Reynolds number of the flow between the fins is generally less than 2000; due to the compactness of the plate heat exchanger, the channel between the plates is relatively narrow, so the Reynolds number of the flow between the plates of the plate heat exchanger is generally Less than 10000. Therefore, the inter-fin heat transfer of finned tubes and the inter-plate heat transfer of plate heat exchangers belong to low Reynolds number convective heat transfer. The discontinuous double oblique intersecting ribs between the flat plates of the present invention can generate multiple longitudinal vortices in the fluid...

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Abstract

The invention discloses a method for reinforcing heat convection between flat plates by incontinuous array diclinic diagonal ribs, which belongs to the technical field of heat convection between rib reinforced flat plates. The technical proposal of the method is that a series of incontinuous prismatic ribs which have certain included angles with the flow directions of fluid between the flat plates and inclines towards two directions are arranged on surfaces of the flat plates involved in the heat convection; protrusions and debosses are formed on two sides of the flat plate surface respectively; and the ribs on the adjacent flat plates are arranged crossly along the surfaces of the flat plates vertically, so as to form arrayed incontinous diclinic diagonal ribs. The method has the advantages of obvious function of reinforcing heat transfer, smaller flow resistance, and simple mould, and better scale resistance function; and compared with the prior art for reinforcing heat exchange fins/plates, the method also has the advantages of low processing and manufacturing cost, good applicability, and the like.

Description

technical field [0001] The invention belongs to the technical field of rib-enhanced convective heat transfer between flat plates, and in particular relates to a method for enhancing convective heat transfer between flat plates by using an array of discontinuous double oblique cross ribs. Background technique [0002] Convective heat transfer between plates is an important form of heat exchange, such as the fins of finned tube heat exchangers, the plates of plate heat exchangers, etc. application. [0003] For finned tubes, the cold and hot fluids have cross-flow heat exchange between the walls. The inside of the tube is a single-phase or phase-change fluid, and the outside of the tube is generally air, flue gas and other gaseous media. Since the heat transfer resistance of the gas outside the tube of the finned tube heat exchanger occupies a large proportion in the entire thermal resistance, and the difference in fin structure and geometric size plays a decisive role in its...

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Application Information

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IPC IPC(8): F28D9/00
Inventor 孟继安宋伟明李晓伟李志信
Owner TSINGHUA UNIV
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