Device and method for enhancing flowing and mixing of fluid in closed cavity through natural convection
A natural convection, closed cavity technology, applied in the direction of fluid flow, sustainable biological treatment, sustainable construction, etc., can solve problems such as cavity wall openings and stress concentration in welds
Active Publication Date: 2021-10-29
BEIJING JIAOTONG UNIV
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Problems solved by technology
This poses a challenge to the cavity with high sealing requirements, and it is easy to cause stress concentration at the opening and welding of the cavity wall
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[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0031] Such as figure 1 As shown, a device that utilizes natural convection to enhance fluid flow and mixing in a closed cavity includes side walls surrounding a cavity 1, and cooling zones 2 and heating zones 3 are alternately arranged on the opposite side walls, respectively. In the horizontal direction, the cooling zone 2 on one side wall corresponds to the heating zone 3 on the other side wall, and the heating zone 3 on one side wall corresponds to the cooling zone 2 on the other side wall.
[0032] The corresponding heating zones in the horizontal direction are equal in size to the cooling zones. The cavity can be square or other shapes, and the side walls can be vertical or inclined, curved or flat. The number of the cooling zone 2 and the heating zone 3 on the side wall can be one or more respectively. The size of the heating zone and the cooling zo...
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The invention discloses a device and method for enhancing flowing and mixing of fluid in a closed cavity through natural convection. The device comprises side walls defining a cavity body, cooling areas and heating areas are alternately arranged on the two opposite side walls respectively, in the horizontal direction, the cooling area on one side wall corresponds to the heating area on the other side wall, and the heating area on one side wall corresponds to the cooling area on the other side wall. Upward boundary layer flow formed by hot fluid is formed in the heating area, downward boundary layer flow formed by cold fluid is formed in the cooling area, and the upward boundary layer flow and the downward boundary layer flow form two typical reverse flows, namely head-on impact flow and back flow. According to the device and method for enhancing flowing and mixing of the fluid, the fluid in the boundary layer area and the central area of the whole cavity can fully flow and be mixed and adjusted. An additional device does not need to be added in the cavity, the sealing and strength requirements of the cavity can be well met, and the temperature difference threshold value requirement that flow is driven by oblique pressure and does not start flow is met.
Description
technical field [0001] The invention relates to a device and a method for enhancing fluid flow and mixing in a cavity by using the natural convection of reverse flow on the side wall, which belongs to fluid mechanics and relates to the fields of heat transfer, engineering thermophysics, materials science, biopharmaceuticals and the like. Background technique [0002] When the temperature causes the fluid density space to be uneven, the fluid will be subjected to buoyancy to generate flow, and this type of flow is a typical natural convection. The heat transport that accompanies flow (also known as heat convection) is one of the three basic forms of heat transfer. The main control parameters of natural convection include: Rayleigh number, Prandtl number, geometry and heating conditions. Under different parameter conditions, natural convection will have different flow and heat transfer characteristics. [0003] Natural convection can transfer heat through flow on the one han...
Claims
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Login to View More IPC IPC(8): F15D1/00
CPCF15D1/00Y02W10/10
Inventor 聂冰川徐丰邵禹韬
Owner BEIJING JIAOTONG UNIV