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Bubble plume turbulence closing method

A bubble and turbulence technology, applied in instrumentation, electrical digital data processing, computer-aided design, etc., can solve the problems of not considering bubbles, obstructing the dynamic characteristics and motion laws of bubble plumes, and inability to accurately predict the distribution of liquid and gas phases.

Active Publication Date: 2020-05-22
国家海洋环境预报中心
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Problems solved by technology

However, the standard k-epsilon model does not consider the turbulence caused by bubbles and the influence of free interfaces on turbulence, and cannot accurately predict the flow field, turbulence, and gas phase distribution of the liquid phase, which hinders the dynamic characteristics and motion laws of the bubble plume. Research

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0047] Embodiment: In order to verify and analyze a kind of new bubble plume turbulence closing method that the present invention proposes, select two different air volumes and the physical experiment of water depth in the literature to be used for verifying simulation effect, and make with standard k-epsilon turbulence model Compared. The first physical experiment is in a conical-cylindrical metallurgical vessel. The initial water surface height is 1.237m, and the upper and lower diameters are 1.1m and 0.93m respectively. In the center of the bottom, the air is 4.7×10 -4 m 3 The flow rate of / s is injected to form a bubble plume [S.T.Johansen, D.G.C.Robertson, K.Woje, and T.A.Engh, "Fluid dyn...

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Abstract

The invention discloses a bubble plume turbulence closing method in the technical field of fluid engineering, and the method comprises the steps: deducing a source item related to bubbless in a turbulence transportation equation from a control equation of bubble plume based on gas-liquid two-phase bidirectional force coupling, and carrying out the modeling; constructing a free interface turbulencemodel, and deriving a source item of the influence of a free interface on turbulence; constructing a new turbulence model based on a standard k-epsilon turbulence equation, a source item related to bubbles in the turbulence transportation equation and a source item of the influence of the free interface on turbulence; adopting a CFD model of Euler-Lagrange-free interface tracking to simulate bubble plume, and combining a physical experiment to verify the new turbulence model. The new turbulence model provided by the invention can more accurately simulate a flow field and turbulence of the liquid phase, the distribution of the gas phase, the gas-liquid momentum transfer and the like, so that the dynamic characteristics and motion rules of the bubble plume can be more deeply studied.

Description

technical field [0001] The invention belongs to the technical field of fluid engineering, and in particular relates to a method for closing turbulent flow of a bubble plume. Background technique [0002] Bubble plumes are widely used in air curtain breakwaters, metallurgical industry, water and sewage treatment, natural gas leakage, and environmental dredging. Therefore, it is of great significance to understand the dynamic characteristics and flow laws of bubble plumes. Turbulent and multiphase flows are two of the most challenging problems in fluid engineering. There is an exchange of momentum and energy between the gas and liquid phases, and the bubbles can regulate the turbulence of the liquid phase, which in turn will affect the movement and distribution of the bubbles, which makes the turbulence cognition of the bubble plume more complicated. The correct characterization of turbulence is related to the simulation of the flow field, turbulence, bubble distribution, bub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/28G06F113/08G06F119/14
Inventor 潘青青
Owner 国家海洋环境预报中心
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