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Numerical calculation method for heat transfer of electrostatically suspended liquid alloys

A technology of electrostatic suspension and liquid alloy, which is applied in the numerical calculation of heat transfer of electrostatic suspension liquid alloy, and the heat transfer calculation field of regular and irregular shape alloy droplets, which can solve the problem of influence, uneven temperature distribution of droplets, and inability to obtain liquid state Alloy internal temperature field distribution and changes

Active Publication Date: 2018-11-06
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] At present, the existing experimental methods and main calculation models cannot obtain the distribution and change of the temperature field inside the liquid alloy.
With the increase of electrostatically suspended alloy droplets or the increase of cooling rate, the temperature distribution inside the droplets is not uniform, and the uniform temperature field assumed by the traditional model cannot objectively reflect the temperature distribution inside the droplets.
Moreover, under the action of gravity, electrostatic force, and surface tension, the shape of the alloy droplet with a larger diameter no longer maintains the standard spherical shape, and the change of its shape will also affect the temperature field inside the alloy droplet to a certain extent.

Method used

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Embodiment Construction

[0088] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0089] 1. Determine the geometric shape of the droplet, and use its front view as the calculation solution area:

[0090] The actual form is obtained through experiments or the simulated form is obtained by calculation, such as figure 2 .

[0091] Electrostatic suspension alloy droplet diameter 0.1 ~ 10mm, z m / r m =1~1.57, where z m and r m are the maximum values ​​of the vertical and horizontal diameters of the droplet, respectively.

[0092] 2. Establish heat transfer governing equation and boundary heat exchange conditions:

[0093] (1) The governing equation of droplet heat transfer is:

[0094]

[0095] Among them, T(x, y, z; t) is the temperature field function about the position (x, y, z) and time t, u is the internal flow velocity of the droplet, ρ, c, λ are the droplet density, specific heat, Thermal Conductivity.

[0096] Because the inte...

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Abstract

The invention relates to a numerical calculation method for heat transfer of electrostatically suspended liquid alloys, which relates to a calculation method for heat transfer of liquid alloys with regular and irregular rotation symmetrical structures under electrostatically suspended conditions. The finite volume method is used to solve the heat transfer equation of the irregular liquid alloy vianumerical iteration, and the change of the temperature field in the liquid alloy along with time is obtained. The invention solves the problem that the electrostatically suspended liquid alloy droplet temperature measurement is difficult and the error is large, and the heat transfer calculation model can only get the temperature and the change condition of the alloy droplet particle. By using thenumerical calculation method for heat transfer of electrostatically suspended liquid alloys, (1) the alloy droplet heat transfer with regular and irregular rotationally symmetrical structure can be obtained under the electrostatic suspension condition; and (2) the abundant and accurate heat transfer information, such as temperature distribution, temperature gradient and cooling rate, of the liquid alloy is also obtained.

Description

technical field [0001] The invention belongs to the technical fields of heat transfer calculation and electrostatic levitation, and relates to a heat transfer numerical calculation method of an electrostatically suspended liquid alloy, in particular to a heat transfer calculation of regular and irregular shape alloy droplets under electrostatic levitation conditions. Background technique [0002] The liquid alloy in the electrostatic suspension state avoids contact with the container wall and can obtain a greater degree of supercooling, which is helpful for the study of the solidification mechanism and thermophysical properties of the deep supercooled liquid alloy. The real-time observation and control of the temperature and change trend of the liquid alloy in the electrostatic levitation state is the premise of the above research, so it is particularly important to accurately obtain the droplet temperature distribution and its change law. [0003] In recent years, the main ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F17/11
CPCG06F17/11G06F30/23
Inventor 王海鹏李明星魏炳波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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