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Method for calculating equivalent thermal conductivity coefficients of hollow glass beads

A technology of equivalent thermal conductivity and glass microspheres, which is applied in the field of materials, can solve problems such as the inability to directly measure the thermal conductivity of a single hollow glass microsphere, and achieve the effects of high calculation accuracy, convenient use, and simple principle

Active Publication Date: 2018-11-06
HENAN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] When designing new insulation materials, in order to better evaluate the thermal conductivity of new insulation materials filled with hollow glass beads, it is necessary to accurately determine the equivalent thermal conductivity of hollow glass beads; however, due to the Spherical shape, hollow structure and small particle size, conventional experimental measurement methods such as steady-state plate method and transient planar heat source method cannot directly measure the thermal conductivity of a single hollow glass bead

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  • Method for calculating equivalent thermal conductivity coefficients of hollow glass beads
  • Method for calculating equivalent thermal conductivity coefficients of hollow glass beads
  • Method for calculating equivalent thermal conductivity coefficients of hollow glass beads

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Embodiment 1

[0059] Such as Figure 1-Figure 8 As shown, a method for calculating the equivalent thermal conductivity of hollow glass microspheres, the calculation method includes the following steps:

[0060] Step 1: Embed hollow glass microspheres and their equivalent solid spheres in a virtual matrix material at the same volume ratio, and establish two periodic composite material systems 1 and 2;

[0061] Step 2: Establish representative material units 1 and 2 in periodic composite material systems 1 and 2, respectively;

[0062] Step 3: Apply different temperature boundary conditions on the two opposite surfaces of composite material elements 1 and 2, and then use the finite element method to calculate the heat flow distribution on a certain temperature surface;

[0063] Step 4: Calculate the equivalent thermal conductivity of composite material unit 1 by using the composite material homogenization method;

[0064] Step 5: Assuming that the thermal conductivity of the equivalent soli...

Embodiment 2

[0103] Hollow glass beads with an outer diameter of 58.64 microns and a wall thickness of 1.58 microns are used to calculate and determine their thermal conductivity, including the following:

[0104] 1. The thermal conductivity of the hollow glass bead glass wall material is 1.03W / (mK), the thermal conductivity of the air inside the package is 0.023 W / (mK), and the thermal conductivity of the virtual matrix material is 0.93W / (mK);

[0105] 2. Apply temperatures of 10 degrees Celsius and 30 degrees Celsius on the two parallel sides of composite material units 1 and 2, respectively;

[0106] To illustrate the robustness of the method of the present invention:

[0107] (1) During the calculation process, the volume ratios (10%, 20%, 30%, 40%) of four different hollow glass microspheres and their equivalent solid spheres in the virtual composite system are investigated, Figure 8 What is shown is the prediction result of the thermal conductivity of hollow glass microspheres unde...

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Abstract

The invention relates to a method for calculating equivalent thermal conductivity coefficients of hollow glass beads. The method comprises the following steps: step 1, embedding the hollow glass beadsand equivalent solid spheres thereof in a virtual matrix material, and establishing two periodic composite material systems 1 and 2; step 2, establishing representative material units 1 and 2 in theperiodic composite material systems 1 and 2; step 3, applying different temperature boundary conditions to two opposite surfaces of the composite material units 1 and 2; step 4, calculating the equivalent thermal conductivity coefficient of the composite material unit 1; step 5, drawing the equivalent thermal conductivity coefficient changing curve of the corresponding composite material unit 2; and step 6, using the intersection between the equivalent thermal conductivity coefficient of the composite material unit 1 and the equivalent thermal conductivity coefficient changing curve of the composite material unit 2 as the equivalent thermal conductivity coefficients of hollow glass beads. The method has the advantages of being simple in principle, convenient to use, and high in calculatingprecision.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for calculating the equivalent thermal conductivity of hollow glass microspheres. Background technique [0002] Hollow glass microsphere is a hollow spherical ultra-light inorganic non-metallic material, which can be sorted and extracted from industrial waste slag and fly ash. Filler; its density is between 0.15-0.60g / cm3, particle size is between 5-180μm, it has non-toxicity, light weight, large specific surface area, small size, low thermal conductivity, high compressive strength, dispersibility and fluidity It has the characteristics of strong resistance, good chemical stability, strong mechanical properties and heat insulation effect, and is often used in the design of heat insulation materials. [0003] When designing new insulation materials, in order to better evaluate the thermal conductivity of new insulation materials filled with hollow glass bea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 王辉赵新娟赵吉义杨莹陈俊旗
Owner HENAN UNIVERSITY OF TECHNOLOGY
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