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Thin-wall pipe material heat conductivity coefficient calculating method

A technology for calculating thermal conductivity and thermal conductivity, which is applied in the field of calculating thermal conductivity of thin-walled circular tube materials, and can solve the problems of thermal conductivity and measurement methods for thin-walled circular tube materials.

Active Publication Date: 2016-12-14
XI AN JIAOTONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, these methods are all aimed at measuring the thermal conductivity of flat materials. In actual experiments, there is no method for measuring the thermal conductivity of thin-walled circular tube materials.

Method used

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  • Thin-wall pipe material heat conductivity coefficient calculating method

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] system structure

[0027] The invention discloses a method for calculating the thermal conductivity of a thin-walled circular tube material. The method is based on a transient heat conduction calculation model, uses a plurality of equidistant heating rings to heat the circular tube to be tested, and simultaneously measures the temperature change of the heated portion on the surface of the circular tube to be tested. , to obtain the temperature-time response data of multiple equidistant rings on the surface of the ring to be tested, and then calculate the thermal conductivity of the material. The calculation process refers to figure 1 .

[0028] The object to be studied by the present invention is the thermal conductivity of solid materials. First, according to Fourier's law, the three-dimensional temperature change inside the tube to be measu...

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Abstract

The invention discloses a thin-wall pipe material heat conductivity coefficient calculating method adopting a transient heat transfer calculation model and belongs to the field of solid-material thermophysical property measurement. The thin-wall pipe material heat conductivity coefficient calculating method includes: putting forward a new thin-wall pipe heat conductivity coefficient calculating model-a Hot Spring model and giving out a concrete formula; measuring to-be-measured temperature points in the model by applying a temperature sensor, and performing fitting on response data of the measured temperature time to acquire a time parameter sigma; determining the formula of the final Hot Spring model and calculating out heat conductivity coefficient of a thin-wall pipe material according to the slope of the formula. Compared with the prior art, the thin-wall pipe material heat conductivity coefficient calculating method has the advantages that reprocessing of the to-be-measured sample is not needed, experiment procedure is simplified, and precision in measuring the heat conductivity coefficient of the to-be-measured sample of the kind is improved.

Description

technical field [0001] The invention belongs to the field of measurement of thermophysical properties of solid materials, and relates to a method for calculating thermal conductivity of thin-walled circular tube materials. Background technique [0002] With the development of industry, the global energy crisis is becoming more and more serious. How to improve energy utilization has become a research hotspot in the field of energy and environment. Heat transfer is a ubiquitous phenomenon in the process of energy conversion, and thermal conductivity is an important basic thermophysical parameter describing the heat transfer process. It is used to measure the thermal insulation performance and heat transfer characteristics of materials. factors such as water volume and ambient temperature. Tubular materials are widely used in the industrial field, and are the basic materials of heat exchangers in various large-scale power stations, and the heat transfer efficiency of heat exch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 何茂刚辛楠张诗张颖刘向阳
Owner XI AN JIAOTONG UNIV
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