A device and method for in-situ measurement of steady-state heat transfer properties of variable-density fibers

Abstract

The invention relates to a device and method for in situ measuring steady-state heat transfer character of variable density fibrous. The device comprises a main force application device, a load-bearing positioning device, a digital camera device, a light measurement device, an intra-cavity pressure measurement device, a data acquiring card, a driving and control circuit, a data acquiring treatment and interface control module and a computer in the original patent, and further comprises improved components such as a push barrel measurement cavity, a fiber plug barrel, a lower measurement cavity, a heating control device, a heat testing device, a data acquiring card and a data acquiring processing module, wherein the data acquiring card and the data acquiring processing module are connected with the push barrel measurement cavity, the fiber plug barrel, the lower measurement cavity, the heating control device and the heat testing device. The testing method of the device comprises the steps of playing the effect of the force on the fibrous to change the density and the density distribution, playing the heating effect on the fibrous to generate a certain temperature difference between two ends of the fibrous, testing the temperature difference and heat fluxes at the two ends of the fibrous to obtain a heat conductivity coefficient and the heat resistance of the fibrous. The method and the device disclosed by the invention are high in measurement precision, convenient for sample preparation, short in testing time, wide in applicable range, and suitable for the in-situ measurement on the steady-state heat transfer character under a fibrous variable density condition.

Description

technical field [0001] The invention relates to a steady-state in-situ measurement technology of the heat transfer properties of fiber bodies, which can be used to test the thermal conductivity and thermal resistance of various fiber bodies under variable density conditions. Background technique [0002] Fibrous bodies, that is, aggregates of fibrous substances, are usually used as thermal insulation materials for clothing, building insulation layers, thermal insulation protection layers for space shuttles and launch vehicles, etc. In actual use, low-density filled flocculent fiber aggregates are usually subjected to external Changes in density and density distribution are caused by the force, which causes changes in its heat transfer properties; in addition, when designing a fiber body, it is usually necessary to select the best density value to obtain the best heat insulation effect, and obtain samples with different densities for testing The program is very complicated. ...

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Problems solved by technology

[0004] These methods mainly have several problems: first, the test of fiber materials is often static, and it is impossible to test the heat transfer properties of fiber materials under the condition of variable density under the action of external force; Therefore, the consistency and comparability of the sample preparation are poor; thirdly, the original device is generally used for testing the formed textiles (fabric or felt), and cannot directly measure the heat transfer properties of the filling material, which requires complex sample preparation procedure

[0005] It can be seen that there is currently a lack of a device capable of in-situ testing the steady-state heat transfer properties of various fibers under variable density conditions

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