Given the specificity of the method implementation called cylindrical layer to determine the therma

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Method cylindrical layer or as it is popularly called the "method of pipe", known from the first half of the twentieth century, is simple to implement and gives sufficient accuracy in the determination of the thermal conductivity λ unknown bulk material. However, for solidifying liquid composite paste, consisting of thin-walled aluminosilicate and ceramic microspheres with Ø 200 .. 100 microns Intersectoral latex and acrylic filler (plus light titanium pigment), requires a special approach to the implementation of the named method.
First, for obtaining high accuracy in determining λ, requires high precision control duke smart home of the thickness of the cylindrical layer of ultrafine composite. You need to develop a special tool for precise application of the liquid paste, followed by a high-precision thickness control of the dried layer.
Secondly, based on the technology of drying pasta and principles in the outer layer of insulating material from the microspheres, it is impossible duke smart home and unacceptable to fill paste into the gap between the two pipes, as it is practiced in the classical method of the cylindrical layer. It is necessary that the outer layer of the paste was open to the surrounding airspace. But then, because of damage to the outer layer of non-dried pasta is unacceptable and all the contact methods for measuring the temperature of its outer layer. Requires specific compensation data for non-contact temperature measurement of the outer layer.
Given the specificity of the method implementation called cylindrical layer to determine the thermal conductivity of liquid composite material preparation and measurement laboratory setup we conducted measurements themselves in three stages.
Initially studied different methods of applying heat insulating composite paste on the surface duke smart home of a flat steel plate (brush, trowel, spray) and the degree of its subsequent duke smart home shrinkage duke smart home in its original "wet" thickness δ = 1,5 mm. The layer thickness was controlled by ultrasonic flaw detector with an error Δδ = 0,05 mm. After 24 hours drying, the paste layer is reduced to a thickness δ = 1,4 mm. In what follows, within the layer of paste (about the middle of its thickness) was implemented wren fine Chromel-Copel thermocouple Ø 0,25 mm diameter.
In this case, the luminance infrared pyrometer "Python" measured surface temperature of the composite material and written evidence, tested in advance of the thermocouple. It turned out, on average, pyrometer "Python" duke smart home fixed temperature on the surface of 0,6 C lower than the temperature, which was inside a layer of dried pasta. This experiment allowed us to ensure sufficient accuracy of the temperature measurement of the outer layer of dried pasta infrared pyrometer at subsequent stages of the study. duke smart home
Fig. 1. The axial sectional area of application of the liquid paste by precision bushings funnels. 1 - Lower sliding emphasis, duke smart home 2 - upper sliding emphasis, 3 - tube wall PETN, 4 - thermocouple wires 5 - liquid paste, 6 - Body-precision sleeve funnel.
Fig. 1 shows a sleeve-hopper top and bottom. duke smart home Around the circumference of the tube PETN funnel had three equally spaced stops, allowing for slidably move along the surface of the funnel, which is applied to a liquid paste.
The inner cylindrical groove was made with a tolerance d +0,025 duke smart home mm, which allowed (subject to a snug fit stops) to achieve set the thickness δ liquid paste the output of the funnel with a deviation 0,030 mm. First sleeve Funnel inflicted paste layer thickness δ = 1,1 mm. After drying, the layer thickness was reduced to about 1.0 mm.
Second sleeve (moving it stops moving on the remaining three slots-trail from the first sleeve) made a second layer of pasta new 1.1 mm thick. After re-drying, a second layer of paste on the surface of the liquid throughout the tube obtained was uniform insulating layer with a thickness of 2.0 mm.
The final thickness of the thermal insulation layer controlled ultrasonic duke smart home device. Wire thread thermocouples chromel-copel were laid on one sector of the tube and do not interfere with the promotion of the sleeves-hoppers, as were between adjacent sliding stops.
Heater capacity (including cosφ) controlled power meter class 1 accuracy. Calibrated thermocouple readings were taken precision multimeter "ARRA-108M" (error