SU813220A1 - Device for measuring thermal-physical characteristics of liquids - Google Patents

Description

one

The invention relates to a test apparatus, in particular, to devices for determining the thermophysical characteristics of liquids.

Apparatuses for determining the thermophysical characteristics of materials are known, comprising a thermostatted housing in which a sample box, a temperature measuring circuit and a device for detecting the temperature measuring time 1 are placed.

The disadvantage of these devices is the need for prolonged temperature control of the sample and the low accuracy of the results obtained.

The closest to the invention is a device that determines the thermal characteristics of liquids (thermal conductivity coefficient) by the method of two temperature-time intervals, which contains a constant temperature heater with one of the thermocouple junctions, a cuvette for liquids with known (reference fluid) and thermal properties studied. , made in the form of a cylinder with a bottom of a material of high thermal conductivity, and supports for

heat receiver in the form of a ring; a heat receiver of a cylindrical shape, mounted on a liquid support, equipped with a second junction of a thermocouple mounted on its end surface in contact with the test medium; recording galvanometer 2.

The disadvantage of this device is a decrease in the accuracy of the results obtained, since when measuring the difference in relative temperatures for the reference and the test liquid, it is difficult to create the same conditions for the experiment and the longer the test.

The purpose of the invention is to improve the accuracy of determining the tests of thermophysical characteristics and reducing the time of testing.

Claims (1)

The goal is achieved by the fact that in the device the cuvette is made in the form of two identical volumes separated by a partition of heat insulating material for the reference and studied, and the heat sink is made with a cutout on the end surface equal to the width of the partition, and an additional thermocouple is installed on its end surfaces connected to an additional galvanized FIG. 1 shows a diagram of the device; in fig. 2 - the same, top view. The device contains a constant temperature heater 1 with one of the junctions 2 thermocouples mounted on it, a cuvette 3 made in the form of two identical volumes separated by a partition 4 of thermal insulation material into which the benchmark 5 is placed and the liquid b is investigated. At the bottom of the cuvette, the support 7 is made in the form of two half-rings. A heat receiver 8 is installed on the support; it is made in the form of a cylinder with a notch on the end surface equal to the width of the petorts core ln DsprI ..., g ;; , LJ „-tchlgchgi-10G YPPPYPUNPSTI cell walls. On the end surface of the regioidli i iuD4-i. - -g- „Q of the heat receiver installed the second junction 9 ,,, l. i3 poi dtpppi gpai at the thermocouple connected to /.BajMej rum 10. In addition, on each of the end surfaces of the heat sink, separated by a cutout, the junction of thermocouple 11, k the ends of which are connected galvanometer 12. „„ „,,.„ „,„.,. „,. A lvanometer 1. The device works as follows: a support 7 is placed in a cuvette 3, a reference 5 is simultaneously poured, and 6 liquids are examined. On support 7, a heat collector 8 is installed so that the partition 4 of the cell enters its cut-out. The cuvette is installed on the heater L The heater is turned on and the galvanometers 10 and 12 begin to indicate the electric current According to the magnitude of the electric current on the galvanometer. 10 determines the relative temperature between the heater and, lt1 m / tl, 1 PGTNYa on the surface of the test liquid, and by the galvanometer 12 - the difference of the relative temperatures on the surface are investigated. Oh and the reference fluid. After that, the thermal conductivity coefficient of the studied material is calculated using known dependencies. Thus, this method is impressive, which allows us to exclude the conditions of the experiment on the accuracy of the results obtained. The accuracy increases by an average of. The invention The device for determining the thermophysical characteristics of liquids containing Aaparvju pii -i «. „„ M of a cuvette with a support, heat .. „„ „„ T o QTTL irinRpTv G oooooi., Heat heater, „..„ .. nunvju, neck heater, JVIUDCI ..- thermocouple thermometer and recording, gl / chyuces The fact that, from a higher accuracy of determination: -p, the physical characteristics and reduction of the test time, the cuvette is made in two identical volumes, g, gjjjjyx with a partition of heat-insulating material, for the reference and test media, and the heat sink is cut with on the end surface equal to the width of the partition, and on both end surfaces The st x of the junction of the additional thermocouple connected to the additional galvanometer is installed. Sources of information taken into account during the examination 1 Copyright certificate CLC.K No. 225503, cl. G 01 N 25 / L8, 1968. 2 Volkenshteyn, V. S. The high-speed method for determining the thermophysical characteristics of the materials determined, - HGP material characteristics, M., “Energia, 197L, M l- NRPGIIA. 1U / 1, p. 73 (prototype).