SU1458783A1

SU1458783A1 - Apparatus for simulating thermal gradient processes in soil specimens

Info

Publication number: SU1458783A1
Application number: SU864165912A
Authority: SU
Inventors: Vladimir I Avilov; Artem A Geodekyan; Aleksandr V Egorov
Original assignee: Inst Oceanologii Imeni Pp Shir
Priority date: 1986-10-03
Filing date: 1986-10-03
Publication date: 1989-02-15

Description

The invention relates to the field of construction. The aim of the invention is to expand the range of research. The device comprises a cylindrical chamber 1, internal sample rings, external annular nagas; cages 3, annular thermoelements 4, thermal insulation casing 10. Thermocouples 4 are made with through-holes

ЗЦ 1458783

five

can be moved and fixed on the chamber 1. The chamber 1 and the outer annular nozzles are made of heat-conducting material (brass). As thermoelements 4 heat exchangers are used, connected by supply lines 8 with liquid thermostats 9 operating on an external circuit. The implementation of the heat-conducting chamber with heat-conducting nozzles allows not

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Only to protect the sample from thermal contact with the external environment, but also to maintain the same temperatures on the side parts as in the middle parts of the sample, and the execution of thermoelements with the ability to move and fix along the chamber axis allows varying the height and number of sample layers . 1 il.

one

The invention relates to the construction * stvu, in particular to heat engineering calculations of the interaction of the foundations with the soils of the grounds.

The purpose of the invention - 'extension 5

range of studies.

The drawing shows a General view of the device, the cut.

The unit has a cylindrical chamber 1, an inner liner 2 in 10

as sample rings, external annular nozzles 3, annular thermoelements ^. Chamber 1 is made of heat-conducting material, for example, brass, with a protrusion 5 for fixing the inner part of the lower thermoelement. Thermocouples 4 consist of two parts, internal and external, and can move along the chamber. In working position, both parts of thermoelements are located on the same level. The internal parts of thermoelements are fixed by means of an annular protrusion 5 and a clamping. screws 6, which are screwed into the cover 7, the external parts of the thermoelements are fixed on the chamber, for example, by means of locking 'screws. The number of inner rings 2 corresponds to the number of sample layers and can be made of Teflon. The order of location corresponds to the tasks solved in the experiment. Outer annular nozzle made also _hours of heat-conducting material 35 (brass). The inner diameter is. The attachment is П _{В (((it} is equal to the outer diameter of the chamber, and the outer diameter is

When the nozzle P depends on the thermal conductivity of the sample layers under study, U is determined by the formula

20

25

thirty

o = 3/1 + (- | £ ~ - ι)

where SC is the inner diameter of the chamber, m;

outer diameter of the chamber, m;

with! _e

.to

the ratio of the thermal conductivity of the ΐth layer of the sample to the thermal conductivity of the least thermally conductive layer is L _o .

In this case, the total thermal conductivity of the chamber walls all with the nozzle in each section will be proportional to the thermal conductivity of the soil sample in the same section, which means that the temperature distribution in the chamber walls along the vertical axis will be the same as the temperature distribution in the layered sample with an infinitely cross-sectional area of samples.

As thermoelements, heat exchangers connected by supply lines 8 with liquid thermostats 9 operating on an external circuit can be used. The installation is equipped with a heat shield 10 with a deforming heat insulator (mineral wool).

The preparation of the installation to work is as follows.

The primers are placed in the rings of the inner liner 2 in accordance with the natural occurrence. Outer annular nozzles 3 are selected based on the condition of proportionality of thermal conductivity of the walls of chamber 1 and the soil sample. Tremo elements 4 are brought to the front parts of the inner liner 2 and fixed them on the chamber with the help of stop screws. Installation Assembly

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outside3

placed in a heat shield

ten.

Use in the device of these nozzles, inner rings

Visible thermoelements can significantly expand the capabilities of research of thermogradient processes in layered media.

Claims

Claim

A device for simulating thermogradient processes in soil samples, including a heat-insulating casing, a cylindrical chamber made of heat-conducting material, an inner liner and thermoelements located at the ends of the chamber, characterized in that the chamber is equipped with external annular nozzles thermally conductive material, the inner liner is made composite in the form of a set of rings, and thermoelements are made with through channels and are mounted for movement and fixation and on the chamber, with the height of the outer annular nozzles corresponding to the height of 10 rings of the inner liner, and their outer diameter is determined by the formula:

p · = yf ₊ - 1), m,

where SC is the inner diameter of the chamber, m;

8 ^ - external diameter of the chamber, m;

B, the ratio of the thermal conductivity of the ίth layer of the sample to the heat conductor of the least thermally conducting layer is Λ _β .