JPS58735A - Testing method for discoloration by diffusion of gas - Google Patents

Abstract

PURPOSE:To make the treatment work on pattern surfaces before and after tests simple by allowing discoloring reagents to exist in the recesses in the plural places of the surfaces of sample models, disposing these in a wind tunnel and diffusing a gas which changes the hues of the discoloring reagents by reacting with said reagents. CONSTITUTION:Recesses 8 are formed in the plural places on the surfaces of sample models 3-5 such as buildings and topographic configurations, and net- like bodies 10 impregnated with discoloring reagents are contained thereon. These are disposed in a see-through wind tunnel 1. After the velocity of wind is controlled to a desired value by driving a fan 6, gaseous ammonia of prescribed concn. is discharged through a gas pipeline 7 and is diffused by wind. The arrival regions of diffusion are known from the degrees of the change in the hues of the reagents, whereby pollution such as atmospheric contamination is measured. Therefore, the work for the pre-treatment and post-treatment for the porpose of disposing the discoloring reagents on the surfaces of the models 3-5 is made extremely simple and the number of steps is reduced considerably.

Description

[Detailed description of the invention] It is about the method.

Smoke emitted from chimneys and tunnel exhaust stacks is spread by the wind and moves downward, potentially causing pollution in nearby areas.

Especially when it comes to the construction of recent thermal power plants, etc.

It is necessary to predict the area and degree of smoke diffusion in advance and take sufficient measures to prevent pollution. Wind tunnel experiments are considered important.

In other words, it simulates in a wind tunnel the way gases such as smoke reach the earth's surface in the natural world.

A so-called test model, such as a model of a building such as a chimney or a model of nearby mountains and rivers, is placed in the wind path of the wind tunnel. Tracer gas is discharged from a fixed position, for example, from the model chimney, and is diffused by the wind inside the wind tunnel. This is to observe or measure the amount of water reaching the model surface.

One method of measurement is to drill a large number of small holes on the surface of the test model and suck the tracer gas through the holes to measure its concentration, while one method of observation is the discoloration test method.

In other words, a test model was placed inside the wind tunnel.

After applying a color-changing reagent to the surface of the model, a gas that reacts with the color-changing reagent and changes the hue of the reagent is discharged from a predetermined position on the model. The gas is diffused by the wind inside the wind tunnel and reaches the surface of the test model, changing the hue of the surface.

Therefore, the area where the color changing reagent changes color is the area where the smoke reaches.
The degree of discoloration is the amount.

To further explain this discoloration test method using drawings, test models 3, 4, and 5 are placed in the air passage of a wind tunnel 1 surrounded by transparent walls and a ceiling 2, and are coated with water-resistant and chemical-resistant paint. (
For example, chimneys, houses, terrain, etc.) are arranged. 6
7 is a gas pipe for discharging a special gas from the model 3.

The color changing reagent to be applied to the surface of test models 3, 4 and 5 is as follows:
5g of Bromthymol Blue in 500ml of ethyl alcohol
Add the solution dissolved in g to the starch paste containing 500 g of starch, and add water to bring the total amount to 84! Use small things.

After operating the fan 6 to set the wind speed in the wind tunnel 1 to a predetermined value, ammonia gas of a predetermined concentration diluted with air is discharged from the chimney test model 3 through the gas pipe 7 at a predetermined speed and diffused by the wind. let

The ammonia gas is blown downwind by the wind inside the wind tunnel 1 and diffuses, and when it comes into contact with the surface of the test models 4 and 5, the discoloration reagent containing bromothymol blue applied in advance changes from orange-yellow to yellow. Since the color changes from green to indigo, it is possible to determine the area where the diffusion has reached from the degree of change in hue.

As described above, although the discoloration test method is extremely effective in easily determining the diffusion and reach area of smoke emitted from a chimney, for example, there are drawbacks.

In other words, for the color-changing reagent applied to the surface of the test model.

Contains starch paste so that it can be applied thinly and evenly. Therefore, the color-changing reagent becomes glued onto the test model, and it takes a long time to remove it after the experiment is completed. In addition, although water is usually rinsed off and wiped with a rag, it takes a lot of effort to treat wastewater by decolorizing and filtering colored water.

In particular, with color-changing reagents, the starch paste dries over time and becomes uneven in some areas, reducing the effectiveness of the reagent, so it is necessary to test quickly so as not to lose the timing.

The present invention eliminates this drawback.

A test model is placed in the air passage of a wind tunnel, recesses are formed at multiple locations on the surface of the test model, a color-changing reagent is present in the portals, and the color-changing reagent is applied from a predetermined position of the test model. A gas that reacts and changes its hue is discharged, and the gas is diffused by the wind in the wind tunnel, and the diffusion status is measured from changes in the hue of the color-changing reagent present at multiple locations on the surface of the test model. The present invention provides a gas diffusion discoloration test method that improves the accuracy and speed of the diffusion test and saves labor.

In the present invention, as described above, a plurality of recesses were formed on the surface of the test model, and a color-changing reagent was present in the recesses. In other words, unlike conventional methods, it is not necessary to apply a thin layer to the surface of the test model, so there is no need to mix starch paste into the color-changing reagent. All you have to do is pack the substance, etc. into the four parts.

Thereafter, a predetermined gas diffusion test is performed, and changes in the hue of the color-changing reagent are observed and recorded.

After the test is complete, do you suck out the remaining color-changing reagent?

The post process is completed by removing the fibrous material and washing the recessed parts.

This makes the gas diffusion color change test extremely simple.

The test method of the present invention will be further explained below with reference to the drawings.

As the color changing reagent, a solution of 5 g of bromothymol blue dissolved in 500 mg of ethyl alcohol is used, and the gas to be diffused is ammonia.

For this color changing reagent, known indicators can be used depending on the gas discharged into the wind tunnel, but in addition to bromothymol blue, phenol red can be used in the color changing region near neutrality.

There are cresol reds and mixtures thereof.

FIG. 2 shows a sectional view of a test model 5 used in this method.

Reference numeral 8 denotes a conical recess provided on the surface of the test model 5, into which a container 9 that matches the gate 8 and whose upper portion coincides with the surface of the test model 5 is fitted. The fibrous material 1 is in the container 9.
0 is packed, and its surface also resembles the test model 5. and be on the same page.

It is impregnated with the color changing reagent described above.

That is, a large number of containers 9 each filled with the fibrous material 10 are prepared and fitted into the recesses 8 on the surface of the test model 5 before the diffusion experiment.

Next, the above-mentioned color changing reagent is taken into a dropper and dripped onto each fibrous body 10.

Ammonia gas was discharged from the test model 3 shown in Fig. 1, and it was diffused by the wind in the wind tunnel 1, and the hue of the color changing reagent impregnated into the fibrous body 1O was changed and observed and recorded. Finish the exam.

After the test is completed, the container 9 is removed from the recess 8.

The fibrous material 10 is discarded and the container 9 is washed.

If you wish to continue testing, please follow the above steps.

Just repeat.

As described above, by using the method of the present invention, gas diffusion discoloration tests, which conventionally required various steps, can be performed extremely easily.

In addition, when the surface of the test model is almost horizontal.

The color-changing reagent may be directly filled into the container 9 without filling the container 9 with the fibrous material 10.

Alternatively, the fibrous material 10 may be directly packed into the recess 8 of the test model without using the container 9, or the color-changing reagent may be filled, but in that case, the recess 8 must be waterproofed.

In the above explanations, the explanation mainly refers to the diffusion of smoke from chimneys, but the explanation is not necessarily limited to this, and air pollution due to the diffusion of gases emitted from cooling towers, tunnel exhaust stacks, automobiles, etc. Needless to say, it is possible to investigate the effects of wind on the natural environment, such as the diffusion of gases flowing out from storage tanks for fuels such as liquefied natural gas and various chemical raw material gases such as liquefied ethylene.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the equipment for gas diffusion discoloration test, Figure 2
The figure is a partial sectional view of a test model used in the method of the present invention. 1: Wind tunnel, 3, 4, 5: Test model, 8: Recess. 9: Container, 10: Fibrous body. Figure 1?

Claims (1)

[Claims] A test model is placed in the wind path of a wind tunnel, recesses are formed at multiple locations on the surface of the test model, a color-changing reagent is present in the recesses, and the color-changing reagent is applied from a predetermined position of the test model. A gas that reacts with and changes its hue is discharged, and the gas is diffused by the wind inside the wind tunnel, and the diffusion status is measured from changes in the hue of the color-changing reagent present at multiple locations on the surface of the test model. Gas diffusion color change test method.