JPS61148340A - Fluid tester - Google Patents

Abstract

PURPOSE:To enable the observation of a fluid even within a complicated construction, by building up a model of a passage with a transparent member while making a liquid almost the same in the refractive index as the transparent member flow into the model. CONSTITUTION:A drain tube 3 is used to drain a weak alkali aqueous solution 4 (e.g. and aqueous solution of diluted sodium hydroxide). The drain tube 3 is inserted between tubules 1b. The, a liquid 2 is made to flow into a model 1, the tip of the drain tube 3 is positioned at a part intended to be vidualized in the model 1 to drain the weak alkali aqueous solution 4. The weak alkali aqueous solution 4 flows turning red in reaction with the liquid 2 containing phenolphthalein. Since the refractive index is so equal between the model 1 and the liquid 2 to make the model 1 transparent completely thereby allowing one to observe the red flow of the liquid only. Thus, the fluid even in a complicated construction can be observed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for observing the flow of liquid in a channel through which the liquid flows.

[Conventional technology] If there is an uneven flow distribution in a channel through which liquid flows, such as in a shell-and-tube heat exchanger or the core of a nuclear reactor, performance may not be achieved or large thermal stress may occur due to uneven temperature distribution. There is a problem.

In addition, in water turbines, etc., it is necessary to analyze the flow of water inside the turbine in order to increase its capacity.

In such cases, it is difficult to predict the flow distribution etc. by calculation, and in many cases the actual size of the target flow path or
We are creating a scale model and actually flowing liquid to observe the flow.

[Problem that the invention seeks to solve] However, when creating a metal model.

Structures 1 with complex interiors, such as heat exchangers, have many pipes, and water turbines have many blades, making it difficult to observe the internal flow.

Therefore, the model is sometimes made of a transparent material 1, such as glass or plastic, but the examiner observing from the outside can only observe the closest part.
It was not possible to observe the delicate flow inside.

Therefore, three important non-uniformities in flow could be overlooked.

[Means for Solving the Problems] The flow test device of the present invention is a device for observing the flow of liquid in a channel through which the liquid flows, and forms a model of the channel using a transparent member. A liquid having substantially the same refractive index as that of the transparent member is caused to flow into the model.

[Effect]

According to the apparatus of the present invention, since the model is formed of a transparent member having substantially the same refractive index as the refractive index of the liquid flowing inside the model, the model can be made completely transparent.

Therefore, it becomes possible to clearly observe the flow of liquid inside the model.

[Example] The present invention will be explained below using an apparatus according to an embodiment shown in the drawings.

Reference numeral 1 denotes a model of a heat exchanger, which consists of an outer cylinder 1a and a thin tube 1b, and is made of glass with a refractive index of 1.45.

2 is a liquid, which is a sodium iodide solution containing phenolphthalein, and has a refractive index adjusted to 1.45.

Note that 3 is a discharge pipe for discharging a weak alkaline aqueous solution (for example, a dilute aqueous sodium hydroxide solution) 4, and is inserted between the thin tubes 1b. 5 is a pump that circulates the liquid 2.

Now, the liquid 2 is poured into the model 1, the tip of the discharge pipe 3 is positioned at a portion of the model 1 that is desired to be visualized, and the weak alkaline aqueous solution 4 is discharged. The weak alkaline aqueous solution 4 reacts with the liquid 2 containing phenolphthalein, turns red and flows. Since the refractive index of model 1 and liquid 2 are the same,
The model 1 becomes completely transparent, and the observer can only observe the flow of the red liquid.

Note that if you continue to observe for a long time, the liquid 2 will become opaque and difficult to see (
When this occurs, it is sufficient to mix an acidic liquid into liquid 2 to neutralize the reaction of phenolphthalein.

Note that it is not necessary to include phenolphthalein in the liquid 2. For example, it is possible to mix red ink into the liquid 2, or to add aluminum powder or expanded polystyrene beads as a tracer. However, since the liquid 2 gradually becomes cloudy, appropriate measures must be taken, such as replacing the liquid 2 or removing the tracer with a filter.

In the above embodiment, the model 2 is made completely transparent, but it is also necessary to observe a part of the model in correspondence with the flow. In this case, a transparent member having polarizing properties may be used as a part of the model. In other words, all you have to do is make the parts of the model that are considered important for visualization polarized so that they are visible when viewed from a certain angle.

When the refractive index of the model and the liquid are made approximately the same.

When the material of the model is determined in advance, the refractive index can be adjusted by changing the concentration of the liquid.

On the other hand, if the refractive index of the liquid is determined first, the refractive index of glass can range over a wide range, so an appropriate one should be selected.

[Effects] As described above, according to the apparatus of the present invention, the channel model can be made transparent, so that it becomes possible to observe the flow inside a complicated structure.

[Brief explanation of the drawing]

The drawing is a diagram of an apparatus showing an embodiment of the present invention. l...Model, 2...Liquid

Claims (2)

[Claims] (1) A device for observing the flow of liquid in a channel, in which a model of the channel is formed using a transparent member, and a liquid having a refractive index that is approximately the same as that of the transparent member is used. A flow testing device characterized by allowing flow to flow inside the model. (2) The flow test device according to claim 1, wherein a polarizing transparent member is used for at least a portion of the transparent member.