Fine bubble technology — General principles for usage and measurement of fine bubbles — Part 2: Categorization of the attributes of fine bubbles

This document establishes the general principles and descriptors to allow users to describe the quality of the liquid media and the size and concentration of fine bubbles. It is also intended to allow users to classify fine bubbles by rise velocity.

Technologie des fines bulles — Principes généraux pour l'utilisation et la mesure des fines bulles — Partie 2: Classification des attributs des fines bulles

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Status
Published
Publication Date
14-Nov-2018
Current Stage
6060 - International Standard published
Start Date
15-Nov-2018
Completion Date
15-Nov-2018
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ISO 20480-2:2018 - Fine bubble technology -- General principles for usage and measurement of fine bubbles
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INTERNATIONAL ISO
STANDARD 20480-2
First edition
2018-11
Fine bubble technology — General
principles for usage and measurement
of fine bubbles —
Part 2:
Categorization of the attributes of
fine bubbles
Technologie des fines bulles — Principes généraux pour l'utilisation et
la mesure des fines bulles —
Partie 2: Classification des attributs des fines bulles
Reference number
ISO 20480-2:2018(E)
ISO 2018
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ISO 20480-2:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2018 – All rights reserved
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ISO 20480-2:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General principles for usage and measurement of fine bubbles ....................................................................... 1

4.1 Standards system of fine bubble technology ................................................................................................................ 1

4.2 Quality of liquid medium................................................................................................................................................................ 2

5 Expression of attributes for fine bubbles ................................................................................................................................... 2

5.1 Application of size index and number concentration index ............................................................................ 2

5.1.1 General...................................................................................................................................................................................... 2

5.1.2 Size index rules ................................................................................................................................................................. 3

5.1.3 Number concentration principles ..................................................................................................................... 3

5.1.4 Number concentration index rules .................................................................................................................. 3

5.2 Expression of class of fine bubbles in dimensional characteristics .......................................................... 3

6 Classification of the attributes of fine bubbles by rise velocity ........................................................................... 4

6.1 Attributes of fine bubbles by rise velocity ....................................................................................................................... 4

6.2 Classification of fine bubbles by rise velocity............................................................................................................... 5

6.2.1 General...................................................................................................................................................................................... 5

6.2.2 Classification and definition of regions ........................................................................................................ 6

Annex A (informative) Observation examples of ultrafine bubble number stability in liquids .............8

Bibliography .............................................................................................................................................................................................................................10

© ISO 2018 – All rights reserved iii
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ISO 20480-2:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 281 Fine bubble technology.

A list of all parts in the ISO 20480 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2018 – All rights reserved
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ISO 20480-2:2018(E)
Introduction

In recent years, readily available measurement techniques of bubbles have made it possible to

characterize microbubbles and ultrafine bubbles. Such techniques have shown that ultrafine bubbles

can almost remain as they are for a number of months.

Fine bubble technologies are very new, and their applications are useful in a number of fields today.

Developing appropriate terminology for such a diverse area of technology is therefore critical to

business trade or product acceptance, in view of the wide range of users of fine bubbles.

For better communication among the users of fine bubbles, this document introduces the quality criteria

of a medium such as water, as well as two indices, one for size and the other for number concentration.

This document also provides an explanation for classifying fine bubbles by dimensional characteristics

and by rise velocity.

It should be noted that the motion of bubbles in a medium can be determined by buoyancy forces

or randomly and thermally activated processes leading to Brownian motion. For this reason, larger

bubbles can display buoyant behaviour (rise upwards) and smaller bubbles remain in the liquid medium

displaying random motion. This document focuses on the definitions of such entities.

© ISO 2018 – All rights reserved v
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INTERNATIONAL STANDARD ISO 20480-2:2018(E)
Fine bubble technology — General principles for usage and
measurement of fine bubbles —
Part 2:
Categorization of the attributes of fine bubbles
1 Scope

This document establishes the general principles and descriptors to allow users to describe the quality

of the liquid media and the size and concentration of fine bubbles. It is also intended to allow users to

classify fine bubbles by rise velocity.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 20480-1, Fine bubble technology — General principles for usage and measurement of fine bubbles —

Part 1: Terminology
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 20480-1 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
rise velocity
velocity of a fine bubble upwards in liquid
3.2
terminal rise velocity
balancing velocity between the buoyancy of fine bubbles and the viscous drag

Note 1 to entry: It is the velocity in the opposite direction to the terminal settling velocity. If a rise velocity were

to be defined as the terminal settling velocity, the rise velocity would be negative. Therefore, in the classification

of fine bubbles, terminal rise velocity is preferred over terminal settling velocity to avoid confusion.

4 General principles for usage and measurement of fine bubbles
4.1 Standards system of fine bubble technology

The purpose of this document is to provide people who develop standards for fine bubble technology

with an overall framework and guidelines, and to facilitate communication among users of fine

bubbles. To assist in the preparation of consistent standards, a three-layered standard system has been

established.
© ISO 2018 – All rights reserved 1
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ISO 20480-2:2018(E)
This consists of the following.

a) The first layer (basic standards) covers common terminology, basic concepts, and principles for

measurement and usage that can be applied to fine bubble technology. This document is part of the

basic standards, and is intended to be used as a basis for the next two layers.

b) The second layer (measurement standards) covers various measurement methodologies for

characterization, such as bubble diameter and number concentration index, as well as common

methods for sampling and sample preparation.

c) The third layer (individual application standards) covers individual applications in areas

including:

1) food, plant cultivation, agriculture, drinking water, and cosmetics industries;

2) the medical and pharmaceutical fields;

3) manufacturing of new functional materials, solar cells, semiconductors, and liquid crystals;

4) processes such as cleaning, toilet flushing, soil washing, water treatment, etc.

4.2 Quality of liquid medium
The performance of the liquid medium with
...

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