ISO/DIS 20480-3

Fine bubble technology -- General principles for usage and measurement of fine bubbles

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DRAFT INTERNATIONAL STANDARD
ISO/DIS 20480-3
ISO/TC 281 Secretariat: JISC
Voting begins on: Voting terminates on:
2020-12-21 2021-03-15
Fine bubble technology — General principles for usage and
measurement of fine bubbles —
Part 3:
Terminology and methods for the generation of fine bubbles
ICS: 01.040.07; 07.030
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
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This document is circulated as received from the committee secretariat.
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NATIONAL REGULATIONS.
ISO/DIS 20480-3:2020(E)
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PROVIDE SUPPORTING DOCUMENTATION. ISO 2020
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ISO/DIS 20480-3:2020(E)
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© ISO 2020

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ISO/DIS 20480-3:2020(E)
Contents Page

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

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

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

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

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

4 Examples of terminology and methods for the generation of fine bubbles ............................................3

4.1 Swirling flow system .......................................................................................................................................................................... 3

4.2 Static mixer system ............................................................................................................................................................................. 3

4.3 Ejector system ......................................................................................................................................................................................... 4

4.4 Venturi system ......................................................................................................................................................................................... 5

4.5 Pressurized dissolution system ................................................................................................................................................ 6

4.6 Mechanical shear system ............................................................................................................................................................... 7

4.7 Micropore system ................................................................................................................................................................................. 8

4.8 Surfactant addition micropore system ............................................................................................................................... 9

4.9 Microporous shear system.........................................................................................................................................................10

4.10 Heat separation system ................................................................................................................................................................11

4.11 Mixed vapor condensation system .....................................................................................................................................12

4.12 Swirling flow system .......................................................................................................................................................................12

4.13 Pressurized dissolution system .............................................................................................................................................13

4.14 Static mixer system ..........................................................................................................................................................................14

4.15 Electrolytic system ............................................................................................................................................................................15

4.16 Ultrasound (cavitation) system .............................................................................................................................................16

Annex A (informative) Other examples of terminology and methods for the generation

of fine bubbles ......................................................................................................................................................................................................17

Bibliography .............................................................................................................................................................................................................................18

© ISO 2020 – All rights reserved iii
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ISO/DIS 20480-3:2020(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 on 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 the following

URL: www .iso .org/ iso/ foreword .html.
This document was prepared by ISO/TC 281, Fine bubble technology.
A list of all the parts in the ISO 20480 series can be found on the ISO website.
iv © ISO 2020 – All rights reserved
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ISO/DIS 20480-3:2020(E)
Introduction

Until now the terminology, method and corresponding technology for the generation of fine bubbles

have not been standardized and due to this fact the market of fine bubble industries has not expanded

as rapidly as expected. So we propose the new project to standardize the terminology of fine bubble

generating systems and the corresponding technology, which is thought to have significant influences

on the market as shown follows:

— The convenience of customers when purchasing or using fine bubble generating system and its

techniques will be improved, and owing to the improvement of their convenience it can be expected

to boost fine bubble industries.

— Terminology standardization will enhance commonality in generating system performance fields

and also the performance improvement on hardware and software will prospectively lead to the

market growth of the manufacturing industries for fine bubble generating system.

— Terminology standardization will make it possible to boost the application markets when new

markets launch and also existing markets are unified.

In addition to existing fine bubble technology standards, by specifying "common terms" of generation

principles, best practices to use common terms for fine bubble generating systems will be formed and

market expansion will be expected.
© ISO 2020 – All rights reserved v
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DRAFT INTERNATIONAL STANDARD ISO/DIS 20480-3:2020(E)
Fine bubble technology — General principles for usage and
measurement of fine bubbles —
Part 3:
Terminology and methods for the generation of fine bubbles
1 Scope

This document describes terminology and definitions used in the technology and method for the fine

bubble generating system and components.
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

ISO 20480-2, Fine bubble technology — General principles for usage and measurement of fine bubbles —

Part 2: Categorization of the attributes of fine bubbles
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 20480-1 and ISO 20480-2 and

the following apply..

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

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
3.1
flow path
passage that conveys fluid (3.2.305)
[SOURCE: ISO 5598:2008(en), 3.2.291]
3.2
cavitation

formation and collapse of bubbles in a liquid when the pressure falls to or below the liquid vapour

pressure; the collapse releases energy, sometimes with an audible sound and vibration

[SOURCE: ISO 16904:2016(en), 3.7]
3.3
venturi tube

device which consists of a convergent inlet which is conical connected to a cylindrical part called the

“throat” and an expanding section called the “divergent” which is conical
[SOURCE: ISO 5167-1:2003(en), 3.2.5]
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ISO/DIS 20480-3:2020(E)
3.5
impeller

spinning disc in a centrifugal pump with protruding vanes, used to accelerate the fluid in the pump casing

[SOURCE: ISO 13501:2011(en), 3.1.51]
3.6
solubility

maximum mass of a solute that can be dissolved in a unit volume of solution measured under equilibrium

conditions
[SOURCE: ISO 17327-1:2018(en), 3.16]
3.7
surfactant
surface active substance that reduces the surface tension of the solution
[SOURCE: ISO 8124-7:2015(en), 3.7]
3.8
critical micelle concentration
concentration of dispersing agent above which micelles will form
[SOURCE: ISO 14887:2000(en), 3.4]
3.9
ultrasound

high frequency (over 20 kHz) sound waves which propagate through fluids and solids

[SOURCE: ISO 20998-1:2006(en), 2.22]
3.10
pressure reduction section
portion where the flow passage area of the venturi tube becomes small
3.11
self-priming
suction of fluid into flow path without using pressure feed means
3.12
pressurizing pump
pump to increase pressure (Antonym: Vacuum pump)
3.13
nozzle
structure that accelerates and releases fluid
3.14
porous membrane
membrane containing pores (voids)
3.15
non-condensable gas

air and/or other gas which will not be liquefied under the conditions of a saturated steam

3.16
electrolysis
process in which electric current is used to promote a chemical reaction

Note 1 to entry: In the case of water, an example is the separation of hydrogen from oxygen.

[SOURCE: ISO/TR 15916:2015(en), 3.34]
2 © ISO 2020 – All rights reserved
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ISO/DIS 20480-3:2020(E)
4 Examples of terminology and methods for the generation of fine bubbles
4.1 Swirling flow system

Liquid is made to swirl around the interior of a cylinder at high speed, reducing the pressure near the

central axis of the cylinder and thereby causing gas to be sucked in from the outside. Within the cylinder,

centrifugal separation occurs in which low-density gas is located in the centre and high-density liquid

is located at the cylinder wall. The gas column is pulverized by the fierce shear flow, producing fine

bubbles.
Key
1 fine bubbles
2 liquid
3 gas co
...