Gas flow estimation method, hole diameter estimation method, gas flow rate estimation device, and hole diameter estimation device

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United States of America

PATENT NO 12264949
APP PUB NO 20220349735A1
SERIAL NO

17764304

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Abstract

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A flow rate of a gas is determined based on a predetermined relational expression including, as parameters: the flow rate of the gas; diameter and length of a hole; upstream and downstream pressures; and temperature, molecular weight, viscosity coefficient, and specific heat ratio of the gas. Additionally, setting conditions for a type and temperature of the gas, the length of the hole, and the pressures upstream and downstream from the hole are set; the relational expression is used to obtain the correspondence relationship between the diameter of the hole and the flow rate of the gas flowing through the hole; an approximation function approximating the obtained correspondence relationship is determined; the flow rate of a gas passing through a test piece having a hole of an unknown diameter is measured; and the diameter of the hole is estimated, based on the measured flow rate and the approximation function.

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Patent Owner(s)

Patent OwnerAddress
NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY3-1 KASUMIGASEKI 1-CHOME CHIYODA-KU TOKYO-TO 100-8921
FUKUDA CO LTD16-5 NUKUI 3-CHOME NERIMA-KU TOKYO 1760021

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Arai, Kenta Tsukuba, JP 46 30
Hara, Tsutomu Tokyo, JP 76 1280
Hirata, Mao Tokyo, JP 6 2
Inomata, Jun Tokyo, JP 6 37
Takei, Yoshinori Tsukuba, JP 11 62
Yoshida, Hajime Tsukuba, JP 136 1444

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