Gas flow estimation method, hole diameter estimation method, gas flow rate estimation device, and hole diameter estimation device
US12264949B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 16, 2020 |
| Grant date | Apr 1, 2025 |
| Priority date | — |
| Expiry date | Jul 12, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2113/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.