Numerical analysis of transient flow through a pipe orifice. 1st report, time constant for the settling flow

Toshiyuki Hayase; Cheng Ping; Satoru Hayashi

doi:10.1299/kikaib.59.1023

Numerical analysis of transient flow through a pipe orifice. 1st report, time constant for the settling flow

Toshiyuki Hayase, Cheng Ping, Satoru Hayashi

Research output: Contribution to journal › Article › peer-review

Abstract

As a fundamental consideration in hydraulic valve dynamics, transient flow through a pipe orifice has been studied via numerical analysis. Steady axisymmetric viscous fluid flow was first investigated to confirm the present SIMPLER-based finite volume methodology. Time-dependent calculation for a suddenly imposed pressure gradient has shown two distinct characteristic time constants for the transient state. The first characteristic time constant is commonly considered corresponding to the flow rate change, while the second one concerning the variation of flow structure has not been investigated in earlier studies. The final settling of the flow is established through the second characteristic time which is almost ten times larger than the first one for the present condition.

Original language	English
Pages (from-to)	1023-1029
Number of pages	7
Journal	Transactions of the Japan Society of Mechanical Engineers Series B
Volume	59
Issue number	560
DOIs	https://doi.org/10.1299/kikaib.59.1023
Publication status	Published - 1993
Externally published	Yes

Keywords

Computational Fluid Dynamics
Flow Meter
Fluid Power Systems
Fluid Transients
Pipe Orifice
Time Constant

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering

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10.1299/kikaib.59.1023

Cite this

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title = "Numerical analysis of transient flow through a pipe orifice. 1st report, time constant for the settling flow",

abstract = "As a fundamental consideration in hydraulic valve dynamics, transient flow through a pipe orifice has been studied via numerical analysis. Steady axisymmetric viscous fluid flow was first investigated to confirm the present SIMPLER-based finite volume methodology. Time-dependent calculation for a suddenly imposed pressure gradient has shown two distinct characteristic time constants for the transient state. The first characteristic time constant is commonly considered corresponding to the flow rate change, while the second one concerning the variation of flow structure has not been investigated in earlier studies. The final settling of the flow is established through the second characteristic time which is almost ten times larger than the first one for the present condition.",

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author = "Toshiyuki Hayase and Cheng Ping and Satoru Hayashi",

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doi = "10.1299/kikaib.59.1023",

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T1 - Numerical analysis of transient flow through a pipe orifice. 1st report, time constant for the settling flow

AU - Hayase, Toshiyuki

AU - Ping, Cheng

AU - Hayashi, Satoru

PY - 1993

Y1 - 1993

N2 - As a fundamental consideration in hydraulic valve dynamics, transient flow through a pipe orifice has been studied via numerical analysis. Steady axisymmetric viscous fluid flow was first investigated to confirm the present SIMPLER-based finite volume methodology. Time-dependent calculation for a suddenly imposed pressure gradient has shown two distinct characteristic time constants for the transient state. The first characteristic time constant is commonly considered corresponding to the flow rate change, while the second one concerning the variation of flow structure has not been investigated in earlier studies. The final settling of the flow is established through the second characteristic time which is almost ten times larger than the first one for the present condition.

AB - As a fundamental consideration in hydraulic valve dynamics, transient flow through a pipe orifice has been studied via numerical analysis. Steady axisymmetric viscous fluid flow was first investigated to confirm the present SIMPLER-based finite volume methodology. Time-dependent calculation for a suddenly imposed pressure gradient has shown two distinct characteristic time constants for the transient state. The first characteristic time constant is commonly considered corresponding to the flow rate change, while the second one concerning the variation of flow structure has not been investigated in earlier studies. The final settling of the flow is established through the second characteristic time which is almost ten times larger than the first one for the present condition.

KW - Computational Fluid Dynamics

KW - Flow Meter

KW - Fluid Power Systems

KW - Fluid Transients

KW - Pipe Orifice

KW - Time Constant

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JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

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ER -

Numerical analysis of transient flow through a pipe orifice. 1st report, time constant for the settling flow

Abstract

Keywords

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